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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 04-05-2004, 03:23 PM   #1 (permalink)
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any one put plexi glass windows in? a kid at my school blew out his windows when he hit a good bass note with his subs i want to put 2 2000 watt rms subs in and of course i wouldn't listen to them all the time but when i would show them off i would play them loud so it could possibly destroy my windows(and my hearing) but that is beside the point i want them and does any one know how to do it
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Old 04-05-2004, 05:35 PM   #2 (permalink)
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what are you rocking in your car?
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Old 04-05-2004, 08:07 PM   #3 (permalink)
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2x 12l audiobahn linear compression subs 2000watts rms 4000watt peak
with 2x class d audiobahn amps 1800 watt rms 3400 watt peak i need like three alternators to power all the stuff but i have no idea how to hook that up
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Old 04-05-2004, 08:09 PM   #4 (permalink)
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you might be fine. ive heard some serious systems in e36's , the only benifit youll see from replacement is the weight reduction
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Old 04-05-2004, 09:09 PM   #5 (permalink)
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Quote:
Originally posted by buuhh99@Apr 5 2004, 07:47 PM
2x 12l audiobahn linear compression subs 2000watts rms 4000watt peak
with 2x class d audiobahn amps 1800 watt rms 3400 watt peak i need like three alternators to power all the stuff but i have no idea how to hook that up
You won't need 3 alternators to run all of that....
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Old 04-05-2004, 09:13 PM   #6 (permalink)
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You put 2 of these in there, then you may need some plexi windows and maybe 2 alternators to power the 8 Kicker Kx1200.1 amps needed to power both Kicker 18 inch Solo-X's(subs hold 10,000 watts peak each, 5,000 rms each, weigh 100 lbs each and sell for $1599 each...)
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Old 04-05-2004, 09:15 PM   #7 (permalink)
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here is the box for 2 of them...double 3/4 inch mdf thick all around...box weighs like 350 lbs! Should be going in the car it is destined for soon, after the customer gets out of his legal troubles...
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Old 04-05-2004, 10:02 PM   #8 (permalink)
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Or you could get a few Brahma's and own everybody... at 440$ a pop for 15"ers... you could make a killing. These puppies have SQ and SPL, and both of those figures are incredible.
yah, If you need plexi or Lexan windows\windshields... Consider being OUTSIDE of the car when you play music that loud. Imagine what your eardrums are doing and your inner ears. It will rip the sensing hairs right out of their sockets. Thatís how you go deaf.

Either way, consider getting the Brahma drivers instead. I have a Tumult in a 3 ft^3 sealed box made of HDF because I wanted the extra low-end extension, based off of the same Brahma design, made for home use, I can tell you it HITS LIKE NO OTHER. (tumult is also rather electrically efficent, dosen't need a crapton of power to get loud)

Once again, Wattage does NOT DETERMINE SPL.
SPL=Sound Pressure Level=loudness
Wattage=Electricity
Wattage does not equal SPL.

Also, once again.. Peak figures are MEANINGLESS. Especially with amplifiers!

(sorry, I'm an audio nazi)
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Old 04-06-2004, 11:57 AM   #9 (permalink)
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Cool stuff, I blow my head off with only 4x 35 watt peak.............
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Old 04-06-2004, 03:03 PM   #10 (permalink)
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i know i will at least have to replace the alternator but doesnt amps * volts equal watts and a 200amp alternator at 12 volts would only produce 2400 watts and each subs rms is 2000! why wouldn't i need three
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Old 04-06-2004, 04:24 PM   #11 (permalink)
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Short: At 200A each, I donít think you need 3. I'd say get 2, 200A alternators and a 4 farads worth of capacitors. You also may want to consider a very nice battery with lots of amp hours. More caps if you can afford it so your lights wont dim when you show off (even more street credit) If you really have cash to burn, go ahead and get the 3 alternators + 5 caps... It can't hurt


Long explanation + crap you may not care about:
Your formula is correct, however remember that your alternator will not produce full output until it reaches a certain RPM. A 200 amp alternator may not produce more than 100 amps at engine idle, if even that much. (I'm not sure on the exact figures but it's *significantly* less than the rated output.) Now, think of how often you are revving your engine compared to just driving along. Not too much juice huh?

To counter that problem, you wont be drawing that amount of power (aprox: 4000-4500W, accounting for amplifier inefficiency) all of the time. The amplifiers are capable of producing that output, but it doesnít draw that amount of power all of the time unless it is driven to the max. For one, I doubt your going to have the volume CRANKED all the way up all of the time anyways, only for a few seconds of a time or a few songs to impress people before it becomes... well, down right uncomfortable. Also, most songs don't have CONSTANT bass tones, but bursts of bass. There is even less current being drawn over time when there is no bass being played, even though at some points it will be drawing upwards of 4Kw. You donít *need* to have alternators produce the amount of power that you will be drawing, thatís also what the battery is for. The alternator + battery + caps just need to be able to keep up with the overal electrical demand.
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Old 04-06-2004, 07:27 PM   #12 (permalink)
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thanks that helps what baterys would u suggegest
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Old 04-06-2004, 10:55 PM   #13 (permalink)
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optima
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Old 04-07-2004, 09:09 AM   #14 (permalink)
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yeah optima red top i beleive its 1000 CCA's the Yellow top is 750 CCA's
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Old 04-07-2004, 06:31 PM   #15 (permalink)
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yeah i have seen thoughs
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