PDA

View Full Version : Dual 10” 4th order Bandpass Build



rpfuror
01-28-2007, 05:13 PM
I have been playing around with designs, this one is a 4th order 3 chamber (2 separate sealed firing into a single vented chamber) bandpass designed around a set of 10” assassins.

Here are the specs:
S Value : 0.70
Gain : 2 dB
Fb : 52Hz
Passband :
Lower cutoff 32Hz
Upper cutoff 85Hz

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/3d001.jpg

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0066.jpg

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0067.jpg

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0068.jpg

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0069.jpg

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0070.jpg

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0071.jpg

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0072.jpg

More to come when it get a little warmer... Let me know what you think.

traksta15
01-28-2007, 05:20 PM
looks good-can't wait

Rage00
01-28-2007, 05:58 PM
subscribed!

Wonger
01-28-2007, 07:32 PM
I'll be watching this thread

rpfuror
01-28-2007, 08:16 PM
Here are a couple shots of the drivers:
http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0074.jpg

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0075.jpg

& a shot of the first sealed chambers face.

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0077.jpg

I'll let the glue dry tonight and work some more tomorrow.

evan
01-28-2007, 10:36 PM
Looks really good.

Why are you recessing the subs if they aren't going to be visible?

nismos14
01-28-2007, 10:45 PM
Excellent, can't wait for more pics!

mikey060
01-28-2007, 11:10 PM
Looks really good.

Why are you recessing the subs if they aren't going to be visible?

my guess would be less turbulance? lol but doesnt seem like it would be...since it is sealed anyways...

baseballer1100
01-28-2007, 11:12 PM
nice my friend real nice.

Calikid
01-28-2007, 11:14 PM
looking good, keep posting more pics please.

kicker06
01-28-2007, 11:16 PM
looks like good cuts.

nice box.

rpfuror
01-29-2007, 06:25 AM
Looks really good.

Why are you recessing the subs if they aren't going to be visible?

I am recessing the subs so that the net volume of the port area is not effected by the small mass of the drivers face. With them sitting flush it would have caused turbulance due to restriction volume in the vented area and would have caused the passband to change.

Also, I flipped the recess around to make it easier to place the driver, you will see in upcoming photos.

Team Hammer
01-29-2007, 09:00 AM
Nice detail and some thought went into it.

Are these going to be 180 degrees out a phase? Seems that they would cancel each other out firing that close at each other?

Let us know how it tunes out.

rpfuror
01-29-2007, 09:04 AM
I designed it around the drivers being in phase, but I will be giving area to change this internal when I start to test.

80INCHES
01-29-2007, 11:31 AM
nice build kep the pics commin

80

ultimate157
01-29-2007, 11:36 AM
Pretty obvious question, but in small bandpass enclosures, don't you have to destroy the box if you ever have/want to remove the subs?

Looks nice. More pics :yumyum:

rpfuror
01-29-2007, 11:43 AM
I am going to split the top of the box in 3 panels. 2 for the permanent sealed enclosure on each side and 1 for the vented area that will be screwed together and gasketed.

Team Hammer
01-29-2007, 12:15 PM
Without going back and looking, Would it not be easier to just remove the back panel and reseal that. That way your less to warp anything or produce leaks. You can make a small groove to keep everything in-line and tight.

rpfuror
01-29-2007, 12:22 PM
Right now the way it’s designed is to mount the sub thru the vented area. I want to make sure that the sealed portions stay sealed.

When I get more pictures up my logic I hope will be more apparent.

ffkk
01-30-2007, 07:17 AM
Looks great sofar! Did u use winisd, BBP or something else for the design?
And whats this box volumes?
Oh, and whats your pass band?

rpfuror
01-30-2007, 07:56 AM
Here are the specs:
S Value : 0.70
Gain : 2 dB
Fb : 52Hz
Passband :
Lower cutoff 32Hz
Upper cutoff 85Hz

I designed the box based off equations in the loud speaker design handbook and modeled it with an old school pencil and paper before I put it in 3d.

rpfuror
01-30-2007, 11:19 AM
Update:

Here is some more progression with the build.

This is the second face the port walls.

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0078.jpg

Mock up for placement of the faces

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0079.jpg

Rounded edges of the port walls

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0080.jpg

Port walls and 2nd face build

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0081.jpg

nismos14
01-30-2007, 11:29 AM
Maybe I should go bandpass too... SP12 can do that ...hmmm

Wkbdkid
01-30-2007, 11:34 AM
Looks good so far. Like how the box is setup.:thumbsup:

rpfuror
01-30-2007, 05:10 PM
Update:

Here is even more progression with the build.

Port Bend and wire inplace.

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0083.jpg

Port and Face Mockup

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0082.jpg

Port and Face in place with alot of "MDF glue" to seal up the lines.

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0084.jpg

I'm going to let the glue dry over night and then start sanding when I get a chance.

ffkk
01-31-2007, 03:05 AM
I designed the box based off equations in the loud speaker design handbook and modeled it with an old school pencil and paper before I put it in 3d.

Stoopid me, its in your first post! U got lots of clamps like the most installers. They are bloody expensive yet so handy. I guess its justified if you're an installer by saving on time and screws :D

so whats the volume of the front and rear chambers? I was interested in a design like this cos of my vehicle, but the size threw me off :crap:

SAG3
01-31-2007, 03:13 AM
Those are the worst D70 pics I have ever seen.

ffkk
01-31-2007, 03:40 AM
Those are the worst D70 pics I have ever seen.

Hey SAG, we have a franchise here called Kauai. Its a health food place. Dont really fancy it that much. Prefer fried chicken :naughty:

rpfuror
01-31-2007, 06:37 AM
Those are the worst D70 pics I have ever seen.

I think that wasin referance to my camera?

If so I just put it on auto, focus and snap. It does great work I try, but to interested in the build not realy much on the quality of the pics;).

If not nevermind.

ffkk
01-31-2007, 07:04 AM
your chamber volumes?

rpfuror
01-31-2007, 09:32 AM
I don't have the exact information with me but it is somewhere around .8 cu/ft on the sealed side and 1.3cu/ft on the vented @ 52 HZ. This will be 100% different for every driver and passband, so don't use it to base a design off of.

Skip01
01-31-2007, 03:39 PM
Sweet...loving the pics...flush mount when u dont see the sub...love it...as long as u know its there.

Prolly gonna be building somethin similar in a few weeks..keep the updates rolling

rpfuror
01-31-2007, 07:08 PM
Here is a pic of some resin I layed down to firm up the seals after cleaning up the "MDF glue" ... I'll put a couple more coat before I sand it down and do some painting...

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0086.jpg

ffkk
02-01-2007, 05:48 AM
I don't have the exact information with me but it is somewhere around .8 cu/ft on the sealed side and 1.3cu/ft on the vented @ 52 HZ. This will be 100% different for every driver and passband, so don't use it to base a design off of.


ofcos, I just wanted an idea of the size. so its around 3cuft!

rpfuror
02-01-2007, 08:58 AM
ofcos, I just wanted an idea of the size. so its around 3cuft!

Yeap, that’s about right.. It would have been much smaller if I decided to put both subs in the same chamber or ran them isobaric (that will be my nice design for my set of AA 8’s)

Flyhalf
02-01-2007, 09:02 AM
Ahh, so that's what you're doing with them. Sweet....

inapontiac
02-01-2007, 09:02 AM
godforbid that resin looks ugly. but other than that keep up the good work :)

rpfuror
02-01-2007, 09:17 AM
Ahh, so that's what you're doing with them. Sweet....

Yeap, I was just going to IM you about your box.


godforbid that resin looks ugly. but other than that keep up the good work :)

Really doesn’t have to be pretty, just needs to reinforce the wood some;)

After I test the design and see if I want to keep it, I might paint the inside and put a piece of fiberglass over the vented area so you can see the subs.

rpfuror
02-02-2007, 02:28 PM
Here are some more pics... the box is about complete. Just need to clean it up and in stall the drivers and the vents top panel.

Sealed box tops.

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0087.jpg

Front panel install.

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0088.jpg

nismos14
02-02-2007, 02:34 PM
Man that looks sweet..... Can't wait to hear how it sounds.

bholtmeier
02-02-2007, 07:02 PM
How do you get the subs out once the entire box is done? I've always wondered this.

rpfuror
02-02-2007, 08:48 PM
I split the top into 3 panels and the vented area (you will see in the next couple pics) will be screwed in and gasketed.

Spac3d
02-03-2007, 11:40 AM
Looks good! Let us know how it sounds.

rpfuror
02-10-2007, 11:42 AM
Haven't had time to post pictures. Here is the box about complete. I am building a "testing station" as my car is forsale so there is no wiring in it.

http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0089.jpg

Terminal (wired to 2 Ohm)
http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0090.jpg

Sub Placement 1
http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0091.jpg

Sub Placement 2
http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0092.jpg

Countersunk Top Panel
http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0093.jpg

Caulked Top
http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0094.jpg

Complete box ready for test.
http://i135.photobucket.com/albums/q145/rpfuror/4thOrder/DSC_0095.jpg

I'll let you know how it worked out when I get the station together.

l8r

nismos14
02-10-2007, 11:56 AM
Looks effing sweet!!!!!!

djman37
02-10-2007, 12:01 PM
looks good. subscribed for the results.

acold7dusta
02-10-2007, 12:12 PM
great build :)

rpfuror
02-10-2007, 04:05 PM
I got to test it a bit today… here are the results.

2 tests one in my studio and the other in my car.

Music,
Pink Floyd – Pulse Live (my go to for tuning, I know every beat in every song)

P Diddy – Diddy Rock & Akon – I Wanna Love You (These are my go to hip=hop songs right now, very even punchy bass @ 32-38Hz

Studio:

I connect the box to my carver 1500 watt PA amp and crossed it over @ 50 Hz. The high came from a set of active monitor speakers.

The box was loud, but it since it was in open space (about a 12x 20 ft room with 8ft ceiling) I really could hear it “hit” unless I had my head on the floor or walls. It did move a lot of air and vibrated everything that wasn’t bolted down.

Then,

I had to test it in the car:

The setup was not ideal. I had my high end running off an alpine deck and the box running off a saz-1500 amp.

I set the amp about half gain on both the bass boost and gain control, with the low pass crossover @ 75 Hz and subsonic @ 15Hz.

O My god!! At listening level on my highs ~volume 20 on the desk (couldn’t turn it up much higher because the high even would distort to much and I don’t want to blow the highs before I sell the car do I?) the box sounded amazing. Very accurate and deep, it really sounded like I put one high power 15” driver in the back… I was very impressed.

Now I am considering doing a full test buy installing 2 amps, 1 for the box and one for the highs and tuning it to see want the design can really do ;)

We will see, really depends on if someone comes get the vehicle soon ( I have a couple offers right now)

ffkk
02-11-2007, 03:12 AM
Wish I was there, instead of being in the office on a **** Sunday after I dunno how long :crying:

Well hopefully with the amp for the highs u should get the true output from the box.

Congrats is in order!

80INCHES
02-11-2007, 03:40 AM
kool beans
i'm glad the box is working out 4 u

80