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View Full Version : 2 Kicker 15" L7s.. In A Civic Hatch.. I wanna do this right..



Pimpdaddyq
12-31-2009, 04:20 AM
alright.. im about to do a build for a buddy for his early 90s civic hatchback..

2 Kicker L7 15s, off a Hifonics Bxi2610D.. Should get loud.. its what he wants, so whatever.. BUT for the box..

I wanna make sure this is perfect.. I have a 34x34x20 space to work with.. could go a bit deeper i guess.. but thats about the extent of it.. I want to see what you guys think for the box.. where subs should face, port size, etc..

I was gonna do subs and port on same plane, big slot across the top, he could turn box towards the hatch or front, whatever he prefers, and should get loud.. I want to do an interchangable port, one for lows, one tuned slightly higher for the mic (wants to compete in local comps).. Any input is Greatly appreciated.. Thanks guys..

Happy Holidays, Have a safe new years fellas..

SicAudio
12-31-2009, 04:30 AM
tune it between 35-38 and port back subs up
i just did 2 12" brutus squares an 2450 rms in an acura hatch and he can do small hair tricks on music :) big 1's on tones really easily
dextermoped in my sig :) he even helped with the install.
he will be posting a build log soon.

Pimpdaddyq
12-31-2009, 04:40 AM
You think itll be louder then sub and port back? Im not doubting you.. as in SUVs ive done the same.. but elaborate on what you think. I appreciate it man..

SicAudio
12-31-2009, 04:43 AM
the subs compress of the glass the port back give it time to develop the sound wave subs waves are way slower than highs so it takes more distance for the sound to develop.

Pimpdaddyq
12-31-2009, 04:47 AM
Alright.. I think imma try subs up port back.. With that said.. What about port area, and sub placement.. subs all the way up to the front seats? And I wanna do one chamber braced to hell.. port area fro roughly 10cubes after disp. tuned to ~32, and tuned higher for comps..

SicAudio
12-31-2009, 04:49 AM
somewher close to the middle of the box but closer to the seat than the rear.

120-140 sq " of port and tune at 35-38 they **** below 35 they dont get real low.

Pimpdaddyq
12-31-2009, 04:54 AM
Yea.. Last time i did 2 L7s in a blazer and tuned em at 36 and it hit low and high, but the kid was happy with it.. Thanks man.. Imma try n do a build log although its not that big..

satchel50207
12-31-2009, 04:56 AM
my 12" L7 got pretty low tuned at 37Hz but when i tuned it to 32Hz it lost all its deep bass. so i would reccomend something around 37Hz. i did a slot port box. i got a prefab tuned at 34Hz and it ****** ***. i wasn't pleased with my numbers on two 12" L7's either

SSS 18734
12-31-2009, 05:55 AM
the subs compress of the glass the port back give it time to develop the sound wave subs waves are way slower than highs so it takes more distance for the sound to develop.

*smacks head on table*

All frequencies travel at the same speed, all other factors left equal.

justafifteen
12-31-2009, 02:53 PM
*smacks head on table*

All frequencies travel at the same speed, all other factors left equal.

Chemistry 101 :crap:

SicAudio
12-31-2009, 03:07 PM
the subs compress of the glass the port back give it time to develop the sound wave subs waves are way slower than highs so it takes more distance for the sound to develop.

never said the speed of the sound changes dude i said the wavelength learn to read :)


Sound energy is transmitted through air (or other particles) as a traveling pressure wave. In air the displacement wave amplitude may range from 10-7 mm to a few mm per second.

Frequency
The frequency - cycles per second - of a sound is expressed in hertz - Hz. The frequency can be expressed as

f = 1 / T (1)

where

f = frequency (s-1, Hz)

T = time for completing one cycle (s)

Example - Frequency
The time for completing one cycle for a 500 Hz tone can be calculated using (1) as

T = 1 / (500 Hz)

= 0.002 s

The range for human hearing is 20 to 20.000 Hz. By age 12-13.000 Hz are the upper limit for many people.

Wavelength
The wavelength of sound is the distance between analogous points of two successive waves.



λ = c / f (2)

where

λ = wavelength (m)

c = speed of sound (m/s)

f = frequency (s-1, Hz)

Example - the Wavelength of a Tone
In air at normal atmosphere at 0 oC the speed of sound is 331.2 m/s. The wavelength of a 500 Hz tone can be calculated as:

λ = (331.2 m/s) / (500 Hz)

= 0.662 m

CRXBMPN
12-31-2009, 03:10 PM
i've seen subs up ports up in this specific vehicle be loudest.

SicAudio
12-31-2009, 03:12 PM
almost every LOUD crx and civic has them up and back from what i remember.

CRXBMPN
12-31-2009, 03:14 PM
thx, i've had three crx's and in those a crx style box worked best... two 15's idk if he has enough width to make a mid box port, maybe across the entire back of the box firing up, or hey ports back really cant hurt after all, it wont be all that much of a diff either way imho.... could always do subs forward ports back :confused: thats the new standard for crx's now-a-days

AudioXtremes
12-31-2009, 03:46 PM
Civic hatch likes sub up port back for sure. You may get good results with other configurations but this is what I would do. It also likes sub forward port back if you get the subs close to b pillar.

AudioXtremes
12-31-2009, 03:47 PM
Also don't make the box too tall and leave 6-8" from hatch.

SicAudio
12-31-2009, 03:50 PM
yuppers :)

murderedtahoe
12-31-2009, 03:52 PM
somewher close to the middle of the box but closer to the seat than the rear.

120-140 sq " of port and tune at 35-38 they **** below 35 they dont get real low.

are you freaking serious? do you have any experience with them at all? i had mines @ 26hz and they murdered the lows. my install the higher bass40hz+ ******. its all in the box man. then again if its not hifonics its not the best right?

murderedtahoe
12-31-2009, 03:57 PM
http://i55.photobucket.com/albums/g159/oriontahoe/615s2.jpg

not pretty at all but it got the job done and destroyed y truck to bits.

AudioXtremes
12-31-2009, 04:00 PM
Yeah well six subs have an advantage over 2 for the lows.

murderedtahoe
12-31-2009, 04:02 PM
i only had 4 hooked up notice the 2 in middle were directly over the port? but 4 still has an advantage too

SicAudio
12-31-2009, 04:06 PM
i have 20 yrs experience with Kicker i am still a kicker dealer as well :)
look at the fs of the sub. if you really think at 26hz they were all that then you don't know jackshit about kicker dude lol

the fs is 26 so to keep them from bottoming or trashing the weak suspension tune 10-15hz higher
http://www.kicker.com/sites/default/files/SoloBaricL72008.pdf
theres the sub specs now call and ask kicker what they recommend :) 35-38 Hz
their are 1000's of threads that also verify that they have horrible muddy lows when tuned low as well.

AudioXtremes
12-31-2009, 04:11 PM
Yes I noticed the subs in the port I just thought you were dumb.

I would tune them 34-38hz for a nice balance.

Pimpdaddyq
01-02-2010, 12:02 AM
Its so cold here in Iowa the next few days I might slack on startin it.. I'm gonna do subs up port back.. Probably around 36-37hz, possibly gonna try doing an interchangeable port for daily and local shows..

A lot of help guys I appreciate it.. Gonna be loud for sure in that small car.. Any other tips would be greatly appreciated.. Thanks again guys..

Pimpdaddyq
01-09-2010, 06:07 AM
Looks like ive got 34 wide by 38 deep by 15 tall.. comes out to 11.2cubes.. was going to do a 4x32.5 port towards the hatch and it calls for around 20" long.. what do you guys think?

iamamp3pimp
01-09-2010, 06:45 AM
yeah thats actually 9.26 cubes internal before any displacements.

if its a design you are looking for hit me up, i have some a bit of work for these subs.

-Robin

Highs on bass
01-09-2010, 07:12 AM
http://i55.photobucket.com/albums/g159/oriontahoe/615s2.jpg

not pretty at all but it got the job done and destroyed y truck to bits.

I would love to see this in person, Do you still have this setup? also lmk when you wanna unload one of those ap amps!!! i need a second one.

Now let me ask you another question, Do you really have a sub firing down into your port? Honestly that is pointless as hell, AND if you are feeding it decent power you will blow it. Because thats literally FREE AIR.

csu87
01-09-2010, 07:18 AM
]i only had 4 hooked up notice the 2 in middle were directly over the port[/B]? but 4 still has an advantage too


I would love to see this in person, Do you still have this setup? also lmk when you wanna unload one of those ap amps!!! i need a second one.

Now let me ask you another question, Do you really have a sub firing down into your port? Honestly that is pointless as hell, AND if you are feeding it decent power you will blow it. Because thats literally FREE AIR.

read much?

iamamp3pimp
01-09-2010, 11:02 AM
I would love to see this in person, Do you still have this setup? also lmk when you wanna unload one of those ap amps!!! i need a second one.

Now let me ask you another question, Do you really have a sub firing down into your port? Honestly that is pointless as hell, AND if you are feeding it decent power you will blow it. Because thats literally FREE AIR.
if you cant tell that port has a top wall that is right in front of the sub



not that i think it would work anyway....

Highs on bass
01-09-2010, 04:53 PM
sry just saw that. but yean so the sub is basicly in a ported box that has all of an inch of airspace infront of it.... wouldn't work. why waste money on 2 extra subs. when they are only making a patch to some extra holes you cut out.

05_ZX636
01-09-2010, 05:56 PM
i had 95 hatchback civic with 2 l7 15's in 8 cubes tuned to 33hz with subs up and port back. The port was running on the bottom of box all across, was real loud and had 2 mtx 81000d's on them