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View Full Version : New 18" Fi BTL Design *PICS*



SHiZNiLTi
02-08-2007, 04:32 PM
6 cubes @ 28hz with 113 sq.in. of port

My goal here is to make a box that will really bring out the deep lows around 28-30hz.

I'll also be making rouned corners with resin in each corner of the box.

Can someone review this design for me to make sure everything checks out?

Outter Dims:
37 length x 26 width x 19 height

Port:
6.5 wide x 17.5 height x 30 long

http://img509.imageshack.us/img509/7808/frontfm1.jpg

http://img398.imageshack.us/img398/8758/frontanglegi0.jpg

http://img260.imageshack.us/img260/7212/topdv4.jpg

http://img378.imageshack.us/img378/2707/leftanglelp9.jpg

http://img185.imageshack.us/img185/7724/topangleuh2.jpg

Thanks!

azbass
02-08-2007, 04:34 PM
cool

baseballer1100
02-08-2007, 04:41 PM
Thats nice.

JoshHd6
02-08-2007, 04:53 PM
looks good..what amp do u have poowering it..

acold7dusta
02-08-2007, 04:55 PM
what happened with the other box?

SHiZNiLTi
02-08-2007, 05:01 PM
VX2200D that does 2250rms @ 1ohm, it does the job quit well as you can tell in this vid....

http://media.putfile.com/18--Fi-BTL

The above box in the video was 6.7 cubes @ 32hz with 100sq.in. of port, but seemed to be missing the lowend I was looking for. It gets hella loud and is insaine around 36-45hz range, but I want to try a box that focus's more on the lowend even if it means I will lose some DB's. I'm thinking this straight port and extra port area with lower tuning inconjuction with placement of sub on the box will get me what I'm looking for. Once this new box is built I will compare both design's and write up a review. The one I choose will get painted in black glossy mirror finish and will stay in my ride for a very long time.

squeak12
02-08-2007, 05:34 PM
So, what do you listen to that plays in the 28-30 range?

SHiZNiLTi
02-08-2007, 06:08 PM
So, what do you listen to that plays in the 28-30 range?
I only listen to a handfull of screwed songs that really focus on that frequency range, but I'm thinking this 28-29hz tuning will effect the way the bass sounds on other songs too, am I correct thinking this way?

Lets say a song doesnt have any 28-30hz bass, it only has 34-40hz bass in it, what kinda output will I expect to see from my sub? To my understanding and experiance it's still going to pound, but just sound deeper with less output then if it was tuned at 34hz right??

I met up with Tempe (http://www.caraudio.com/forum/member.php?u=15027) and heard his setup which is a 15" RE HC tuned to 29-30hz in a similar box as the one I've designed above and I personally thought it sounded good on a wide range of songs that we tested, it wasn't extremely loud for overall output on all songs but the sound quality was impressive overall..

Another thing to add is that I probably watch 2 movies over a time period of a week in blazer as I make my way to and from work, hence another reason for the lower tuning.

Also this is just a box to be compared to my 1st design (http://www.caraudio.com/forum/showthread.php?t=209355), I'm only keeping one box in the end.

Any other ideas on box design's will be greatly appreciated, post them up if you have them or just give me a detailed description?

sku
02-08-2007, 07:26 PM
Here's a simple thing to try...can you just plug up some port area/lengthen the port on your current box to lower its tuning?

To lengthen you'd add a bend to your current port.

To plug up the port area some foam (from HD) works quite welll.

This may save you the hassle of building a brand new box...

Also, if you really are going to tune that low you might think about aero ports or pluggable ports so that you can change the tuning...(in case you ever want to compete)...just some thoughts...

99gtxgolfer
02-08-2007, 07:31 PM
**** ;)

kickerlivinloud
02-08-2007, 07:40 PM
28Hz FTW!!!!!! You'll love the lows a box tuned that low will kick out!! Can't wait to see build pics!



Jon

matrxx dude
02-08-2007, 09:21 PM
whats up with the dude walking in the first pic.lol

SHiZNiLTi
02-08-2007, 09:27 PM
whats up with the dude walking in the first pic.lol
LOL, thats part of google sketchup. It's a actualy size reference, I did my box in feet not inches. Imagine if there was a box that big, that would be crazy. 37feet x 26 feet x 19feet

matrxx dude
02-08-2007, 09:28 PM
big *** box ftw

matrxx dude
02-08-2007, 09:32 PM
hers a pic of my little 18 and box.lol


http://i91.photobucket.com/albums/k292/livinlouder_2006/100_0401.jpg

SHiZNiLTi
02-08-2007, 09:35 PM
OMG thats a hella big port!!!

What are the dimensions of that port and of the box and whats teh tuning?

http://i91.photobucket.com/albums/k292/livinlouder_2006/100_0401.jpg

Chevyaudio
02-08-2007, 09:38 PM
You probably wont hear a difference man...unless you are listening to orchestral music, you arent dipping into the 20s.

matrxx dude
02-08-2007, 09:42 PM
OMG thats a hella big port!!!

What are the dimensions of that port and of the box and whats teh tuning?

http://i91.photobucket.com/albums/k292/livinlouder_2006/100_0401.jpg



the port area is 187sqin,tuning is at 36 hz,but peaks at 44hz on the term,only 3.5 cubes after displacement.

SHiZNiLTi
02-08-2007, 09:48 PM
Chevy, so tuning the box to 29hz and changing to a long straight port and adding 17sqi.in" more of port area wont really change the way the bass sounds regardless of what type of music I play?

What about keeping the same tuning I have now, but just changin over to this design with the straight port?

Here's the (2) designs....

http://img215.imageshack.us/img215/4585/964296884gi.jpg

http://img185.imageshack.us/img185/7724/topangleuh2.jpg

Wkbdkid
02-08-2007, 11:07 PM
I would try adding some length to the port wall to get the tunning to 28hz before making a whole new box and whatnot.

baseballer1100
02-08-2007, 11:31 PM
the port area is 187sqin,tuning is at 36 hz,but peaks at 44hz on the term,only 3.5 cubes after displacement.

Hows that for daily driving still musical?

SHiZNiLTi
02-08-2007, 11:45 PM
I would try adding some length to the port wall to get the tunning to 28hz before making a whole new box and whatnot.

I guess I can try that, but I don't think it's the fix I'm looking for.

Maybee this BTL just isn't made to hit the real low notes, My current box for my BTL is tuned at 31hz and it doesnt hit the lows like my old Type R 12's did which were tuned at 34hz in 5 cubes off of the same 2250rms amp. It just doesnt make sense. It's gotta be the design of the box. Any ideas guys?

squeak12
02-08-2007, 11:48 PM
I myself would try 7.5-8 cubes tuned to 32 if you have the room.

baseballer1100
02-08-2007, 11:51 PM
I guess I can try that, but I don't think it's the fix I'm looking for.

Maybee this BTL just isn't made to hit the real low notes, My current box for my BTL is tuned at 31hz and it doesnt hit the lows like my old Type R 12's did which were tuned at 34hz in 5 cubes off of the same 2250rms amp. It just doesnt make sense. It's gotta be the design of the box. Any ideas guys?

I had subs up port back? try that. It got real low.

ruger
02-08-2007, 11:56 PM
New 18" Fi BTL Design *PICS*

was thinking a new designed btl comming out already hehh.

nice box

TreyE
02-09-2007, 12:01 AM
yea build a bigger box thats ur problem...i had a 9 cube before box and it destroyed the lows tuned ~28-30

SHiZNiLTi
02-09-2007, 12:05 AM
I myself would try 7.5-8 cubes tuned to 32 if you have the room.
Ya I can go bigger, I'm at 37width 26 depth and 19 height. I can go from 19 height to 24 for height, that would get me to 7.5-8 cubes.

So you think a bigger box will help with the lowend output?


I had subs up port back? try that. It got real low.
LiL_KB showed me this design, It's sub up port back, I kinda want to go with a straight port since alot of experienced box builders say a straight port is the best type of port, but with my space this is the only way to do a CRX style box with proper tuning and port area.

It's 7 cubes @ 31 hz after sub displacement and 88.75 sq in of port 37 width, 26 depth and 21 height. Whatcha think, will this help more with the lowend I'm looking for?

http://i25.photobucket.com/albums/c81/Lil_KB/btl182-1.jpg

http://i25.photobucket.com/albums/c81/Lil_KB/btl181-1.jpg

One thing that worries me about this height and the sub up top is that the sub will be 8" away from where the roof and rear window meet. I'm going to take my current box and face it up this weekend to see how it sounds.

baseballer1100
02-09-2007, 12:11 AM
Ya I can go bigger, I'm at 37width 26 depth and 19 height. I can go from 19 height to 24 for height, that would get me to 7.5-8 cubes.

So you think a bigger box will help with the lowend output?


LiL_KB showed me this design, It's sub up port back, I kinda want to go with a straight port since alot of experienced box builders say a straight port is the best type of port, but with my space this is the only way to do a CRX style box with proper tuning and port area.

It's 7 cubes @ 31 hz after sub displacement and 88.75 sq in of port 37 width, 26 depth and 21 height. Whatcha think, will this help more with the lowend I'm looking for?

http://i25.photobucket.com/albums/c81/Lil_KB/btl182-1.jpg

http://i25.photobucket.com/albums/c81/Lil_KB/btl181-1.jpg

One thing that worries me about this height and the sub up top is that the sub will be 8" away from where the roof and rear window meet. I'm going to take my current box and face it up this weekend to see how it sounds.

Well mine did have a straight port i dont know how much that matters. but it was alot smaller i had like 12 maybe less cubes for my 2 18 inch btls... And that was off a us amps md2d at 1 ohm so like 1500 watts. Still managed to shake **** as shown here. http://i144.photobucket.com/albums/r178/baseballer2030/th_CIMG0869.jpg (http://s144.photobucket.com/albums/r178/baseballer2030/?action=view&current=CIMG0869.flv)

PhatTonyDeMarco
02-09-2007, 12:11 AM
Yeah you deffinitly want to go larger if you are trying to get more low-end extension.

My most recent build for my 18 in my Jeep was sub up and port back, exact enclosure as above, and it is the loudest setup I have owned.

32tl
02-09-2007, 12:13 AM
Nice vid, bro. If I'm not doin' anything this weekend I'll see if we can meet up. I'd definitely like to hear this *****.

SHiZNiLTi
02-09-2007, 12:18 AM
Nice Flex Vid!!!

I wish I lived close to a bunch of Fi BTL owners so we could all compare setups. Regardless I'm gonna make another box, I have the wood just waiting to be cut in my garage. The question is which design. I'll definatly go bigger because I don't see that making the box will will do anythign but help with what I'm trying to accomplish.

baseballer1100
02-09-2007, 12:18 AM
Woot. Yeah dude no one around me has btls. Not that its a bad thing. :)

SHiZNiLTi
02-09-2007, 12:20 AM
Nice vid, bro. If I'm not doin' anything this weekend I'll see if we can meet up. I'd definitely like to hear this *****.
For Sure 32tl, lol i allready forgot your real name shortly after I called you. Maybee Sunday we can meet up, you can post your opinion here after you hear it.

JoshHd6
02-09-2007, 05:28 PM
Woot. Yeah dude no one around me has btls. Not that its a bad thing. :)


ehhhh..i might be gettin 4 18s for the yukon...:D

































sike..maybe juss 1 15 btl...how much louder was the btl compared to the Rs..

JoshHd6
02-09-2007, 09:16 PM
updates?..lol..^^answer that question..

SHiZNiLTi
02-11-2007, 02:24 AM
Master467, the BTL is much louder then my old type R's with using the same 2250 rms amp on each. The reason why I say it's louder is because my BTL flex's my vehicle way more and I can actually see my windshield wipers bounce and they never did that with the R's. Another comparision is when Im driving back home from work I pass by this chop shop that has a few trick rides outside of it that have alarms. I know they have alarms because I've talked to the guys that work there when i had the R's and made a few of there alarms go of while I was parked a few feet from them in the parking lot. Anyways when I drive by them on my way home Im about 3 lanes over and the R's would never make there alarms go off while doing a 40mph drive by 3 lanes over. Now when I drive by 3 lanes over at 40mph I make all 3 of there alarms go off.

I'll do an actual video comparison soon.

JoshHd6
02-11-2007, 02:26 AM
Master467, the BTL is much louder then my old type R's with using the same 2250 rms amp on each. The reason why I say it's louder is because my BTL flex's my vehicle way more and I can actually see my windshield wipers bounce and they never did that with the R's. Another comparision is when Im driving back home from work I pass by this chop shop that has a few trick rides outside of it that have alarms. I know they have alarms because I've talked to the guys that work there when i had the R's and made a few of there alarms go of while I was parked a few feet from them in the parking lot. Anyways when I drive by them on my way home Im about 3 lanes over and the R's would never make there alarms go off while doing a 40mph drive by 3 lanes over. Now when I drive by 3 lanes over at 40mph I make all 3 of there alarms go off.

I'll do an actual video comparison soon.

YAY..i say u do it..and how is that planet audio 2250..i might buy this guys on here...:D

SHiZNiLTi
02-11-2007, 02:46 AM
The Planet Audio PA2250D / VX2200D is a great amp for the BTL IMO. For a 15" BTL it's perfect match. As you can see from my excursion vid it's really pushing my 18 pretty good, but it probabaly could take a lil more for daily driving. Overall it's hard to find any other amp that does over 2000rms for well under $300.

bamaboy
02-11-2007, 10:59 AM
big box tuned low has more lowend than a smaller one, try 7-8cubes or more if you can fit it

BTL's arnt going to rule the lowend dept i wouldnt think

also where is you SS filter at on your amp? try lowering it a little and see, i remember my A3000s were weird with that, the lines didnt match up with the numbers really on the SS, so i just tried to set it by ear somewhere close

baseballer1100
02-11-2007, 06:05 PM
big box tuned low has more lowend than a smaller one, try 7-8cubes or more if you can fit it

BTL's arnt going to rule the lowend dept i wouldnt think

also where is you SS filter at on your amp? try lowering it a little and see, i remember my A3000s were weird with that, the lines didnt match up with the numbers really on the SS, so i just tried to set it by ear somewhere close

youd be surprised...

Goldtaz1
02-12-2007, 11:31 AM
youd be surprised...

x2!

galacticmonkey
02-12-2007, 11:49 AM
BTLs werent built to be low end woofers... They are straight SPL woofers adapted a bit to be a good daily driver sub.

If you're looking for the crazy low-end, look into some high end TC sounds subs, or the new 06 XXXs.

For a more low end, musical box, id say check into something like 8 cubes @ 30hz with about 100 sq in of port.

SHiZNiLTi
02-12-2007, 12:39 PM
BTLs werent built to be low end woofers... They are straight SPL woofers adapted a bit to be a good daily driver sub.

If you're looking for the crazy low-end, look into some high end TC sounds subs, or the new 06 XXXs.

For a more low end, musical box, id say check into something like 8 cubes @ 30hz with about 100 sq in of port.
Very good advice, I agree with you 100%. The BTL gets hella loud, but wasnt made for crazy low-end, although it still sounds pretty good for a SPL sub. I'm ok with this because my main goal was to get louder then my type R 12's that were in 5 cubes @ 34hz which were powered off the same 2250rms amp. I accomplished this goal by a longshot so I'm very content and happy with my upgrade to the BTL.

Since I still have about a sheet and a half of mdf left I want to build another box just to see what the BTL sounds like in a larger box then my current which is 6.7cubes after sub and port...

My final decision on the second box is gonna be 8 cubes @ 31hz with 110sq.in. of port in a CRX style design with sub up and port back. I'll design the box so the port will be about 4" away from the rear hatch.

Either that or I'm gonna wall of the entire rear hatch area and have sub and port forward.

sku
02-12-2007, 09:15 PM
Very good advice, I agree with you 100%. The BTL gets hella loud, but wasnt made for crazy low-end, although it still sounds pretty good for a SPL sub. I'm ok with this because my main goal was to get louder then my type R 12's that were in 5 cubes @ 34hz which were powered off the same 2250rms amp. I accomplished this goal by a longshot so I'm very content and happy with my upgrade to the BTL.

Since I still have about a sheet and a half of mdf left I want to build another box just to see what the BTL sounds like in a larger box then my current which is 6.7cubes after sub and port...

My final decision on the second box is gonna be 8 cubes @ 31hz with 110sq.in. of port in a CRX style design with sub up and port back. I'll design the box so the port will be about 4" away from the rear hatch.

Either that or I'm gonna wall of the entire rear hatch area and have sub and port forward.

Hmm...after some extensive port area reduction testing, this last weekend, I would say if you're going for deep bass that 30hz with the *most* port area you can afford is your best bet...

I reduced port area by about 10 sq. inches for each session and re-tested...

My port is 5 x 20 -- the foam plug was 2 inches thick...so for example the first reduction made it a 5 x 18 port, then 5 x16, and so on...

Too bad you don't have a meter...you can tell exactly where you gains are occurring after your new box...

squeak12
02-12-2007, 09:18 PM
Id do sub up and port up with the port against the hatch covering the width of the box. Or maybe even sub forward port up.

Lil_KB
02-13-2007, 09:03 AM
answer your PMs bro...:up2somet:

can't believe you're making another box already.