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      02-12-2015, 06:58 AM   #1
borinous
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E90 Boot subwoofer

Morning All,

Struggling to find the answers on the forum but i'm looking into audio upgrades and rather than go down the Earthquake underseat root i'm thinking of putting a Single sub in the boot.

However my concern is that because i don't have a ski hatch or folding rear seats is it just going to be a waste of time and the sound will be excessively muffled. I cant seem to find a definitive answer as most of the threads ive found the E90 has the ski hatch and folding seats.
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      02-14-2015, 06:56 AM   #2
bajandrifter
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will be fine, the boot wall isnt that thick/insulated. ive done one before and it was fine, sounded fine. older bmws were very very insulated in the rear seat so that was a prob for them but you will b fine
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      02-14-2015, 09:23 AM   #3
makkan00
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Take a sub in a box.
Then put that in another closed box.

What do you expect?

And b/w you answered your own question.
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      02-16-2015, 04:38 AM   #4
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Quote:
Originally Posted by bajandrifter View Post
will be fine, the boot wall isnt that thick/insulated. ive done one before and it was fine, sounded fine. older bmws were very very insulated in the rear seat so that was a prob for them but you will b fine
That was one of the reasons i asked as a friend put a sub in the boot of his E46 and it sounded rubbish when sitting in the car. i looked around the boot the other day and there isn't many places for the air to move freely from boot to cabin.

Quote:
Originally Posted by makkan00 View Post
Take a sub in a box.
Then put that in another closed box.

What do you expect?

And b/w you answered your own question.
That was exactly my thoughts but just seeing if anyone had ever done it and what it sounded like. Getting abit desperate to upgrade the sounds so looking at cheaper alternatives to get it done quicker
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      02-16-2015, 05:30 AM   #5
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Can you lose the rear shelf speakers , not sure if that would give any extra air flow.
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      02-16-2015, 01:25 PM   #6
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Quote:
Originally Posted by Sparky68
Can you lose the rear shelf speakers , not sure if that would give any extra air flow.
I did think I could add extra holes next to the rear shelf speakers but hide them under the own grilles. but still not sure the air will flow that well as there still a load of sheet metal in the way. only real way to know is to either a) try it out or b) track down someone who is running one now.
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      02-16-2015, 01:54 PM   #7
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I guess you could port it through the shelf?
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      03-10-2015, 12:16 PM   #8
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Try it. Might benefit some other members. I have fold down seats option and made a carpeted back board to hold 2 12s firing towards the boot. Sounds good to me.
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      03-15-2015, 10:08 AM   #9
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Quote:
Originally Posted by borinous View Post
That was one of the reasons i asked as a friend put a sub in the boot of his E46 and it sounded rubbish when sitting in the car. i looked around the boot the other day and there isn't many places for the air to move freely from boot to cabin.
maybe your friend have rubbish,but not sub?
dont know how in e90, but in my old e46 im dont had ski hatch aswell, and drilled out this metal shelf, i think there been 6 or 8 rivets.. just drilled out this rivets, so maybe you can do same in e90...
p.s. sorry for my english
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      03-16-2015, 05:34 AM   #10
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Ideally didn't want to start cutting into or removing sheet metal. Was just wondering if there was enough holes already there to allow the air to move through.

I may well just try it out when i get a chance, currently looking to source an aftermarket headunit, this will make adding a sub somewhat easier
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