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Old 15th November 2008, 01:26   #1
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Default 2 Subs with One 4 channel Amp?

someone is interested in buying my pio svc sub.
he already has another pio sub. any idea if 2 subs can be run off one amp?
the amp in question is a sony 504. he doesnt need the pinnacle of sound quality but is it possible theoretically? can one amp power 2 subs? any special wiring changes?
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Old 15th November 2008, 08:35   #2
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Originally Posted by frankmehta View Post
any idea if 2 subs can be run off one amp?
the amp in question is a sony 504. can one amp power 2 subs? any special wiring changes?
Oh he can bridge both the channels, provided both channels have an LPF filter.
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he doesnt need the pinnacle of sound quality
Well, that's a good thing, because he's going to be pretty far away from the mountain, lol.
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Old 15th November 2008, 18:33   #3
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aight. thanx! but the sale went bust, cos only 2 channels of the amp had an lpf filter.. sad!
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Old 16th November 2008, 12:03   #4
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Originally Posted by frankmehta View Post
aight. thanx! but the sale went bust, cos only 2 channels of the amp had an lpf filter.. sad!
What would happen if he switched all the filters off & drove the subs? The subs would receive the high frequencies & not be able to play them efficiently & probably sound a little worse than if there were lpf filters in place. But I'm sure they wouldn't go bust or something. Also, is there any scope for setting the LPF on the head-unit? In which case, could a Y-splitter be used to carry the already LPFed signals from the head-unit to the 2 bridged channels of the amp?
Frank, if any of this works, and you manage to make the sale, I hope you will remember me.
Only joking.
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Old 16th November 2008, 15:50   #5
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What would happen if he switched all the filters off & drove the subs? The subs would receive the high frequencies & not be able to play them efficiently & probably sound a little worse than if there were lpf filters in place. But I'm sure they wouldn't go bust or something. Also, is there any scope for setting the LPF on the head-unit? In which case, could a Y-splitter be used to carry the already LPFed signals from the head-unit to the 2 bridged channels of the amp?
Frank, if any of this works, and you manage to make the sale, I hope you will remember me.
Only joking.

by bust i mean the deal went bust, not the amplifier..
nura, from what i know, 2 channels of an amplifier can only run one subwoofer and a y splitter cannot suffice for 2 subs on 2 channels..
the so called installer said there was no chance that the amp would be able to run 2 subs at a time and that would cause clipping of the amp as there was no mono mode.. these installers dont know a thing and comment on things they dont understand. this was the main reason why the buyer backed out.
despite that, i made the buyer talk to b&t, but sadly nothing convinced him. in the end he backed out. sad! the sub is still on sale on tbhp classifieds


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Oh he can bridge both the channels, provided both channels have an LPF filter.

Well, that's a good thing, because he's going to be pretty far away from the mountain, lol.

sir what if only 2 channels have lpf, and the other 2 have hpf?

Last edited by frankmehta : 16th November 2008 at 15:53.
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Old 16th November 2008, 17:16   #6
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then set hpf to off and control sub from HU.
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Old 17th November 2008, 11:00   #7
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Originally Posted by frankmehta View Post
sir what if only 2 channels have lpf, and the other 2 have hpf?
in that case only the 2 channels with LPF can be used to drive a sub. Can you bridged the 2 channels that have HPF?
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Old 17th November 2008, 14:36   #8
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This, using a 4 channel for 2 subs was very common earlier because the Pioneer 944 4 channel produced decent juice for the price.
Now, it's not a favored Idea anymore.
Driving a Sony 504 with 2 subs indeed is overkill if the guy has a loud listening tendency, then the amp will go into heat protect often. Sony build is inconsistent, some amps can drive 2 subs, some start overheating.
The LPF on only one channel part am not very sure, try conecting both subs and see what happpens. People putting 2 subs nowadays dont put Sony amps, the new 4 channel has not even as much power as it's predecessor the 504 or 444.
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Old 18th November 2008, 10:58   #9
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Sony build is inconsistent, some amps can drive 2 subs, some start overheating.
I have heard teh Kenwood 8404 can manage 2 subs one for each bridged channel.
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Old 19th November 2008, 14:57   #10
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Can any1 help me with the setting on my pioneer head unit(6950). Can you pls explain wht does reverse sub On/Off and hrp ment for??
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