Subwoofer in Trunk

BananaCar · 12-14-2017, 12:07 PM

Today I went to an audio shop to ask about getting a subwoofer installed in the trunk. The installer said my car has steel frame in the back of the seats and it is essentially sealed. He said a wooded in the trunk won't be as effective and best to upgrade the speakers inside of the car. Any truth to this? I have HK upgrade but would like to add more low end. Thanks.

r33_RGSport · 12-14-2017, 11:10 PM

Quote:

Originally Posted by BananaCar

Today I went to an audio shop to ask about getting a subwoofer installed in the trunk. The installer said my car has steel frame in the back of the seats and it is essentially sealed. He said a wooded in the trunk won't be as effective and best to upgrade the speakers inside of the car. Any truth to this? I have HK upgrade but would like to add more low end. Thanks.

You may want to consider BavSound.
I love mine so much and couple of my local customers that I installed are having a blast with the upgrade.

BGT3 · 12-18-2017, 03:22 PM

Quote:

Originally Posted by BananaCar

Today I went to an audio shop to ask about getting a subwoofer installed in the trunk. The installer said my car has steel frame in the back of the seats and it is essentially sealed. He said a wooded in the trunk won't be as effective and best to upgrade the speakers inside of the car. Any truth to this? I have HK upgrade but would like to add more low end. Thanks.

I believe these Focal subs are plug and play with the underseat OEM ones, not sure how they compare with the Bavsound subs.

https://www.focal.com/en/car-audio/c...#compatibility

nsa100 · 12-20-2017, 10:10 AM

Quote:

Originally Posted by r33_RGSport

You may want to consider BavSound.
I love mine so much and couple of my local customers that I installed are having a blast with the upgrade.

I also agree the Bavsound Ghost Subs are pretty good and a definite improvement, but they will not replicate the bass of a subwoofer.
Anybody thinking of adding a subwoofer in the G30 should consider specifying the ski hatch if buying new.

swordfishunter · 12-21-2017, 08:44 AM

The ski hatch is just the entire center seat back rest folding down, and not just a hole from the armrest.

I have the earthquake SRS in mine at the moment with the HK, with a audioquest carbon cable linked to an iPhone.
With the proper settings this is adequate for the time being. It hits harder than expected maybe down to the mid 30hz?

That being said, I have a some Focal KE100's, a helix v6, and a jl10w7 with a jl hd750 amp sitting in a cardboard box begging to be installed.

dcwjd · 12-21-2017, 10:08 AM

I measured and there isn’t much clearance in the trunk. Only 11 inches total from floor of trunk to rear deck. I think an 8 inch sub is all that would fit

BananaCar · 12-22-2017, 11:20 AM

Quote:

Originally Posted by nsa100

Quote:

Originally Posted by r33_RGSport

You may want to consider BavSound.
I love mine so much and couple of my local customers that I installed are having a blast with the upgrade.

I also agree the Bavsound Ghost Subs are pretty good and a definite improvement, but they will not replicate the bass of a subwoofer.
Anybody thinking of adding a subwoofer in the G30 should consider specifying the ski hatch if buying new.

This is the reason I want to avoid the bandaids solution.

Flyingscotsman · 12-22-2017, 08:11 PM

Quote:

Originally Posted by dcwjd

I measured and there isn’t much clearance in the trunk. Only 11 inches total from floor of trunk to rear deck. I think an 8 inch sub is all that would fit

Do you have the space saver spare tyre in yours?
I know that option eats into available space in the trunk area. I've a G30 coming at the end of January and had thought about the possibility of adding my JL sub if the bass isn't deep enough for me, but if it's only 11 inches of height available, then there's no chance as it's almost 14" high.

dcwjd · 12-23-2017, 06:04 AM

Quote:

Originally Posted by Flyingscotsman

Do you have the space saver spare tyre in yours?
I know that option eats into available space in the trunk area. I've a G30 coming at the end of January and had thought about the possibility of adding my JL sub if the bass isn't deep enough for me, but if it's only 11 inches of height available, then there's no chance as it's almost 14" high.

Yes I have the spare in the trunk and it eats up a ton of space. I have a JL audio box I wanted to add but there is no possible way. The best option is a fiberglass enclosure for one of the rear corners but it’s very pricey. I contacted Musicar Northwest to see if they have anything made for our cars yet.

spyfish007 · 01-08-2018, 10:30 PM

Quote:

Originally Posted by BananaCar

Today I went to an audio shop to ask about getting a subwoofer installed in the trunk. The installer said my car has steel frame in the back of the seats and it is essentially sealed. He said a wooded in the trunk won't be as effective and best to upgrade the speakers inside of the car. Any truth to this? I have HK upgrade but would like to add more low end. Thanks.

Yes a sealed trunk is a classic issue when trying to make bass. Experience has taught this to installers for decades. Some will try to drill holes in the rear deck or remove rear deck speakers to open things up a bit. When in this situation I recommend removing rear deck speakers if an option. The bonus is you will likely improve sound stage up front because you no longer have tweeters coming from behind you.

mittu · 05-13-2021, 09:17 PM

Quote:

Originally Posted by Flyingscotsman

Do you have the space saver spare tyre in yours?
I know that option eats into available space in the trunk area. I've a G30 coming at the end of January and had thought about the possibility of adding my JL sub if the bass isn't deep enough for me, but if it's only 11 inches of height available, then there's no chance as it's almost 14" high.

installing a sub and amp in the boot. My car doesnt have folding seats.
Ive read on a few forums that most of the bass wont make its way into the cabin because. Any truth to this?

want to install a sub thats 300-400W RMS. will this be sufficient to compensate sound insulation of my sealed boot?

Also on the HK system does anyone know the underseat subwoofer wiring colours?

Im trying to tap into them from the boot where the amp is.
Would avoid needing to unscrew from seats and sub.

Danny_C · 03-30-2026, 10:51 PM

Hey guys I’m trying to install a subwoofer and it seems the previous owner had the same idea however I’m not a big audio guy is there anyone that could point me in the right direction to what u could connect to these or what my next step is to installing a sub in the back? I’ve been told a single 12 should be good enough for my base needs.

12-14-2017, 12:07 PM	#1
BananaCar Second Lieutenant 60 Rep 221 Posts Drives: N/A Join Date: May 2012 Location: Miami, FL iTrader: (0)	Subwoofer in Trunk Today I went to an audio shop to ask about getting a subwoofer installed in the trunk. The installer said my car has steel frame in the back of the seats and it is essentially sealed. He said a wooded in the trunk won't be as effective and best to upgrade the speakers inside of the car. Any truth to this? I have HK upgrade but would like to add more low end. Thanks.
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12-21-2017, 08:44 AM	#5
swordfishunter New Member 9 Rep 15 Posts Drives: x3 Join Date: Sep 2012 Location: Singapore iTrader: (0)	The ski hatch is just the entire center seat back rest folding down, and not just a hole from the armrest. I have the earthquake SRS in mine at the moment with the HK, with a audioquest carbon cable linked to an iPhone. With the proper settings this is adequate for the time being. It hits harder than expected maybe down to the mid 30hz? That being said, I have a some Focal KE100's, a helix v6, and a jl10w7 with a jl hd750 amp sitting in a cardboard box begging to be installed.
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12-21-2017, 10:08 AM	#6
dcwjd Private First Class 37 Rep 129 Posts Drives: 2021 m5 comp Join Date: Mar 2008 Location: Long Island , NY iTrader: (0)	I measured and there isn’t much clearance in the trunk. Only 11 inches total from floor of trunk to rear deck. I think an 8 inch sub is all that would fit
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03-30-2026, 10:51 PM	#12
Danny_C Registered 0 Rep 4 Posts Drives: 2009 BMW 328XI Join Date: Feb 2024 Location: illinois iTrader: (0) Garage List Bmw 328xi [0.00]	Hey guys I’m trying to install a subwoofer and it seems the previous owner had the same idea however I’m not a big audio guy is there anyone that could point me in the right direction to what u could connect to these or what my next step is to installing a sub in the back? I’ve been told a single 12 should be good enough for my base needs. Attached Images
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