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here is what to do...(long) (archive)

[ Follow Ups ] [ E36 M3 Message Board ] [ Msg. Board FAQ ]

Posted by eric on October 06, 2000 at 03:14:20:

In Reply to: last question on subwoofer install rec's posted by mrone on October 05, 2000 at 21:32:35:


back to the tired old question regarding the best way to install a subwoofer in your trunk and still have it get into the interior. i have two (2) 10" MTX's and a rockford fosgate (50W x 2; 100w bridged) that I recently purchased. the amp is used as i want the most cost-efficient bang for the buck. i currently have a blaupunkt las vegas head unit running i believe 25w rms and upgraded 5 1/2" up front, stock 4T's in the back -- definitely better than stock.

now, everyone knows about how incredibly sealed bmw trunks are. and without a ski pass/foldable armest in the rear seats, i have no ports whatsoever. so, the dilemma i am having is this:

1) keep the 4T speakers in the back (keep the 'fill'), install the sub box in the very sealed trunk and just hope for the best sound. if I do this, i can parallel the subs; or

2) do a trick install job creating ports in my rear deck, most probably by removing the rear 4T's and using the ports (or some other costly measure which might affect the rear's torsional rigidity-- hype?).

now, it seems that the true hardcore, audiophiles believe that removing the 'fill' seriously downgrades the sound. i believe that my mid's and tweeters up front are sufficient, but not precisely sure what removing the 4T's will do.

will i get good sound removing the rear speakers and replacing them with the sub's? would this be the same sound (or better) as the JL Stealthbox? or should i leave the rear speakers in? keep in mind that i don't want to spend big bucks on this upgrade.

any help appreciated. thanks in advance.


go a head and install the subs with the amp in the car w/ out porting them through the deck. see how you like it.

in a couple of months sell or throw away the fosgate amp and get a stronger amp, you will notice a huge difference. I personally don't like fosgate, and especially don't like them if they are used to power the front speakers. So if you ask if it is ok to move the fosgate to the front speakers and get a more powerful amp for the subs, my answer will be no.

I don't have speakers in the back, just getting a good set of fronts and a high quality amp is enought for me.

2 MTX's will sound a whole lot better than the JL stelth bog, those things are junk

I've never installed in a E36. In the E30, the metal behind the seat is two thick metal supports that run verticly and three thin metal pannels that fill in between the metal pillars and the outside of the seat. My buddy basicly kicked out the center pannel, and fired his JL's facing forward, and it sounds pretty good.

In my car, I have 2 alumapro 12's that fire backwards. I haven't opened up any of the pannels, or ported through the rear deck, and it is plenty audible in the cab. My next door neighbor can hear my car in his room when I have it turned up in my garage (about 300 ft, and through my house and his)

to add to what AL was saying, low bass frequencies are non directional, that is why they can be put in a trunk and don't have to be "aimed" like your fron't speakers. These low frequency's also have the ability to travel through objects like wood (depending on the kind) and metal. I saw a Bob Villa program where they actuall installed a BOSE lifestyle sub underneath the floorboard of the house. Now I know you audiophiles will say that is bad, but my point is that the low tones were heard and felt through the floor.

Also one reason positioning your home sub in a corner or close to the wall is good is because the low bass tones will actually resonate through the walls making the sound seem larger than it really is. Same idea with floor fireng subs, the sound resonates in the floor giving the sound stage a larger effect.

before you go all crazy, just put what you have in, you may be suprized at how much you can hear.

Anybody feel free to correct me if I'm wrong, I'm just sharing what I know
Eric
88M3


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