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BMW 3-Series (E90 E92) Forum
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DIY: Under seats sub upgrade
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03-30-2007, 04:47 PM | #1 |
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DIY: Under seats sub upgrade (see page 7 for the solution)
Hi everyone !
Today I started my under seats sub upgrade, not so easy... Background Hifi option in Belgium (= standard in U.S.) Amp upgraded with DSP see previous post Now to the sub upgrade 1- Seat removal (done in 5min) 4 torx and you're done, do not forget to unplug your battery or you will have trouble with the airbag etc... and need to get to dealer to get it reset. (thanks ebanul for the tip ![]() 2- Now remove the sub cover the sub itself and the enclosure, again a few torx and done in 10min. 3- Here comes the fun !! Left to right, the enclosure, original sub and the Pioneer The depth of the sub is quite different, no need to say that the original enclosure will not match ! ![]() ![]() ![]() ![]() Indeed that does not fit as it should ![]() See how the original sub fits ? nothing above the original enclosure, or the seat will not go back in place. ![]() Use the original enclosure as a pattern. ![]() Place the pattern received with the Pioneer. Mark the inside hole. ![]() This is what you should get ![]() Copy/Paste the piece you just have done, but this time mark the external pioneer hole. ![]() This is what you should get ![]() It fits the new subs quite ok but I'm not satisfied with the details but that's a first try. If it works as it should I will redo it better. ![]() Time to see if it fits the car, ok for now ![]() I need to place the sub and complete the enclosure but this is enough for one day... to be continued... grr, I so curious to hear it... tomorrow maybe... Last edited by etik; 10-06-2007 at 08:33 AM.. |
03-30-2007, 05:07 PM | #5 |
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Great work thus far. Let us know how it sounds.
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03-30-2007, 05:28 PM | #8 |
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Do you know the approximate volume of your enclosure? Thanks.
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03-30-2007, 05:31 PM | #9 |
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03-30-2007, 06:13 PM | #11 |
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03-30-2007, 06:17 PM | #12 | |
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I will make them fit ![]() The sad thing... is that I have to do it twice ![]() |
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03-30-2007, 06:42 PM | #13 |
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Drives: E90 325i, E82 135i
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OMG!!
![]() ![]() ![]() ![]() Will this do anything for the sound even if you haven't upgrade the amp? |
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03-30-2007, 07:02 PM | #14 | |
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Here's some info on the Earthquakes.. its not as easy as they make it sound though. Last edited by M335i; 03-30-2007 at 07:19 PM.. |
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03-30-2007, 07:29 PM | #15 |
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03-30-2007, 07:47 PM | #16 | |
pull my finger to get your kinder® surprise
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you'll have to upgrade the amp to power the aftermarket subs, or else you won't get the best out of the subs as the factory amp doesn't have enough juice to pump those aftermarket subs
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03-30-2007, 08:12 PM | #17 | |
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I find that pointing the sub (shallow box in the trunk) towards the rear and having the acoustic bounce from that position works well. ![]() |
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03-30-2007, 09:23 PM | #18 |
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This should be a direct swap for E90 USA standard stereo cars. The subs are 8". You need to get an external amp however as the stock amp is only 40W for std and 70W for logic 7. Even with logic 7 you need more power. I highly doubt BMW amp provides a full continuous 70watts...maybe half if that.
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03-30-2007, 09:49 PM | #19 |
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Oh man what a find, keep us posted and let us know how it turns out, if you like how it ends up, I am so doing this the following weekend after your report back. Thanks Awesome job
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03-31-2007, 04:43 PM | #22 |
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Just finished the job, it's indeed ALOT of work. What I've just learn is that the enclosure are not the same on both side. So you have to do the effort twice instead of one and copy / paste
![]() I did some try, WHAOOO !! not only your ass is shaking but the whole car. I've still to find the right balance/tuning on AMP. To be honest, I would prefer bass from the trunk like I used to have before in another car. But I wanted to keep my trunk free and have the car look like original. To answer question in this post - The factory sub does not handle upgraded AMP, they burn in 5secs (75rms) - The factory amp is too small to power after market sub So you need to change them both ![]() More pics soon !! |
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