10" sub under the seat? Yes! Pics inside!

rxer311 · 10-13-2009, 04:21 PM

Some of you may remember from about a month ago my project to lighten my car but still have decent audio. First I installed the Pioneer TSD1720 components and moved my Alpine amp from my trunk to under the driver's seat. The midrange output of the components was great but my music was still lacking and I decided that I still wanted a sub. I got rid of my 12" sub in the trunk that weighed almost 40lbs! So what was I to do?

Some people on here helped me with some ideas from a passthrough box to an underseat box on the passenger side. I finally settled on underseat. It would be a lower center of gravity under there anyway. I looked at 6.5" shallow mounts and 8" shallow mounts and almost went with the pioneer 8" shallow mount. I wanted more though! I looked at every 10" shallow mount woofer but they all required 0.4 cubic feet of box space which is way too big for under a seat. What good is a shallow mount sub if you need a crapload of space to run the speaker anyway?

I finally found this solution after some people on here told me to go with an eD 6.5" sub.

This sub is the eD SQ-10 subwoofer. http://www.edesignaudio.com/product_...roducts_id=106

While they were at it I had them build me a custom box to these specs.

First I think I will need 1/2" material to get enough volume and then use fiber fill to stuff it.

A - 5"

B - 11.5"

C - 14.5"

D - 3.5"

If you visualize this the box slopes.

Anyway, here all the installed pics.

Best of all it weighs only 18lbs and has a much lower center of gravity than in the trunk. Its also easy for my to remove for autocrosses.

If you are thinking about this call Brett at http://www.edesignaudio.com/contact.php and ask him for an STi underseat box.

Thanks for looking

* Registered users of the site do not see these ads.

OAKOS Automotive · 10-13-2009, 04:30 PM

Nice! My 2.5rs has the factory underseat sub!

Bart
OAKOS Automotive

djerickd · 10-13-2009, 04:40 PM

whoa I bet ur GF loves that!!

Giganticprune · 10-13-2009, 04:44 PM

no carpet? :\

XanRules · 10-13-2009, 04:45 PM

which alpine amp do you have? I was worried about mounting mine under the seat because apparently they get really hot.

rxer311 · 10-13-2009, 05:17 PM

Quote:

Originally Posted by Giganticprune

no carpet? :\

Carpet adds weight

I may paint it black some day.

rxer311 · 10-13-2009, 05:19 PM

I have an alpine f-450 amp. It does get hot. Best way to do it is put it on "feet". Pretty much mount each corner to a 1/2" peice of plywood or similar. That keeps it off the floor to help with cooling. Also there are air vents under your seat (when you put the switch to the feet position). If it gets hot...crank the A/C on it!

rxer311 · 10-13-2009, 05:20 PM

Quote:

Originally Posted by djerickd

whoa I bet ur GF loves that!!

The wife hasn't ridden in the car with the new sub yet

.

djerickd · 10-13-2009, 05:22 PM

u will have to surprise her!

rxer311 · 10-13-2009, 05:27 PM

By the way there is only 75watts going to this thing and it sounds better than the crappy MA audio 12" sub I had in my trunk with 150 watts going to it. I was pleasantly suprised at how well it works. It is very well balanced with the components I have. I actually have the subwoofer turned down right now.

XanRules · 10-13-2009, 05:31 PM

I've got an Alpine...something. 250?
It's nailed on my back seat right now.
Not literally nailed. But whatever.

jarencibia · 10-13-2009, 06:30 PM

Awesome! I may have to copy your idea....

mr_hann · 10-13-2009, 06:46 PM

Does the sub hit the seat at all (ie can you still move the seat back and forth)?

And do you happen to have a shot from the side?

Your idea has sold me.

AcquaCow · 10-13-2009, 06:46 PM

STi seats?

I wonder if Rick has any more of his fiberglass/wood STi underseat sub boxes?

I actually have two eD 6.5"s in my car and I did test fit and noticed they fit under the passenger seat just fine... almost broke out the fiberglass and started building a mold of the floor/chair rails on the spot

I do plan to disassemble a wrx seat some day soon to steal the rails from it and use them to template a box using all of the air volume available under the seat...

-- Dave

Back Road Runner · 10-13-2009, 06:49 PM

...but...but...that's where my amps go.

Nice job. That's one benefit of the low Qts sub designs ED makes, tiny boxes.

rxer311 · 10-13-2009, 06:58 PM

Quote:

Originally Posted by mr_hann

Does the sub hit the seat at all (ie can you still move the seat back and forth)?

And do you happen to have a shot from the side?

Your idea has sold me.

With the box at this size the seat moves freely. You can pull the sub in and out. If I did it over again I would probably make it a 1/2"-1" shorter in length (if you stuff it with fiber fill you should still have enough volume). I love it though. Sorry no side shots right now. If I take it out again I will take more pics.

labcoat · 10-13-2009, 07:01 PM

rxer311

Looks good paint the box, a few coats of rattle can black and you would be surprised how it just completely disappear.

I'm glad this worked out for you.

R-

rxer311 · 10-13-2009, 10:04 PM

Quote:

Originally Posted by labcoat

rxer311

Looks good paint the box, a few coats of rattle can black and you would be surprised how it just completely disappear.

I'm glad this worked out for you.

R-

Thanks for all the help

Audiosavvy · 10-13-2009, 10:08 PM

Quote:

Originally Posted by XanRules

which alpine amp do you have? I was worried about mounting mine under the seat because apparently they get really hot.

Alpine amps certainly don't get excessively hot. The PDX amps are the hottest-running of theirs that I'm familiar with (think power per sq. inch) and mine run FIIIINE under the seats. Keep in mind that they share the same climate as you, as opposed to the trunk, so are going to remain cooler under there than in the trunk

couchflambeau · 10-14-2009, 01:55 PM

You're concerned about the weight of carpet but built an MDF box... (penny-wise/pound foolish??)

Fiberglass FTW... save weight AND space...

STiML8 · 10-14-2009, 02:23 PM

How much did it cost u?

JC · 10-14-2009, 02:58 PM

Quote:

Originally Posted by Audiosavvy

Alpine amps certainly don't get excessively hot. The PDX amps are the hottest-running of theirs that I'm familiar with (think power per sq. inch) and mine run FIIIINE under the seats. Keep in mind that they share the same climate as you, as opposed to the trunk, so are going to remain cooler under there than in the trunk

I definitely don't think PDXs are their hottest running amps. They are Class D so they should run cooler than most Class A/B amps. I have a PDX-5 under the seat of my EVO and I drove ~8hrs with the stereo loud and the amp was still cool to the touch. I do have small AC vents under there, so that probably helped.

b00st3d · 10-14-2009, 03:08 PM

Quote:

First I think I will need 1/2" material to get enough volume and then use fiber fill to stuff it.
A - 5"
B - 11.5"
C - 14.5"
D - 3.5"

what do those sizes and letters correspond to?

labcoat · 10-14-2009, 03:14 PM

Quote:

Originally Posted by b00st3d

what do those sizes and letters correspond to?

Search is your friend.

http://forums.nasioc.com/forums/show....php?t=1837426

noktrnal1 · 10-14-2009, 03:20 PM

Thats pretty sweet, I'd heard the factory sub wasn't much to speak of so I wanted to do a little something more. Thanks for the info and pics.

10-13-2009, 04:21 PM	#1
rxer311 Scooby Specialist Member#: 107099 Join Date: Feb 2006 Chapter/Region: Tri-State Location: Lancaster, PA Vehicle: '07 STI Satin White Pearl	10" sub under the seat? Yes! Pics inside! Some of you may remember from about a month ago my project to lighten my car but still have decent audio. First I installed the Pioneer TSD1720 components and moved my Alpine amp from my trunk to under the driver's seat. The midrange output of the components was great but my music was still lacking and I decided that I still wanted a sub. I got rid of my 12" sub in the trunk that weighed almost 40lbs! So what was I to do? Some people on here helped me with some ideas from a passthrough box to an underseat box on the passenger side. I finally settled on underseat. It would be a lower center of gravity under there anyway. I looked at 6.5" shallow mounts and 8" shallow mounts and almost went with the pioneer 8" shallow mount. I wanted more though! I looked at every 10" shallow mount woofer but they all required 0.4 cubic feet of box space which is way too big for under a seat. What good is a shallow mount sub if you need a crapload of space to run the speaker anyway? I finally found this solution after some people on here told me to go with an eD 6.5" sub. This sub is the eD SQ-10 subwoofer. http://www.edesignaudio.com/product_...roducts_id=106 While they were at it I had them build me a custom box to these specs. First I think I will need 1/2" material to get enough volume and then use fiber fill to stuff it. A - 5" B - 11.5" C - 14.5" D - 3.5" If you visualize this the box slopes. Anyway, here all the installed pics. Best of all it weighs only 18lbs and has a much lower center of gravity than in the trunk. Its also easy for my to remove for autocrosses. If you are thinking about this call Brett at http://www.edesignaudio.com/contact.php and ask him for an STi underseat box. Thanks for looking * Registered users of the site do not see these ads.

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10-13-2009, 04:30 PM	#2
OAKOS Automotive NASIOC Vendor Member#: 18261 Join Date: May 2002 Chapter/Region: MWSOC Location: Sterling Heights, MI Vehicle: 2002 Impreza WRX +P www.oakos.com	Nice! My 2.5rs has the factory underseat sub! Bart OAKOS Automotive

10-13-2009, 04:40 PM	#3
djerickd Scooby Guru Member#: 3782 Join Date: Jan 2001 Chapter/Region: South East Location: Tampa Btch! Vehicle:* 02 Old Skool WRX WFC #040 Still Flossin!!!	whoa I bet ur GF loves that!!

10-13-2009, 04:44 PM	#4
Giganticprune Scooby Specialist Member#: 147662 Join Date: Apr 2007 Chapter/Region: MWSOC Location: Orland park IL Vehicle: 2006 wrx tr stage 2 wrb protuned by jorge	no carpet? :\

10-13-2009, 04:45 PM	#5
XanRules Scooby Specialist Member#: 157348 Join Date: Aug 2007 Chapter/Region: South East Location: Hate City, GA Vehicle: 1997 Oh BS Correct Fitment Crew CEO	which alpine amp do you have? I was worried about mounting mine under the seat because apparently they get really hot.

10-13-2009, 05:19 PM	#7
rxer311 Scooby Specialist Member#: 107099 Join Date: Feb 2006 Chapter/Region: Tri-State Location: Lancaster, PA Vehicle: '07 STI Satin White Pearl	I have an alpine f-450 amp. It does get hot. Best way to do it is put it on "feet". Pretty much mount each corner to a 1/2" peice of plywood or similar. That keeps it off the floor to help with cooling. Also there are air vents under your seat (when you put the switch to the feet position). If it gets hot...crank the A/C on it!

10-13-2009, 05:22 PM	#9
djerickd Scooby Guru Member#: 3782 Join Date: Jan 2001 Chapter/Region: South East Location: Tampa Btch! Vehicle:* 02 Old Skool WRX WFC #040 Still Flossin!!!	u will have to surprise her!

10-13-2009, 05:27 PM	#10
rxer311 Scooby Specialist Member#: 107099 Join Date: Feb 2006 Chapter/Region: Tri-State Location: Lancaster, PA Vehicle: '07 STI Satin White Pearl	By the way there is only 75watts going to this thing and it sounds better than the crappy MA audio 12" sub I had in my trunk with 150 watts going to it. I was pleasantly suprised at how well it works. It is very well balanced with the components I have. I actually have the subwoofer turned down right now.

10-13-2009, 05:31 PM	#11
XanRules Scooby Specialist Member#: 157348 Join Date: Aug 2007 Chapter/Region: South East Location: Hate City, GA Vehicle: 1997 Oh BS Correct Fitment Crew CEO	I've got an Alpine...something. 250? It's nailed on my back seat right now. Not literally nailed. But whatever.

10-13-2009, 06:30 PM	#12
jarencibia Scooby Newbie Member#: 187021 Join Date: Aug 2008 Chapter/Region: Tri-State Location: NJ Vehicle: 2004 WRX Sedan PSM	Awesome! I may have to copy your idea....

10-13-2009, 06:46 PM	#13
mr_hann Scooby Newbie Member#: 165244 Join Date: Nov 2007 Chapter/Region: MAIC Vehicle: 2007 2.5i OBP	Does the sub hit the seat at all (ie can you still move the seat back and forth)? And do you happen to have a shot from the side? Your idea has sold me.

10-13-2009, 06:46 PM	#14
AcquaCow NASIOC Supporter Member#: 36838 Join Date: May 2003 Chapter/Region: MAIC Location: Oakton VA Vehicle: 2000 RS Sedan 2001 RSTi Sedan	STi seats? I wonder if Rick has any more of his fiberglass/wood STi underseat sub boxes? I actually have two eD 6.5"s in my car and I did test fit and noticed they fit under the passenger seat just fine... almost broke out the fiberglass and started building a mold of the floor/chair rails on the spot I do plan to disassemble a wrx seat some day soon to steal the rails from it and use them to template a box using all of the air volume available under the seat... -- Dave

10-13-2009, 06:49 PM	#15
Back Road Runner Scooby Specialist Member#: 60082 Join Date: Apr 2004 Location: Minnesota Vehicle: 2002 Forester Blue	...but...but...that's where my amps go. Nice job. That's one benefit of the low Qts sub designs ED makes, tiny boxes.

10-13-2009, 07:01 PM	#17
labcoat NASIOC Supporter Member#: 33629 Join Date: Mar 2003 Chapter/Region: MAIC Location: Arlington VA Vehicle: 03 WRX Wagon WR Blue	rxer311 Looks good paint the box, a few coats of rattle can black and you would be surprised how it just completely disappear. I'm glad this worked out for you. R-

10-14-2009, 01:55 PM	#20
couchflambeau Scooby Specialist Member#: 102145 Join Date: Dec 2005 Chapter/Region: MWSOC Location: Grand Forks, ND Vehicle: '04 STi/Cobb St. II 18L Java Black Pearl	You're concerned about the weight of carpet but built an MDF box... (penny-wise/pound foolish??) Fiberglass FTW... save weight AND space...

10-14-2009, 02:23 PM	#21
STiML8 Scooby Newbie Member#: 103711 Join Date: Dec 2005	How much did it cost u?

10-14-2009, 03:20 PM	#25
noktrnal1 Scooby Newbie Member#: 90957 Join Date: Jul 2005 Chapter/Region: SCIC Location: San Diego, Ca Vehicle: 2004 WRX San Remo Red	Thats pretty sweet, I'd heard the factory sub wasn't much to speak of so I wanted to do a little something more. Thanks for the info and pics.