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keep_hope_alive
02-13-2013, 12:49 AM
So you all know me for my preference for accurate musical reproduction (SQ).

I've helped with SPL focused competition vehicles over the years.

Now comes a hybrid for a long-time friend (25 years and counting). We'll call him "The Brian".

A van that will be SQ for most of the time and SPL for some of the time.

Equipment is as follows:
Head Unit: Clarion C500
Front Comps: JL Audio C5
Front Amp: Boston Acoustics GT-475
Sub: Fi 18BL
Sub Amp: Massive Audio N4
AGM battery up front, AGM battery rear, 1/0 wiring.

originally, the HU and comps are installed. I will redo them totally.
I put in a new amp rack and wired up the N4 already.
I loaned The Brian a sub (Vega 124) in an enclosure - one i normally use for my HT.

We have the 18BL.
The GT-475 is on it's way.

So, the first thing with a hybrid SPL vehicle is determining where the vehicle will peak - this can be mathematically determined or empirically determined. We did both.

Before we get into math, let's start with the testing (done last night).

I created a 20Hz-100Hz sweep with a total duration of 5 minutes.
I used TrueRTA, a ECM8000 mic, and a SoundDevices USBpre to measure response in real-time.
I placed the mic at the passenger windshield corner - isolated with foam.
I removed bass boost and EQ, and removed crossover and minimized subsonic filtering.
Using the HU, amp, and Vega124 in a "sealed" enclosure (vent was closed off) I played the sweep.
I measured peak SPL on the RTA in an insulated garage with a low noise floor.

I repeated the measurement with a few sub locations (both driver and passenger rear corners) - Magenta and Yellow lines.
I then removed the sub from the van, placed it on sawhorses, and measured the response near-field (1 meter) - Blue line.

The graphs below are the results:

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianVanSPLpeak.png

We can see the blue line follows the typical closed box response curve.
In the van, we get a peak at 45Hz.

neo_styles
02-13-2013, 12:55 AM
Glad to see you're using the GT475. I've been pretty happy with my 2125 so far and really hope more people get a chance to put these Bostons in their lineup before they aren't available any more.

keep_hope_alive
02-13-2013, 12:59 AM
Some of you may remember me talking about a concrete enclosure plan. This is that vehicle. But phase 1 will not be concrete. Instead, 1.5" to 2.25" thick enclosure walls. The enclosure will be a slanted front prism with a slot port tuned to 45Hz.

I'm working the enclosure plans up in Google SketchUp and AutoCAD. I'll share them soon.

Here are some quick pics of the current progress.

I'll make a beauty panel to cover up the amp rack

http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2012-11-26_02-23-33_560-4.jpg

rear battery is fused
http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2012-11-26_02-23-21_231-4.jpg

front battery is fused and big 3 grounding done
http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2012-12-02_20-58-59_877-4.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2012-12-02_21-01-52_602-4.jpg

the Fi 18BL
http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2012-10-17_15-40-41_553-5.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2012-10-27_21-53-35_390-5.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2012-10-27_21-54-04_520-5.jpg

keep_hope_alive
02-13-2013, 01:01 AM
Glad to see you're using the GT475. I've been pretty happy with my 2125 so far and really hope more people get a chance to put these Bostons in their lineup before they aren't available any more.

We almost went with the GT-2200. it's the same price right now (only $200!!!) and would be great for the front comps. But given the size of the van and The Brian wanting encompassing sound - we'll get some rear speakers in also and want them amplified.

keep_hope_alive
02-13-2013, 01:05 AM
Further, the van will be setup with removable baffles to turn everything rear of the C-pillars into a giant horn. This will alleviate a lot of concern with losses and flexing in the rear half of the van. I will have sketches of this as well.

neo_styles
02-13-2013, 01:06 AM
We almost went with the GT-2200. it's the same price right now (only $200!!!) and would be great for the front comps. But given the size of the van and The Brian wanting encompassing sound - we'll get some rear speakers in also and want them amplified.

Fair 'nuff. I've been trying to convince a couple people to go with the 275 or 475 as well who aren't able to have their speakers keep up with their subs. That 275 and the 2125 as well are just so small! The more I talk about this, the more I realize I need to start strapping cash away for another 2125. Especially since I'm having more and more trouble trying to eke out a more powerful midrange from the Kenwood I've got on speaker duty ATM.

Durango03
02-13-2013, 02:05 AM
In for the win!! KHA's work always leaves me in awe.. truely one of the best on CA

04murdalanche
02-13-2013, 02:20 AM
In for the win!! KHA's work always leaves me in awe.. truely one of the best on CA

SQ wise probably THE best.. looking forward to those CADs and sketches!

itsblown
02-14-2013, 12:02 AM
cant wait to see this

mlstrass
02-16-2013, 05:42 AM
Will this van be at any IL/WI/IN shows this year?

DB-Audio
02-16-2013, 07:01 AM
looks promising

keep_hope_alive
02-17-2013, 04:42 AM
i'm about halfway done cutting the wood for this design
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/WedgeDualPortEnclosurev3view2.png

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/WedgeDualPortEnclosurev3view4.png

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/WedgeDualPortEnclosurev3view3.png


longer section is tuned to 28Hz, the shorter section to 45Hz. Wood plugs will be used to switch between ports.

this is how my angles are coming out (the bottom two are the faceplates where the sub will mount). i'll have two layers on top (one more to the left).
http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2013-02-17_00-16-25_334.jpg

all using a circular saw and guide
http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2013-02-16_23-35-39_891.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2013-02-16_23-35-50_804.jpg

keep_hope_alive
02-17-2013, 04:45 AM
Will this van be at any IL/WI/IN shows this year?

I would like it to make it to Bloomington, IL on April 28th.

A buddy of his is having a local sound-off next Sunday. I don't think it'll be done setting up by then. i want to start gluing tomorrow, but we'll see.

I made the faceplate (where the sub mounts) shorter to make wood conservation work out (we have 48"x48" pieces of 3/4" MDF). originally i was looking at this layout where each port was side-by-side, but ran into a physical mounting conflict with sub depth
http://i38.photobucket.com/albums/e128/phat_funky_beats/DualVentWedge.png

mlstrass
02-17-2013, 05:14 AM
Not sure if I'm doing bloomington yet as that's a long haul. If I do make it down I'll be sure to look you up....

keep_hope_alive
02-17-2013, 11:57 AM
Not sure if I'm doing bloomington yet as that's a long haul. If I do make it down I'll be sure to look you up....

if there is anything around Chicago we may be down for making that trip as well.

keep_hope_alive
02-18-2013, 04:02 AM
modified design. i want the sub on the bottom. so i'm mirroring the front.

did a mock up this evening. still have port work to do.
http://i38.photobucket.com/albums/e128/phat_funky_beats/MobileUploads/2013-02-17_20-12-16_506.jpg

I need another 4x8 sheet of MDF. Two sheets in it so far, minimal scrap.

mlstrass
02-18-2013, 04:21 AM
if there is anything around Chicago we may be down for making that trip as well.

Usually have 4-5 around Hammond, IN. I'll be sure to post them up once they have dates....

subzero
04-23-2013, 04:22 AM
looks easy :D

keep_hope_alive
04-23-2013, 04:36 AM
making progress over time. got all of the pieces cut, and have started gluing the "bottom" which will be the side when placed in the van.

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianBox005.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130422_012552_665.jpg

then cut out the front baffle
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130422_233901_400.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130423_242502_507.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130423_244313_647.jpg

04murdalanche
04-24-2013, 12:19 PM
lookin good

Dirtrider4eva
04-24-2013, 12:52 PM
god dammm, im coing to you next time i want to do an enclosure, youre not too far off.

keep_hope_alive
04-24-2013, 02:58 PM
Thanks for the complements.

We still have a lot of work left. Besides gluing and bracing, i will be using resin and fiberglass at the seams and mounting location. then i expect to use bedliner for the exterior covering for both enhanced strength and protection. lots of work left.

tonight i think we'll insert t-nuts for woofer mounting, cut the hole for the 45Hz port and put t-nuts in there, and maybe glue the fronts and tops together. i think it will be better to glue the layers together before assembling them - so i can clamp them tighter.

seg_representin
04-26-2013, 01:39 PM
Thanks for the complements.

We still have a lot of work left. Besides gluing and bracing, i will be using resin and fiberglass at the seams and mounting location. then i expect to use bedliner for the exterior covering for both enhanced strength and protection. lots of work left.

tonight i think we'll insert t-nuts for woofer mounting, cut the hole for the 45Hz port and put t-nuts in there, and maybe glue the fronts and tops together. i think it will be better to glue the layers together before assembling them - so i can clamp them tighter.

Build looks good. Will you still be making the trip down to bloomington without the van?

keep_hope_alive
04-27-2013, 10:48 PM
Build looks good. Will you still be making the trip down to bloomington without the van?

sadly, no. my nieces are in a dance recital tomorrow and i have family in town. can't bail. i do work at the hospital in Bloomington though. So i'm there on a regular basis anymore. It's not that far, we make day trips.

i had wanted to be ready for that show. ah well, i'll hit the next one. family is more important.

hispls
04-27-2013, 10:59 PM
Why wouldn't you flush mount the sub? That generally gains AND looks nice.

keep_hope_alive
04-28-2013, 09:33 AM
Why wouldn't you flush mount the sub? That generally gains AND looks nice.

you may notice that the front will have a lot of seams. I will cover it all with another board, either 1/2 or 3/4" MDF. that will be routered at the port and sub and edges. that board will come later.

it's gotta look nice!

seg_representin
04-29-2013, 09:18 AM
sadly, no. my nieces are in a dance recital tomorrow and i have family in town. can't bail. i do work at the hospital in Bloomington though. So i'm there on a regular basis anymore. It's not that far, we make day trips.

i had wanted to be ready for that show. ah well, i'll hit the next one. family is more important.

Yeah family always comes first. I ended up not making it out there either and I'm from Peoria. Had too many things to do yesterday. Are there any shows up in the quad cities area?

keep_hope_alive
04-30-2013, 09:40 AM
Yeah family always comes first. I ended up not making it out there either and I'm from Peoria. Had too many things to do yesterday. Are there any shows up in the quad cities area?

there is a QC show at Mobile Wiring planned for late May. we want the van there. that is our goal. it will be ready. i will let you know.

i'm driving to Bloomington today, oddly enough.

Peoria, eh. I do a lot of work there also. How do you like Friar Tuck's Beverage?

seg_representin
04-30-2013, 11:50 AM
there is a QC show at Mobile Wiring planned for late May. we want the van there. that is our goal. it will be ready. i will let you know.

i'm driving to Bloomington today, oddly enough.

Peoria, eh. I do a lot of work there also. How do you like Friar Tuck's Beverage?

Yeah let me know about the show. Where do you do work in Peoria? I've only been to Friar Tucks one time for wine (for the gf) and it has a huge selection of wine and pretty much anything you want. I didn't look at the liquor prices to compare the prices, but it was more upscale than a binny's beverage depot.

NIHL8ION
04-30-2013, 12:01 PM
That looks awesome, you do very nice work :D

keep_hope_alive
04-30-2013, 10:10 PM
Yeah let me know about the show. Where do you do work in Peoria? I've only been to Friar Tucks one time for wine (for the gf) and it has a huge selection of wine and pretty much anything you want. I didn't look at the liquor prices to compare the prices, but it was more upscale than a binny's beverage depot.

as an Electrical Engineer I design electrical systems for hospitals and hospital campuses. I do a lot of work for OSF's campuses throughout IL. They are a great organization to work with and I really like them as a client. They are the type of client we hope to have.

The beer selection at Friar Tuck's is my reason for going.

mlstrass
05-01-2013, 02:44 AM
bloomington show was pretty lame, cops showed up within 5 minutes. Demo guys all left, but burp cars hung around.

When is the QC show as that's 3hrs for me, so I'd be down for that trip. I might hit up a Mobile Wiring show at Cordova this year, one of the Midnight Mayhem shows....

keep_hope_alive
05-04-2013, 10:13 PM
bloomington show was pretty lame, cops showed up within 5 minutes. Demo guys all left, but burp cars hung around.

When is the QC show as that's 3hrs for me, so I'd be down for that trip. I might hit up a Mobile Wiring show at Cordova this year, one of the Midnight Mayhem shows....

QC is just under 2 hrs from Peoria.

we will have the van at all of the Mobile Wiring shows this year (that's the plan anyway).

mlstrass
05-06-2013, 03:48 AM
QC is just under 2 hrs from Peoria.

we will have the van at all of the Mobile Wiring shows this year (that's the plan anyway).

Do you have a schedule for the mobile wiring shows?

TaylorFade
05-06-2013, 04:41 AM
EVERY single vehicle I have tested for resonance with the "sealed box trick" has shown 43-45hz. Every one of them. Be it a full size van or teeny tiny hatch.

I'm sure you're aware of this, but I figure it's worth mentioning.. normally, if you believe your resonance to be 45hz, you'd want to tune your SPL port 3-5hz below that. Although I don't personally put much stock into tuning for resonant frequency anyway.

Any reason you decided to go with that shape of box? And the port on the same plane as the sub?

I'm super curious to see the SPL numbers between the two ports. If I were a betting man (and I am), I'd bet that there won't be a heck of a lot of difference. And it wouldn't surprise me if the lower tuned one is actually louder.

Tuned in either way.

n8skow
05-06-2013, 01:39 PM
How are you identifing the resonance in the vehicles you've tested - by SPL meter or by an actual impedance plot?
The box(es) you are testing with - are they built to .707 alignments or other?



EVERY single vehicle I have tested for resonance with the "sealed box trick" has shown 43-45hz. Every one of them. Be it a full size van or teeny tiny hatch.

I'm sure you're aware of this, but I figure it's worth mentioning.. normally, if you believe your resonance to be 45hz, you'd want to tune your SPL port 3-5hz below that. Although I don't personally put much stock into tuning for resonant frequency anyway.

Any reason you decided to go with that shape of box? And the port on the same plane as the sub?

I'm super curious to see the SPL numbers between the two ports. If I were a betting man (and I am), I'd bet that there won't be a heck of a lot of difference. And it wouldn't surprise me if the lower tuned one is actually louder.

Tuned in either way.

seg_representin
05-06-2013, 01:55 PM
as an Electrical Engineer I design electrical systems for hospitals and hospital campuses. I do a lot of work for OSF's campuses throughout IL. They are a great organization to work with and I really like them as a client. They are the type of client we hope to have.

The beer selection at Friar Tuck's is my reason for going.

Yeah I have heard alot of great things about OSF in peoria. I am also a EE, but just getting to learn more things about the audio side of it. Would love to hear the van when you get it finished. I might do an sq build in my new car, but I haven't decided whether I want to tear it all apart since its my only car and I need it on a daily basis.

TaylorFade
05-06-2013, 07:59 PM
How are you identifing the resonance in the vehicles you've tested - by SPL meter or by an actual impedance plot?
The box(es) you are testing with - are they built to .707 alignments or other?

You don't need to align it to .707 if you do in-vehicle and anechoic. Although, if you know your alignment is, in fact, .707, you don't NEED to do the anechoic. In the past, when I cared to find it, I did in-vehicle SPL measurements and compared it to the anechoic. The largest desparity between the two is the point of the most "cabin gain".

If you do the math between say a hatch and a van, the difference between them is relatively small as far as sub bass wavelengths are concerned. For example... take 10ft for a hatch or whatever and even 20ft for a van, maybe. 1/4 wave of 10ft is 28hz. 1/4 wave for 20ft is half that, so 14hz. But both of those are too low for SPL purposes, so take the half wave. That's 56hz and 28hz. 56hz is lovely, but 28 is still too **** low. So take the full wave. Right back to 56hz. So seemingly... a hatch and van will both benefit from 56hz.

In my world, I'm much more concerned with tuning for impedance rise than "resonant frequency". The car is going to peak where it wants to. I can put a daily in my CRX and you'll see two distinct SPL peaks. One near tuning and one near where I know what the car wants. Regardless of tuning, I'll see that bump. The trick is not to force the note there, but to massage the impedence rise to it's lowest point at or near that note. That might be by tuning above that note. It may be on the nose. And I honetly can't tell you what my SPL boxes are "tuned" to because I don't tune them. I test them. It's tuned to where it's the loudest.

n8skow
05-06-2013, 10:40 PM
Interesting points...
It sounds like your objective is to get as much power as possible out of the amp though rather than the most efficiency?



You don't need to align it to .707 if you do in-vehicle and anechoic. Although, if you know your alignment is, in fact, .707, you don't NEED to do the anechoic. In the past, when I cared to find it, I did in-vehicle SPL measurements and compared it to the anechoic. The largest desparity between the two is the point of the most "cabin gain".

If you do the math between say a hatch and a van, the difference between them is relatively small as far as sub bass wavelengths are concerned. For example... take 10ft for a hatch or whatever and even 20ft for a van, maybe. 1/4 wave of 10ft is 28hz. 1/4 wave for 20ft is half that, so 14hz. But both of those are too low for SPL purposes, so take the half wave. That's 56hz and 28hz. 56hz is lovely, but 28 is still too **** low. So take the full wave. Right back to 56hz. So seemingly... a hatch and van will both benefit from 56hz.

In my world, I'm much more concerned with tuning for impedance rise than "resonant frequency". The car is going to peak where it wants to. I can put a daily in my CRX and you'll see two distinct SPL peaks. One near tuning and one near where I know what the car wants. Regardless of tuning, I'll see that bump. The trick is not to force the note there, but to massage the impedence rise to it's lowest point at or near that note. That might be by tuning above that note. It may be on the nose. And I honetly can't tell you what my SPL boxes are "tuned" to because I don't tune them. I test them. It's tuned to where it's the loudest.

TaylorFade
05-06-2013, 10:48 PM
Interesting points...
It sounds like your objective is to get as much power as possible out of the amp though rather than the most efficiency?

Well... it's USACi. Birthplace of the stupid 4ohm rating game and cheater amps. So I have to run the balls off of my amps. But most of my post would translate to other orgs. Especially the "test vs tune" part. IMO, people are far too concerned with the tuning of their SPL boxes.

I wish they'd go to a clamped format so I could stop buying USACi specific amps and wiring them down to .17 ohm.

It's all about testing and KHA knows this and has the chops to do the work and glean the important aspects of test results. I didnt' mean to derail his thread.

keep_hope_alive
05-07-2013, 02:13 PM
EVERY single vehicle I have tested for resonance with the "sealed box trick" has shown 43-45hz. Every one of them. Be it a full size van or teeny tiny hatch.

I'm sure you're aware of this, but I figure it's worth mentioning.. normally, if you believe your resonance to be 45hz, you'd want to tune your SPL port 3-5hz below that. Although I don't personally put much stock into tuning for resonant frequency anyway.

Any reason you decided to go with that shape of box? And the port on the same plane as the sub?

I'm super curious to see the SPL numbers between the two ports. If I were a betting man (and I am), I'd bet that there won't be a heck of a lot of difference. And it wouldn't surprise me if the lower tuned one is actually louder.

Tuned in either way.

i didn't post enclosure response curves (calculated) but the SPL tuning will burp louder at 45Hz (or so) than the SQ tuning.

I agree we want to operate the sub ABOVE the tuning frequency. that port will be removable and adjustable for post-construction adjustment.

the angle was on purpose, the end result will be a horn built into the rear of the van (and removable).

---------- Post added at 12:13 PM ---------- Previous post was at 12:12 PM ----------


Well... it's USACi. Birthplace of the stupid 4ohm rating game and cheater amps. So I have to run the balls off of my amps. But most of my post would translate to other orgs. Especially the "test vs tune" part. IMO, people are far too concerned with the tuning of their SPL boxes.

I wish they'd go to a clamped format so I could stop buying USACi specific amps and wiring them down to .17 ohm.

It's all about testing and KHA knows this and has the chops to do the work and glean the important aspects of test results. I didnt' mean to derail his thread.

no derail, this is on topic for the purpose of the build and your input is always welcome.

keep_hope_alive
05-17-2013, 09:42 AM
almost ready to close up the box. front will be three total layers. the middle layer has T-nuts.
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox002.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox004.jpg

the inside layer will help keep the t-nuts in place, and to mount flush i used a Forstner bit to carve out a recess for the t-nuts
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox001.jpg

glued, clamped, and screwed the middle layer
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox006.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox007.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox008.jpg

Then i made a center brace. all but one cut was done with a plunge router
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox011.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox012.jpg

test fit
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox013.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianbox015.jpg

keep_hope_alive
05-17-2013, 09:47 AM
next we'll wood glue the braces and then go over the inside seams with liquid nails.

i am still planning on making a 8x8 square port above the sub on the face of the box that will be tuned for 42Hz for 45Hz burps. But that will happen after I run the sub for a while in this configuration, the tuning will be around 27-28Hz given 72" of port area and 27-28" length.

The center brace happened the way it did because i needed a wall for the port anyway, then realized the enclosure was too big to go without a window brace.

hispls
05-17-2013, 10:08 AM
next we'll wood glue the braces and then go over the inside seams with liquid nails.

i am still planning on making a 8x8 square port above the sub on the face of the box that will be tuned for 42Hz for 45Hz burps. But that will happen after I run the sub for a while in this configuration, the tuning will be around 27-28Hz given 72" of port area and 27-28" length.

The center brace happened the way it did because i needed a wall for the port anyway, then realized the enclosure was too big to go without a window brace.

What do you call that thing that clamps down to the sheet of wood for a straight edge. Looks really handy, I'd order one if I knew what it was called so I could search for it.

keep_hope_alive
05-17-2013, 02:26 PM
What do you call that thing that clamps down to the sheet of wood for a straight edge. Looks really handy, I'd order one if I knew what it was called so I could search for it.

Buy 3-Piece BORA Clamp Edge Tool Guide Set at Woodcraft (http://www.woodcraft.com/product/2020556/29150/3piece-bora-clamp-edge-tool-guide-set.aspx)

straight edge clamping saw guide. like the ones above, except mine has guides to fit some saw bases and router bases so they run along the guide and you don't have to hold them in place as much. mine also has a ruler on both sides. three handle positions for adjustable pressure - can also be used to laminate boards together.

this is mine
Edge Clamping Tool Guide E. Emerson Co. C50 50-Inch All-In-One Straight on eBay! (http://compare.ebay.com/like/121106293231?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar)

Menards, Farm and Fleet, Lowe's, Home Depot, etc. all sell them. various lengths for 24", 48" or 84". basically let's your circular saw act like a panel saw.

keep_hope_alive
05-20-2013, 01:18 AM
progress this weekend..

box is assembled and sprayed inside and out with bedliner
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130518_162547_782.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130518_180708_609.jpg

while that was drying, we worked on the doors. while this is SPL capable, it will be an SQ daily.

factory
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130518_215146_518.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors002.jpg

used a Trunk kit of Stinker Roadkill Expert, 20 sf total, used about 8sf per door.

also did bags of 0.5mil PVC encased fiberglass batt insulation for sound absorption.

then covered the entire door with Stinger Overkill - this stuff was thick and heavy.

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130518_221553_391.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130518_220320_470.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors001.jpg

keep_hope_alive
05-20-2013, 01:18 AM
for the large holes, i had 3/4" UV treated birch that i wrapped in the factory closed cell foam sheeting. then screwed to the door, but located the wood on the inside. worked well.

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors011.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors003.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors004.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors015.jpg

both doors looked like this
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors018.jpg

foamed and sealed

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors006.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors019.jpg

keep_hope_alive
05-20-2013, 01:19 AM
JL C5 comps

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors008.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors009.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors010.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors020.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors021.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvandoors022.jpg

keep_hope_alive
05-20-2013, 01:24 AM
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvansub003.jpg

a beauty panel will follow shortly.

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvansub005.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvansub013.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvansub014.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvansub015.jpg

you may notice that we used a Grade 8 bolt to hold the seat belt clip to the box. this was extra insurance that the box wouldn't kill passengers. there are much larger Grade 8 bolts holding the box down to the floor, i can post this since no one would want to attempt to steal the box anyway and the time it takes to do so, you would be shot before you even got the sub out...

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvansub009.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvansub020.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/brianvansub021.jpg

she wangs hard.

collin.k
05-20-2013, 08:39 PM
well lets see then!

keep_hope_alive
05-20-2013, 10:55 PM
well lets see then!

videos and a DB Drags will be this weekend. we'll see. my goals for actual comp include a second port and enough boards to build a horn in the back of the van.

mlstrass
05-21-2013, 05:19 AM
what show and where this weekend?

keep_hope_alive
05-21-2013, 02:45 PM
what show and where this weekend?

Cordova, IL. This Friday, 11:30pm start. There is also a car show that is separate from the DB Drags event.

Last night we were hunting some loud rattles and found the jack/ramps/etc. were not secured. Also found a rear heater unit that was leaking coolant. so we had to pull half of the carpet up, which meant moving the box. I figured for the event we would want the box closer to the mic anyway, so we moved it here (still bolted for safety) - crappy phone pics at 3am.
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130521_031213_518.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130521_031206_846.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130521_031147_939.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130521_031136_222.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130521_031119_892.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130521_031104_684.jpg

passenger seat is reclined. the box is actually behind the B-pillars.

red13_69_84
05-22-2013, 04:12 AM
Know I haven't hit you up in awhile been busy at work... still planning on fri at cordova? I've never been to one yet and wouldn't mind tagging along for it or meeting with you guys somw time this week if you want.

mlstrass
05-22-2013, 04:35 AM
Fug, now I might have to make the trip out for Midnight Mayhem just to meet you.....

keep_hope_alive
05-22-2013, 05:39 AM
i put the oscilloscope on the amps tonight. unloaded, I got 46VAC out of the Massive N4 before clipping with HU at full volume and sub level on full. if it could sustain that at 1 ohm then 2116 W would be on tap. I don't expect to see that with an actual load.

the BA GT amp did ~35VAC when bridged, so around 300W bridged to the front comps.

musically, it sounds good, just that everything is low without T/A and low tweeters.

it's pretty loud, i have no idea what it will meter. i wanted to get a wall built but the other enclosure is eating up that time.

red13_69_84
05-22-2013, 06:10 PM
I get off at 8 if you want help

mlstrass
05-23-2013, 02:37 AM
Going for sure, so I'll look for the van. Looks like there will be a few set ups with 18's there....

keep_hope_alive
05-24-2013, 03:15 AM
I get off at 8 if you want help

FYI - this is a cool guy.

keep_hope_alive
05-24-2013, 03:18 AM
Going for sure, so I'll look for the van. Looks like there will be a few set ups with 18's there....

So, i may be a liar. The van owner may be unavailable and if he doesn't go, i probably won't. if you want to hang out sometime, just come over. we can talk shop and play with systems. i'll RTA anything.

we'll see...

mlstrass
05-27-2013, 06:13 AM
Bummer, didn't see the van so figured you weren't there. Gay purple minivan was mine.

LONG *** ride home, rained hard the first hundred miles, but cleared up for the last 100....

NIHL8ION
05-27-2013, 01:52 PM
Bummer, didn't see the van so figured you weren't there. Gay purple minivan was mine.

LONG *** ride home, rained hard the first hundred miles, but cleared up for the last 100....

lmao - I'd rock your "gay purple minivan" any day of the week :cool:

keep_hope_alive
05-27-2013, 11:51 PM
put a double din Kenwood in the van this weekend. it didn't fit, so custom mounts and some mods to the dash panel were required. i'd like to touch up the finished product but it was close enough for the evening.

in progress with wiring
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/astrovandash001.jpg

finished
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/astrovandash004.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/astrovandash007.jpg

next up - relocating amps... look at all this space
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/astrovandash006.jpg

keep_hope_alive
05-29-2013, 10:32 AM
pics from the truck box. built the box in under 6 hours over two days.
http://i38.photobucket.com/albums/e128/phat_funky_beats/IMG_5982.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/IMG_5984.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/IMG_5991.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/IMG_5989.jpg

amp location was temporary, about an hour of effort. i built a box for the caps.

the end results will be amps on top of the box with a cover to flush them up with caps under the box. a small seat will be added behind the driver's seat.
the box and cover will either be carpeted or painted blue to match the truck.

keep_hope_alive
06-22-2013, 10:52 PM
more progress late last night (10pm-5am)

got the amps moved, mounting boards cut and painted, wires ran. the factory panels will fit over these and completely hide the gear. as stealth as it gets.

the rockford 500x shown will be replaced with a Massive NX4. A total of 8 full range channels are available. Will likely run the front active with a 3-way (add a mid) then have speakers in the rear doors for outdoor parties and then a sound bar above the box for higher output. i'll have relays to switch configurations.

phone pics at 5 am will be replaced with better pics. i will also likely use split loom on all wiring once we finalize.
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130622_053359_447.jpg

rear battery is fused. connections are made between the rear and front battery fuses. a total of 3 fuse blocks are used. (1) ANL for the Massive N4. (2) MAXI are dedicated to the Ultracap bank that will be installed on the available space shown below. and another (2) MAXI for the 4 channel amps.
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130622_053344_759.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130622_053312_760.jpg

fuses will be accessible through removable rear cup holders and access. this is the Rocford that the NX4 will replace (location is sized for it)
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMG_20130622_053301_914.jpg

keep_hope_alive
06-24-2013, 02:46 AM
before:
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/astrovandash006.jpg

after:
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete001.jpg

connected the caps
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete003.jpg

insulated with CCF
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete006.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete007.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete005.jpg


http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete004.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete001.jpg

keep_hope_alive
06-24-2013, 02:48 AM
covering it up
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete008.jpg

fuses are accessible
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete009.jpg

through a removable controller
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete010.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete012.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete013.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete014.jpg


panels in place
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete011.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete017.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/BrianVanAmpComplete016.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/IMAG1316.jpg

subzero
06-24-2013, 02:58 AM
nice work!

keep_hope_alive
06-24-2013, 04:36 AM
i'll put some blue carpet in the middle pocket to hide the battery. some black fabric is there now to just reduce the visibility. turns out, i didn't need to cut out the pockets. i could have left them in place. i'll find a replacement panel in a salvage yard eventually. i did have to cut the middle pocket to clear the battery. carpet in the pocket will reduce rattles of anything in there anyway.

once the box is moved behind the driver's seat and the rear bench is in place, the amps are basically inaccessible, but fuses are always accessible.

knightrider2k6
06-28-2013, 06:24 PM
very nice!

keep_hope_alive
07-15-2013, 01:49 AM
i will have to change this from an SPL build to an SQ build.

we just ordered a pair of miniDSP's for 8 channels of processing. we will run 3-way active front.

i think the next show will be SQL and not SPL.

phemps
07-15-2013, 02:17 AM
Did you try the enclosure in horn formation?

keep_hope_alive
07-15-2013, 02:36 AM
Did you try the enclosure in horn formation?

nah, nice concept but not going to achieve the final goal.

we are moving the sub to behind the driver and then putting in framing for a removable wall to seal off behind the b-pillars. we will also get the rear bench seat back in for a total of 3 captain chairs and a bench.

phemps
07-15-2013, 02:39 AM
SQ wall:cool:

keep_hope_alive
07-15-2013, 03:10 AM
SQ wall:cool:

with the miniDSP's i think i can pull it off.

what we ordered tonight;

(2) 2in-4out miniDSP kits with the DC power isolator and USB cables/mounts.
(2) Vifa NE65W-04 2" midrange drivers. these will go in the factory tweeter locations (3" grill).
(1) DRemote for the Massive N4 - a remote amp gain knob
(1) remote for the Kenwood DDX-418 HU.
speaker wire, tie-downs, etc. as needed.

essentially, the van has 8 channels of amplification for speakers. we will use all 8 along with the mini-DSP's to do a 3-way active front stage and separately filtered rear. for $200 for both kits, it made much more sense than looking for an active crossover. Besides, the HU doesn't have time alignment and the van needs it.

should be fun.

Kikazz74
07-16-2013, 12:42 AM
Dang wish I could've seen the van first. but id be more than happy to come help however i can or do CAD drawings if you'd want them. i start working 12 hour days this wednesday the rest of the summer during the weeks so weekends are always free. we definitely have to take this to Midnight Mayhem. :)

This man does great work. absolutely awesome.

keep_hope_alive
07-16-2013, 02:47 PM
Dang wish I could've seen the van first. but id be more than happy to come help however i can or do CAD drawings if you'd want them. i start working 12 hour days this wednesday the rest of the summer during the weeks so weekends are always free. we definitely have to take this to Midnight Mayhem. :)

This man does great work. absolutely awesome.

you'll see the van soon enough. next few weekends are bad, but into August... i should have time on Saturday but traveling to a job site on Sunday to test some generators.

keep_hope_alive
09-03-2013, 09:53 AM
after a break during the heat wave, we are ready to move forward

mids that will go in doors in place of tweeters:
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/AccordVanProgress008.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/AccordVanProgress007.jpg

spheres for the JL tweeters
http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/AccordVanProgress009.jpg

http://i38.photobucket.com/albums/e128/phat_funky_beats/BrianAstroVan/AccordVanProgress010.jpg

collin.k
05-21-2014, 09:39 PM
you'll see the van soon enough. next few weekends are bad, but into August... i should have time on Saturday but traveling to a job site on Sunday to test some generators.

any updates?

keep_hope_alive
05-21-2014, 09:50 PM
any updates?

yea, owner had a kid and hasn't been over here in a while. i need to get over there and program the miniDSP.

oilstain
09-25-2014, 02:44 PM
KHA:
I'm looking into miniDSPs too. Are you concerned that they state they only handle max 2V input/output?
Did you go with miniDSP kits or miniDSP Balanced kits?

keep_hope_alive
09-30-2014, 03:57 AM
KHA:
I'm looking into miniDSPs too. Are you concerned that they state they only handle max 2V input/output?
Did you go with miniDSP kits or miniDSP Balanced kits?

not concerned with the 2V input limitation. the amps have the ability to work just fine at 2V, it just limits the max usable volume at the head unit.

i did not use balanced input modules because the RCA output isn't balanced.