Get the most out of OEM Underseat Woofers

reddevil12 · 09-12-2011, 11:36 AM

I have installed Focal 100 VRS components in the front and a 10inch JL Audio Sub in the trunk but am currently using the OEM underseat subs at the moment. All are being powered by JL Audio XD700/5.

Can anyone suggest the best settings on the amp in order for me to get the best out of the OEM woofers until I upgrade to something else? I currently have the underseat woofers bandpassed on channels 3/4 (highpass is around 200, and lowpass is 80). Also, I have the gain set close to minimum (around 8 o'clock). I currently do not have a voltmeter so I can't set the gain according to the JL Audio manual. Thanks,

VP Electricity · 09-12-2011, 02:04 PM

The underseats are not subs. They are woofers. Subwoofers play 50 cycles and below. These need to play much higher to meet the 4" mid. They really don't play sub-bass.

I think you have your settings reversed. Your highpass needs to be around 50, and your lowpass needs to be around 200. Ignore the manual. Turn it until it sounds good.

Your risk is that you might blow those stock HiFi woofers, of course.

fdriller9 · 09-12-2011, 03:33 PM

I have my underseat woofers externally amp'd as well and haven't had any problems with them so far.

Lowpassed around 160hz and high passed around 60hz.

09-12-2011, 11:36 AM	#1
reddevil12 New Member 1 Rep 25 Posts Drives: 2008 E92 328i Join Date: Aug 2011 Location: NOVA iTrader: (1)	Get the most out of OEM Underseat Woofers I have installed Focal 100 VRS components in the front and a 10inch JL Audio Sub in the trunk but am currently using the OEM underseat subs at the moment. All are being powered by JL Audio XD700/5. Can anyone suggest the best settings on the amp in order for me to get the best out of the OEM woofers until I upgrade to something else? I currently have the underseat woofers bandpassed on channels 3/4 (highpass is around 200, and lowpass is 80). Also, I have the gain set close to minimum (around 8 o'clock). I currently do not have a voltmeter so I can't set the gain according to the JL Audio manual. Thanks,
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09-12-2011, 02:04 PM	#2
VP Electricity Brigadier General 289 Rep 3,201 Posts Drives: F34 xDrive Join Date: Jan 2008 Location: portland oregon iTrader: (3)	The underseats are not subs. They are woofers. Subwoofers play 50 cycles and below. These need to play much higher to meet the 4" mid. They really don't play sub-bass. I think you have your settings reversed. Your highpass needs to be around 50, and your lowpass needs to be around 200. Ignore the manual. Turn it until it sounds good. Your risk is that you might blow those stock HiFi woofers, of course.
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09-12-2011, 03:33 PM	#3
fdriller9 Banned 252 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	I have my underseat woofers externally amp'd as well and haven't had any problems with them so far. Lowpassed around 160hz and high passed around 60hz.
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