Quote:
Originally Posted by xxxmuzk
hello everyone,
i have an 2008 e90 that i just added 2 jl audio 10w3v3 with and alpine pdx 600w amp. i notice that the bass is really muffled pretty well by the rear seat, and i don't have the ski hole pass through, but i have a carseat installed, so that wouldn't help anyway. so, i was looking at ways to "vent" bass into the trunk somehow, and i noticed there is like a slot in the metal right under the rear deck in between the 2 rear speakers. i felt my hand up in there and i felt the top of the rear deck. so, does anyone know if i cut a rectangular slot in the rear deck, would that make a significant difference in bass output coming from the trunk? has anyone cut the rear deck to allow bass to come out of the trunk? or is this more scientific than cutting a slot, similar to tuning a port when you have a ported sub box, and you would have to determine port length and width to "tune" it to a certain frequency? thanks.
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In my E46 325i, I removed the rear deck speakers as I wanted a better front soundstage. That gave me 2- 6.5" holes. The sub sounded much better with the holes open so that some of the sub waves could hit the cabin. It wasn't perfect, but it helped a lot. Also, I had excellent 6.5" mid bass driver (Audiobahn), so I set the sub cutoff around 70-80hz.
The midbass drivers were good at handling low bass without having to go to reproduce below 80-90hz. I kept the door tweets for rear fill for when company was on board, powered by the stock amp.
I was using 1-12" Infinity Perfect sub in a box, driven by 425watts RMS from a Rockford 851X Power series amp. The front comps got 110watts RMS each. Good to very good overall, but not "very good" to "excellent" as the sub needed all that power to do what it did.
If I had a split rear seat it would have been MUCH better. In my previous 2000 Mits Eclipse setup I used Rockford "fanatic X" 6.5" comps and a 10" sub running about 325watts RMS and that system would "HIT" hard. It was a MUCH better overall system.
I don't know if Rockford still makes those comps.
Also, try moving the sub box around in your trunk and switch it facing forward and rearward, experiment to get the best sound you like. Don't forget to try the 180 degree out of phase setting too. If it's on your sub amp try the switch, if not, then simply switch the + and - at the sub connection.
Oh, and don't try to tune the sub placement with the trunk open, it won't sound right