Op-Amp Matching?

[Static1]

If you have an audio amplifier that uses a Dual op-amp(8-pin) and the ground channel has a single op-amp(8-pin):

Does or should the ground channel op-amp always be the same type(single version of the Dual op-amp used)? or can you use different op-amps for the ground channel ?

Thanks for any help.

 

[purplepeople]

What do you mean by ground channel? What does that single opamp do?

ensen.

 

[Static1]

The dual op-amp is for the L&R output channels(stereo). The ground channel op-amp for this circuit would be a single op-amp and usually be the single-version equivalent of the dual op-amp being used.

Example: you would use an OPA2604 for the L&R channels and an OPA604 for the ground channel.

So; I'm just wondering what the actual role of this "ground channel" op-amp actually is?, which is the same question you asked.

 

[name773]

do you have a schematic handy?

 

[Richard C]

Does the amplifier have a dual-rail power supply? If not is the 'ground channel' op-amp there to provide a virtual 0V rail?

 

[purplepeople]

Does this amp have balanced inputs?

ensen.

 

[peranders]

I'll guess it's PPA his talking about.
http://tangentsoft.net/audio/ppa/