Trunk subwoofer question! - Mercedes Benz SLK Forum

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#1 Old 05-28-2015
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Trunk subwoofer question!


I have an 00' SLK320 and I've been quite busy building my audio in the trunk.
I have an 10" Alpine type R in a ported enclosure tuned @ 35hz in the spare tire well.

The bass inside the car is nice at low volumes, when I open my windows it gets a lot louder. The problem is that the pressure building up in the trunk cant reach the cabin.

Have anyone of you modded their car especially for audio? I'm looking for a way to create room between the cabin and the trunk so the sound can enter the cabin.

My trunk rattles when I have my windows closed because it can't handle the pressure. I've ordered dynamat to dampen the trunk but I still need to find a way to create room between the trunk and the cabin...

Any ideas?

Pictures would also be nice!
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#2 Old 05-29-2015
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Have you removed the oem speakers behind the seat? (Assuming you had them). My car came with the Bose system and had a pair of 6.5" woofers behind the seat which when mounted probably blocks some of the sound you are missing from the trunk mounted woofer.

The cavity behind where they are is a straight shot into the interior and in my own system is the reason (I am assuming) I have such great sound.... that being said, you are dealing with a roadster which has the fuel tank between you and where you are mounting your woofer so there are trade off.As for damping...

I laid down multiply layers of Dynamat on all surfaces of my trunk and removed and sprayed the underside of all plastic panels with spray on truck bedliner to make them more rigid. I also carpeted the underside of the trunk lid which gives the car a more finished look and offers a bit of dampening as well, but make sure you use light weight material... the hydraulics of the top are calibrated within a very specific range, and if the trunk is heavier than needs to be you will introduce other problems.

As for pictures click my name and look at my other post, I am in the process of writing up a final definitive thread on my system, but I have also pretty much done everything there is to do in our cars as it relates to stereo and have posted more than I care to remember on the subject as I have worked through various iterations of my project(s) over the past couple of years.
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#3 Old 05-29-2015
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I've done a similar thing in my R171, with no issues...

The rear shelf isn't an airtight fit by any means, and there are plenty of large gaps either side when the roof is up (you can get your hand through them) - is this the same in the R170 ..?

When it's down the exhaust takes over...

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#4 Old 07-16-2015
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Hey, I added subs but I went with 2 8's in a super tight enclosure. I don't know if you can view the link but if so you'll see the subs are facing the rear. I eventually had to face them forward which provided me a deep and full sound in the cabin. Windows up or down it sounds clear and heavy depending on what you're listening to. You wouldn't imagine 2 8's would sound so full and heavy but hearing real time will make you think twice about 8" subs. At the time I was running a kenwood deck which is upside down in the clip, my bad! An alpine 500 watt RMS mono amp but had to turn the gain down to match the small cabin size and to ensure I didn't overdrive the subs. With that 10", chances are it's firing straight up. You are correct, you need area for the sound to travel but I don't know how it's going to work in this particular car. Once I let the top down my sound quality goes away and everything rattles back there. I generally do not drive blasting my music but with the top up, windows down and the sound at a moderate level it sounds as if the car have a couple of 12's in the trunk. I've since installed a double din Kenwood which was a nightmare but I got it done and changed to a less powerful JBL mono amp which is really clean and nice. The two subs are infinity but I can't remember their RMS. They are 4 ohm subs and my amp is stable down to 2 ohm so I have them set up so that they are matched to the amp and it will hit all day. I'm not trying to sell you on 8" subs but they fulfill all my needs for a complete and full sound.
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