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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 04-16-2013, 10:07 PM   #1
garrafa
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E46 convertible subwoofer MDF bracket 12" 10" 8" Haman Kardon upgrade

I built a custom and precision CNC cut 3/4" thick MDF bracket to install up to a 12" subwoofer into the location of the OEM subwoofer of BMW E46 convertible models 325 328 330 M3.

Bracket only fits convertibles since they have the opening between the rear seat passenger area and the trunk, perfect for installing a large high powered subwoofer! and show it off too!

Installs into existing threaded holes of the car's frame. NO MODIFICATION TO THE CAR NEEDED.

Why would you want to install an aftermarket subwoofer? As an example, the Harman Kardon "premium" sound system in these cars have subwoofers that are rated at 40 Watts (see photo) this is very underpowered and hardly "premium". You can install subwoofers that can easily handle from 300-1400 Watts for as low as $50 to $250. The sound improvement is incredible, you'll feel your music! If you like bass with your music, I don't need to explain this to you.

You will need a separate amplifier to power your new subwoofer since the OEM amp in the car can't power higher powered subs, but these are inexpensive too, you can get one for under $100.

You can reinstall the seats and hide the subwoofer behind the armrest (see photos) for an OEM look or just leave the seats off (save about 40 lbs of weight) and show off your sub!
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Last edited by Dave; 05-19-2013 at 12:59 PM. Reason: Auto-save 1368986387
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Old 05-07-2013, 02:17 PM   #2
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looks great mate,hows it sound?
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Old 05-07-2013, 03:32 PM   #3
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Are you a sponsor? I don't think this site condones advertising by members... especially for a $75 piece of wood.
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Old 05-07-2013, 04:01 PM   #4
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Originally Posted by e46 330ci vert View Post
looks great mate,hows it sound?
Sounds ridiculous, very powerful, shakes your core, you are heard, you hear low frequencies never before reproduced by the OEM "premium" Harman Kardon subwoofer... highly recommend this mod. You can stand next the car with the top down and enjoy the music without being in it... and still hear/feel the powerful bass sound.... hookup a bluetooth reciever to the amp, pair to your phone and now you can control the music while sipping on a beer at a pub and car parked next to you... you get the picture
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Old 05-08-2013, 12:53 AM   #5
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nice 1 garrafa,thanks for sharing.
I just made the baffle plate last night after seeing yours.
many thxs bud
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Old 05-08-2013, 01:24 AM   #6
garrafa
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nice 1 garrafa,thanks for sharing.
I just made the baffle plate last night after seeing yours.
many thxs bud
cool! post some pics!
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Old 05-11-2013, 07:08 PM   #7
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im still debating doing this,does the speaker rubber flex on the seat frame?
looks like it does
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Old 05-11-2013, 07:13 PM   #8
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E46 convertible subwoofer MDF bracket 12" 10" 8" Haman Kardon upgrade

So what's the back side look like in the trunk?
Any examples of amps you use? Do u tap into the sub line, or do you use the powered amp supply.


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Old 05-11-2013, 07:22 PM   #9
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im running aftermarket hu,fosgate subs
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Old 05-11-2013, 07:31 PM   #10
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heres how my old 10" hertz looked

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Old 05-18-2013, 09:45 PM   #11
garrafa
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Originally Posted by e46 330ci vert View Post
im still debating doing this,does the speaker rubber flex on the seat frame?
looks like it does
Not sure what you mean. The rubber flexes as the cone pumps up and down (the Infinity Kappa I used has an excursion allowance of about one inch 1").

If you mean that if the rubber of the sub touches the sides of the seats, it does, but it doesn't affect sound much since low frequencies are not as susceptible to slight contact on the rubber lining.

I run my sub without rear seats, see pics I've just posted. If you really don't want your seats to touch the sub rubber, you could modify the rear of the seats by undoing the leather stitching, shaving of some of the foam to conform to the new rear shape needed, re-stich and your set!
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Old 05-18-2013, 09:55 PM   #12
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So what's the back side look like in the trunk?
Any examples of amps you use? Do u tap into the sub line, or do you use the powered amp supply.


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See pics below for back side of sub! I used an "Alpine 5 ch amp MRX-V70 -Power Rating=90W x 4 + 350W x 1 (all RMS at 2 ohms)). I don't tap into the sub line. I feed four regular channels into the amp. The amp has a sub output which it generates from the four inputs. I used the amps newly created sub output!

You also need to use a "free-air" sub. I used an Infinity Kappa 12" rated at 350W RMS at 2 ohms).
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Old 05-18-2013, 10:04 PM   #13
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Pics of my install set 1 of 2

Pics of my install set 1 of 2
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Old 05-18-2013, 10:15 PM   #14
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Pics of my install set 2 of 2

Pics of my install set 2 of 2
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Old 05-19-2013, 12:09 AM   #15
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many thanks for the pics garrafa.
theres a few things stopping me doing this.
firstly the cost of a good ib 12"sub is about 300 gbp plus shipping/customs charges = the uk is crap for decent ib subs.
then theres the fitment,i think the seats metal frame will be touching the subs rubber,suppose you could bend that out of the way,lol.
so as i had 400 rms going to my hertz es250 im getting a dls oa 10d that runs ib,have the cone facing the boot.
if im happy with the results but still want more then it means saving my pennys to get a id max 10" ib from usa about 500.
at the end of the day i want some decent bass/all my boot space and all panels replaced back in the car.

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Old 05-19-2013, 09:59 AM   #16
garrafa
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Originally Posted by e46 330ci vert View Post
many thanks for the pics garrafa.
theres a few things stopping me doing this.
firstly the cost of a good ib 12"sub is about 300 gbp plus shipping/customs charges = the uk is crap for decent ib subs.
then theres the fitment,i think the seats metal frame will be touching the subs rubber,suppose you could bend that out of the way,lol.
so as i had 400 rms going to my hertz es250 im getting a dls oa 10d that runs ib,have the cone facing the boot.
if im happy with the results but still want more then it means saving my pennys to get a id max 10" ib from usa about 500.
at the end of the day i want some decent bass/all my boot space and all panels replaced back in the car.
Have you looked on Amazon.com? I got my Infinity sub for under about US$180 (suggested retail price $300) and the Alpine amp for about $280 (suggested retail price $400).
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Old 05-19-2013, 12:59 PM   #17
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Are you a sponsor? I don't think this site condones advertising by members... especially for a $75 piece of wood.
Agreed.

If you have something to sell, do it in the Classifieds section.
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Old 05-19-2013, 06:10 PM   #18
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Nice... I put a 100W 2 ohm 10 inch Bazooka back there a few years ago... Works good also...
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Old 05-19-2013, 09:02 PM   #19
garrafa
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Agreed.

If you have something to sell, do it in the Classifieds section.
Ok got it, I had no idea I had to post on the Classifieds section (nor that it existed), will do so. Sorry for the annoyance. Best.
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Old 05-20-2013, 11:37 AM   #20
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Getting back to discussing the bracket and that sub, is there a guide to what other subs might fit there without sacrificing trunk space? I was drawn to the BSW because of that and the plug/play nature of not needing to wire up another amp (which I'm sure is not difficult... but I'd have to find space for it and know what I was doing and start wondering about crossovers and whatnot) If there's a cheaper alternative (with better customer service) with a guide on how to integrate it with a good set of front door speakers, I'd love to see it.

I'm sure there's plenty of wiring guides and speaker comparisons in the ICE forum. But vert-specific subwoofer suggestions that could use this bracket, or links to them, would be a nice addition here.
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