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JL Audio 300/4 Amp install pictures


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I thought I'd post my solution to installing a decent sized amp in the 911 without losing the ability to pack the nose or have the amp overheating when the trunk is full of luggage. My brother and I welded up some sheet aluminum with a couple breaks to form a shelf for the amp. The mount utilizes stock holes for the bracket. There are no holes drilled in the car for this mount. The only 'trick' to the install is repositioning the spare tire. It is shifted to the driver's side (using the factory bracket) and canted about 15 degrees forward with an aluminum 'wedge'.

The bracket is rock solid and there is no movement, even with 'spirited' driving. I am *very* pleased with the end result. Still some more tweaking to do, such as powdercoating the bracket black. Also, I'm going to be building another bracket to hold my sub amp ( JL 250/1 ). I *think* it is going to be mounted perpindicular to the 300/4 on the passenger side of the trunk. We'll see how it ends up.

BTW, total cost was $00.00 for materials (scrap laying around the shop) and about 4 hours of building from start to finish.

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  • 9 months later...

I noticed that You have the crossovers in the front trunk. Is it difficult to replace the wires for the dash speakers ? or are there enough place to feed two pair of wires ? how do you run the wires from the head unit to the trunk and back ? are there enough room in the standard grommet on the passenger side ? How about the rear speakers, are they two way as well with crossovers ?

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I noticed that You have the crossovers in the front trunk. Is it difficult to replace the wires for the dash speakers ? or are there enough place to feed two pair of wires ? how do you run the wires from the head unit to the trunk and back ? are there enough room in the standard grommet on the passenger side ? How about the rear speakers, are they two way as well with crossovers ?

Crossovers are in the front trunk. The rear speakers do not have crossovers as they are really just there for fill effect. The head unit is only sending about 70% of the signal that is going to the front speakers so that they don't overpower the front and create an imaging issue.

The amp, and the crossovers, are plugged into the factory wiring harness so there are no speaker wires to run. The fun part was figuring out which wires go where. There are a set for the doors, a set for the dash speakers, and a set for the rear speakers. Oh, and the colors of the wires change from the trunk to the speaker sites.

Wiring from the head unit to the trunk is a one-way route. Plug into the back of the head unit and run forward through one of the factory grommets (which I had to enlarge. There are RCA cables that are probably small enough to limit the enlargement substantially).

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