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Old 04-14-2004, 02:26 AM   #2
Registered User
Join Date: Aug 2003
Location: Arizona
Posts: 18
My Ride: 2002 M3
I installed my JL Audio 250/1 under the rear deck and I haven't had any issues with it so far. Of course, it isn't the most ideal mounting scenario especially since the heat rises straight into your amplifier, yet having a fan and some clearance for air to circulate won't hurt. I got my idea from fellow e46fanatic Frank Rizzo, you can check out his post here Frank Rizzo's Install. He mounted his amp using a size 10-32 screw, some well nuts, and nylon spacers. The well nuts are basically rubber rivets, and you can find them in any local hardware store. I had to modify his method a little and mount a board to the rear deck using the well nuts. Then I mounted the amp to the board with nylon spacers to give it some breathing room. Finally, I cut up the HK sub system and used it as a cover to hide all the wiring and make the install appear stealth when you're looking into the trunk. You can't see the amp until you look under the deck. Here are some pics for reference; hope this helps!

Here's the mounting board attached to the rear deck:

Here's the final product when seen directly at rear deck level:
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