JL HD900/5 sub wiring?

Viktimize · 08-31-2013, 02:59 PM

With only 5 channels that means I need to either run the underseat subs in parallel or series. What is the better accepted way to run them, I haven't really looked at the stock sub specs yet? (Using Technic harness BTW)

ctuna · 08-31-2013, 03:17 PM

Under seats on separate channels is standard.
That a great amp but the sub channel is intended for an
actual trunk sub I think.
You aren't probably going to find any stock sub specs for anything but 2 ohms
for a hi fi. The don't list wattage I think unless its on the speaker physically.

since you are putting that high wattage amp on I think you need to look at upgrading any speakers that you are running a channel to , especialy if you have a base of Hi Fi system . All Hi Fi speakers are 2 ohm .

kaigoss69 · 08-31-2013, 04:17 PM

It doesn't matter from an acoustical standpoint. If you have Hifi, the woofers are 2ohm, so putting them in series will result in a 4 ohm load for the amp. In L7, woofers are 4 ohm, so parallel will result in 2 ohms. HD900/5 sub channel can drive 1.5-8 ohms, but output will be reduced at 8ohm, which may not be a bad thing considering you are driving OEM subs. Be very careful, this amp will smoke those woofers in a heartbeat!

Viktimize · 08-31-2013, 09:42 PM

Quote:

Originally Posted by kaigoss69

It doesn't matter from an acoustical standpoint. If you have Hifi, the woofers are 2ohm, so putting them in series will result in a 4 ohm load for the amp. In L7, woofers are 4 ohm, so parallel will result in 2 ohms. HD900/5 sub channel can drive 1.5-8 ohms, but output will be reduced at 8ohm, which may not be a bad thing considering you are driving OEM subs. Be very careful, this amp will smoke those woofers in a heartbeat!

Perfect. The sub ohms is what I was looking for. So Series it is for my HIFI. Thanks

ctuna · 08-31-2013, 11:38 PM

cdgatti · 09-01-2013, 08:27 AM

I would run 2 channels for the door mids/tweets and 2 for the under seats. You can run the rears off the head unit directly. Then save that hd900 sub channel for a real sub.

08-31-2013, 02:59 PM	#1
Viktimize First Lieutenant 10 Rep 375 Posts Drives: 2007 335i, 2002 325i Join Date: Apr 2013 Location: Edmonton, Alberta, Canada iTrader: (0)	JL HD900/5 sub wiring? With only 5 channels that means I need to either run the underseat subs in parallel or series. What is the better accepted way to run them, I haven't really looked at the stock sub specs yet? (Using Technic harness BTW)
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08-31-2013, 03:17 PM	#2
ctuna Lieutenant General 1911 Rep 13,104 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Underseats on seperate channels is standard. Under seats on separate channels is standard. That a great amp but the sub channel is intended for an actual trunk sub I think. You aren't probably going to find any stock sub specs for anything but 2 ohms for a hi fi. The don't list wattage I think unless its on the speaker physically. since you are putting that high wattage amp on I think you need to look at upgrading any speakers that you are running a channel to , especialy if you have a base of Hi Fi system . All Hi Fi speakers are 2 ohm . Last edited by ctuna; 08-31-2013 at 03:29 PM..
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08-31-2013, 04:17 PM	#3
kaigoss69 Brigadier General 300 Rep 3,969 Posts Drives: '08 335i Join Date: Jul 2008 Location: JAX iTrader: (6)	It doesn't matter from an acoustical standpoint. If you have Hifi, the woofers are 2ohm, so putting them in series will result in a 4 ohm load for the amp. In L7, woofers are 4 ohm, so parallel will result in 2 ohms. HD900/5 sub channel can drive 1.5-8 ohms, but output will be reduced at 8ohm, which may not be a bad thing considering you are driving OEM subs. Be very careful, this amp will smoke those woofers in a heartbeat! __________________ Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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08-31-2013, 11:38 PM	#5
ctuna Lieutenant General 1911 Rep 13,104 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Here is a bunch of stereo info for the stock system Here is a bunch of stereo info for the stock system BMW stereo types http://www.e90post.com/forums/showthread.php?t=352586 http://www.e90post.com/forums/attach...2&d=1266451970 http://www.e90post.com/forums/attach...2&d=1260829447 http://www.e90post.com/forums/showthread.php?t=343673 http://www.e90post.com/forums/showthread.php?t=138949 http://www.e90post.com/forums/attach...2&d=1260829447 http://www.e90post.com/forums/attach...1&d=1209780605 http://www.e90post.com/forums/showthread.php?t=641323 http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/ http://www.e90post.com/forums/attach...1&d=1209780865 http://www.bawarec.ru/manuals/3er/e9...3er-e90-12.pdf http://www.musicarnw.com/page-2/ http://www.e90post.com/forums/attach...4&d=1278871872
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09-01-2013, 08:27 AM	#6
cdgatti Colonel 255 Rep 2,547 Posts Drives: e90 328i Join Date: May 2011 Location: KY iTrader: (4)	I would run 2 channels for the door mids/tweets and 2 for the under seats. You can run the rears off the head unit directly. Then save that hd900 sub channel for a real sub. __________________ OEM Black grill and Blackline tails - LCI halogens with Lux V2 coded as DRL - 3M Crystalline - BMS PBX - OEM Euro Airbox with K&N - Hardwired CTEK - Bilstein B6 w/OEM springs and SP perches - Conti DWS06 - HiFi-Helix DSP - JLAudio HD/XD-Morel - CD changer trim - AE optical out
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