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Old 02-28-2004, 09:47 PM   #1
e24_635csi
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Rear Folding Seats?

do all of the 2 door E36's have the rear folding seats... including the M3's... the reason i ask is that i hear that BMW trunks are sealed so well that its hard to hear bass with subs in the trunk... and when i eventually get an M3 i want to put 2 JL's probally 10''s in the spot where the rear seats fold down...

check out this link of a guy who did it in his 99' 323is. It seems like a really good idea.

http://www.ramstein.com/baller.htm

Has anyone else experimented with this, or have an info that could help me out.

Thanks in advance,

Matt
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Old 02-28-2004, 10:22 PM   #2
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Re: Rear Folding Seats?

Quote:
Originally posted by e24_635csi
do all of the 2 door E36's have the rear folding seats... including the M3's... the reason i ask is that i hear that BMW trunks are sealed so well that its hard to hear bass with subs in the trunk... and when i eventually get an M3 i want to put 2 JL's probally 10''s in the spot where the rear seats fold down...

check out this link of a guy who did it in his 99' 323is. It seems like a really good idea.

http://www.ramstein.com/baller.htm

Has anyone else experimented with this, or have an info that could help me out.

Thanks in advance,

Matt
the folding seats were an option on the E36's and not all of them have it.

if the rear seats have have the center arm that comes out of the rear seats, then u do not have the rear folding seats.

if there is no center arm in the rear seats the seats will fold, and the button is on top of the seats right where the seatbelt comes out (Red button)

and the trunk is sealed very good, in the summer when i have the stereo up i always put my seat down where the amp is screwed down. and u can hear the difference as when the seat is up. and with the seat up the whole panel where the rear speakers are is vibrating like crazy, tell the guys that install it for you to fix that right away as well.
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Old 02-28-2004, 11:03 PM   #3
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thanks for the info, now i know what to look for.
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Old 02-29-2004, 11:12 PM   #4
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.. yeah the BMW trunks are sealed very very well... perfect for hiding a dead body.

Keep in mind if the BMW came with the winter package ... (folding down armrest)... you can take out the ski-bag that's behind the armrest, and it's a clean port to the trunk... perfect for porting your subwoofers into the main cabin---and you don't have to worry about folding up/down your seats everytime.. or if there are passengers in the back seat.

I've already got my 3 10" JL W3's....... I also have a new pair of 12"'s ... think I'm going to go with 3 10's tho.
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Old 02-29-2004, 11:14 PM   #5
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But dont u get more Bass if the subs r facing the other way??
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Old 02-29-2004, 11:34 PM   #6
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Quote:
Originally posted by Justin e36

I've already got my 3 10" JL W3's....... I also have a new pair of 12"'s ... think I'm going to go with 3 10's tho.
How do you like you JL's?? I've been looking into subs for a while now and i seem pretty set on 2 JL 12W6 V2's and a JL 500/1 amp... but ill probally wait until the summer..

Are the odds of me finding a M3 with folding seats better than me finding them without..

Ive also taken the ski hole into consideration... but just the way that i saw that set up on the 323 looks real nice as well.
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Old 02-29-2004, 11:37 PM   #7
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Quote:
Originally posted by Justin e36
.. ---and you don't have to worry about folding up/down your seats everytime.. or if there are passengers in the back seat.
Oh i dont have to worry about passengers in the back seats... i dont have any friends
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Old 03-01-2004, 12:01 AM   #8
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Quote:
Originally posted by e24_635csi
How do you like you JL's?? I've been looking into subs for a while now and i seem pretty set on 2 JL 12W6 V2's and a JL 500/1 amp... but ill probally wait until the summer..

Are the odds of me finding a M3 with folding seats better than me finding them without..

Ive also taken the ski hole into consideration... but just the way that i saw that set up on the 323 looks real nice as well.
Honestly?... The DL W6 Vw's are not great, but not the worst either. They're not expensive.. and you get a lot of bang for your buck. My buddy has a couple 12's in the back of his hatchback... it pounds okay, but it doesn't sound nearly as good or loud as Infinity sub's.. (which you pay big $$$ for though.)

The only reason I have the 3 10's and the 2 12's is because my uncle was working for JL Audio around a year ago... and he hooked me up for a very good price. All brand new---the 3 10's I bought for $40 each.. and the 2 12's I bought for $50 each.

I'd say how it sounds depends more on how you design your box and your set up... the amp you use, and your wires... than the brand of the subwoofers.
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Old 03-01-2004, 02:22 AM   #9
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yeah i guess your right, thanks for the input tho.
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Old 03-01-2004, 02:38 AM   #10
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Quote:
Originally posted by ZiMMie
But dont u get more Bass if the subs r facing the other way
thats what i was thinking.... that setup looks nice, but I bet it sounds like ass... especially if the seats are up.
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Old 03-01-2004, 03:22 AM   #11
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Quote:
Originally posted by ZiMMie
But dont u get more Bass if the subs r facing the other way??
Yes this is true. I've tried it both ways, and with the subs facing in the cabin, it sounds like crap!
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Old 03-01-2004, 04:19 AM   #12
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If u choose for ur sound setup to sound better when u at the back of the car then u can face the sub that way but if u want some clean bass in ur ear u better turn those suckers around.
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Old 03-01-2004, 07:54 PM   #13
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why is it that they sound better facing the other way?
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Old 03-01-2004, 08:21 PM   #14
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justin: how comparable are JLs and Kicker ? I heard they both pretty good.
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Old 03-01-2004, 11:26 PM   #15
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Quote:
Originally posted by e24_635csi
why is it that they sound better facing the other way?
It's difficult to explain this without drawing you some pictures. In short, facing the sub's so they fire into the trunk gives you a LOUDER bass. facing them into the cabin, you get a crisper bass. In the end, it depends on your preference. Most people try placing their box in both directions and easily notice that the bass is much louder when it fires into the trunk. (their chest rattles more... you can feel/hear the bass from further away from the vehicle).. however you loose some of the frequency response of the music you're listening to. (which you'd notice a lot more in classical, jazz, or acoustic music... compared to most mainstream pop---where a lot of the time distorted bass frequencies are already establised at the time the song is recorded.)

A lot of what you hear, and what you feel depends on speaker placement... a lot of factors take place, such at atmosphere, wavelength, audio cancellation, etc.

A lot goes on in our mind when processing sound. Since our directional hearing and most sensitive detection occur between 400Hz to about 5kHz, (20Hz-20KHz audible detection) the speakers that produce those frequencies are most important with placement. In fact, most high-end components have only one driver producing those frequencies--one speaker = seamless sound. Keep in mind that at lower volumes we are less sensitive to frequencies above & below that rangeómaking it increasingly hard to satisfy our listener.

Bass, is not that picky. We can place the speakers in front of us, behind us, on top or below. I'd shy away from above & below because in a car, cancellation would be high.
Since 99.9% of all subwoofers are placed behind the vehicle operator & his/her passengers, let's assume we're all going to put woofers in the trunk or extended cab section.

Bass is like a whip. The closer you get your head to the tip, the harder it's going to hit you. Get too close to the whip, and it'll wrap around you and not hurt at all. This is true in direct proportion to the frequency.

Deeper bass has longer wavelengths. Since sound travels at 643m/s or 1125ft/s in a standard atmosphere, we divide one of the above by the frequency to get the wavelength. Standard atmosphere 20C, 1013mb pressure, 50% relative humidity. A 50Hz wave has a wavelength of 22.5 feet while a 100Hz wave is 11.25 feet.

In order to get the maximum of 50Hz you'd need to get that woofer 22.5 feet away from your head, while 100Hz, only 11.25 feet. This is why we 'hear' the 100Hz sound more prevalently when facing the woofer box towards the vehicle operator when the box is in the trunk. When we face the woofer box towards the trunk, we get the benefit of 3 feet each way via reflection of sound waves.

Since the 50Hz wave gets more time to approach maximum, it appears louder facing backwards than when facing the frontward. Add this with the cabin gain @ 50Hz, and it would appear to be substantially louder. The 100Hz wave is really not affected so dramatically. In fact, there might be some loss in longer vehicles (SUVs Vans, etc) since the wave may be past the 11.25 foot mark, and weakening.

In most cases, placing the woofer box to face the rear of the vehicle will improve frequency response below 60Hz compared to facing it frontward. As long as you have signal processing (EQ or head unit with bass controls) you can compensate for acoustic loss/gain. In most cases, cutting the strongest frequencies (usually 45Hz-55Hz) will balance out the freq resp and at the same time avoid additional distortion caused by over-boosting signal.

Hope that helps some.
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