Sub Hook-Up Question - Blu-ray Forum

Hawk · 08-17-2007, 12:23 PM

I am going to hook up a second Sub to my system, but my pre-amp has only one RCA Sub output. Someone told me just to use a Y-connector to hook both of them up. Does this in any way lessen or degrade the signal by splitting it?? Thanks.

HDJK · 08-17-2007, 01:08 PM

If you use a quality connector there shouldn't be any audible degredation. I do the same thing with my 2 K&Hs. If you received a microphone with your receiver you might want to measure your setup again (to detect possible gain loss and standing waves at listening position).

MatrixS2000 · 08-17-2007, 01:22 PM

The input signal will be dropped by 3dB, however, since you are adding a second driver, you will be moving more air. You can also increase the output of each sub amp. if you need more output.

Iceman_II · 08-17-2007, 01:45 PM

Are the Subs powered, if so, and you are splitting a pure "signal" output, and not a power output, not a problem.

Is your Amplifier driving the subs, then this is another situation all together. The concern I would have is that with the two subs in parallel, the impedance would be halved... not normally a problem, until you crank up the volume, at REALLY high volumes, you may find you are overdriving your amp, trying to push more Amps than the amp can safely push.

100W into 8 Ohms = 3.54A
100W into 4 Ohms = 5.0A
100W into 2 Ohms = 7.0A

Additionally, remember that sub-audible and very low base draw a LOT of power, much more than mids or highs, so while you may only nominally drive your mains speakers with a nominal 1W in a normal listening environment, the wattage driving the subs will be higher, depending on how much your like your subharmonics, sometimes, it may be MUCH higher. Crank up the volume, and I believe the the wattage increases geometricly with relation to sound pressure levels (SPL)

If your Amp has a protection circuit, it will only cause it to cut out when it overdrives, if not, you could damage your amplifier, with such nasty consequences as frying your amps power circuit.

Edit:
I would recommend using a separately amped sub circuit if you want to stack subwoofers

Hawk · 08-17-2007, 02:00 PM

Thanks for the advice. I am using powered subs. Two new SVS PB-13's with 750 watts per amp.

Iceman_II · 08-17-2007, 02:09 PM

Best way to go... enjoy

08-17-2007, 12:23 PM	#1
Hawk Active Member Member since:Aug 2007 Location:Chicago 4K collection:142 Blu-ray collection:622 Blu-ray reviews:1	Sub Hook-Up Question I am going to hook up a second Sub to my system, but my pre-amp has only one RCA Sub output. Someone told me just to use a Y-connector to hook both of them up. Does this in any way lessen or degrade the signal by splitting it?? Thanks.

08-17-2007, 01:45 PM	#4
Iceman_II Expert Member Member since:Jan 2007 Location:Ft. Worth Home Theater Gallery:2 Blu-ray collection:308 Blu-ray reviews: 4	Are the Subs powered, if so, and you are splitting a pure "signal" output, and not a power output, not a problem. Is your Amplifier driving the subs, then this is another situation all together. The concern I would have is that with the two subs in parallel, the impedance would be halved... not normally a problem, until you crank up the volume, at REALLY high volumes, you may find you are overdriving your amp, trying to push more Amps than the amp can safely push. 100W into 8 Ohms = 3.54A 100W into 4 Ohms = 5.0A 100W into 2 Ohms = 7.0A Additionally, remember that sub-audible and very low base draw a LOT of power, much more than mids or highs, so while you may only nominally drive your mains speakers with a nominal 1W in a normal listening environment, the wattage driving the subs will be higher, depending on how much your like your subharmonics, sometimes, it may be MUCH higher. Crank up the volume, and I believe the the wattage increases geometricly with relation to sound pressure levels (SPL) If your Amp has a protection circuit, it will only cause it to cut out when it overdrives, if not, you could damage your amplifier, with such nasty consequences as frying your amps power circuit. Edit: I would recommend using a separately amped sub circuit if you want to stack subwoofers Last edited by Iceman_II; 08-17-2007 at 01:51 PM.

Similar Threads
thread	Forum	Thread Starter	Replies	Last Post
Blu-ray hook up question	Home Theater General Discussion	mrnobudy	14	12-17-2011 06:53 PM
Quick question guy's? Hook up question	Receivers	xtreme02gt	10	01-21-2010 02:10 PM
Sub hook up question....	Subwoofers	ls7z06	4	10-26-2009 01:30 AM
3 Subwoofer hook-up question??	Speakers	rrios28	17	05-26-2008 04:57 PM
newbie question on hook-ups	Home Theater General Discussion	daniel2229	9	05-21-2008 06:58 PM

08-17-2007, 01:08 PM	#2
HDJK Blu-ray Guru Member since:Oct 2006 Location:Switzerland Trading Score:2	If you use a quality connector there shouldn't be any audible degredation. I do the same thing with my 2 K&Hs. If you received a microphone with your receiver you might want to measure your setup again (to detect possible gain loss and standing waves at listening position).

08-17-2007, 01:22 PM	#3
MatrixS2000 Power Member Member since:Mar 2007 Location:Toronto, Canada 4K collection:48 Blu-ray collection:305 Trading Score:6	The input signal will be dropped by 3dB, however, since you are adding a second driver, you will be moving more air. You can also increase the output of each sub amp. if you need more output.

08-17-2007, 02:00 PM	#5
Hawk Active Member Member since:Aug 2007 Location:Chicago 4K collection:142 Blu-ray collection:622 Blu-ray reviews:1	Thanks for the advice. I am using powered subs. Two new SVS PB-13's with 750 watts per amp.

08-17-2007, 02:09 PM	#6
Iceman_II Expert Member Member since:Jan 2007 Location:Ft. Worth Home Theater Gallery:2 Blu-ray collection:308 Blu-ray reviews: 4	Best way to go... enjoy

Best Blu-ray Movie Deals