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Re: Free air isn't tight enough... (archive)

[ Follow Ups ] [ 3-series (E46) Message Board ] [ Msg. Board FAQ ]

Posted by Junie on November 28, 1999 at 11:56:51:

In Reply to: Re: Subwoofer posted by the sub god on November 25, 1999 at 02:00:05:

I really want clean bass, and free air applications just usually don't sound very tight, so I probably will have a small enclosure built to fire through the ski sack. I'm going to have a custom speaker grill to replace the sack. I realize that as long as the trunk can still fit golf clubs, that's all the space I need.

Thanks for your help.

: a sub on the rear deck is the only option if space is a premium, and since the lid supports are pneumatic, there's not much to hinder your upgrade. be aware that you will need to cut a similar hole in the rear deck for mounting. the correct type of sub is a free-air sub - meaning the airspace or "box" is going to be your trunk. make sure to reinforce the rear deck with a thick panel of medium density fiberboard (mdf) and you're done. dynamatting the deck and panel is not a bad idea to reduce resonance. btw, no need to remove the ski sack since bass is coming from the top of the deck and not below. in fact, removing the sack and leaving it open is bad because rear waves can cancel the waves coming from the front of the sub. free-air response is ok but not as good since the trunk does not completely separate front and rear signal waves as well as having more air than necessary. sealed subs are more precise in sound while bandpass or ported subs are boomier. a last option, and the simplest of them all, is getting a bass tube.

: : About the only thing I'm disappointed with in the car is the stereo. I'm installing a couple of amps, new speakers (a/d/s) in the front, and a single 10" subwoofer in the trunk, and was wondering if anyone has suggestions in preserving the trunk space, as well as just getting clean sound. I'll probably have the trunks mounted on the rear deck. I'll also probably have the ski sack taken out to allow the bass to come through cleaner.

: : Any thoughts or suggestions? My other concern is the rear deck rattling, since it seems pretty flimsy...

: : Thanks all!!!

: : Junie

: : 2000 328i Sport/Premium
: : Titanium Silver/Gray Leather

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