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New headphone amp - what chip? - Page 2

post #16 of 19
12/2/09 at 9:09pm
Quote:
Originally Posted by diditmyself View Post
Koyaan I. Sqatsi, I'm not clever enough to understand your question.
I was asking if you were referring to crosstalk via the supply rail or ground.

Quote:
My point is that a low impedance high quality active device used for virtual ground sounds better, measures better, could be made smaller and cheaper compared to a virtual ground à la CMOY where capacitors do the job.
Ok.

I agree with jcx that a rail splitter isn't what I consider a "three channel amp."

But yeah, if you're going to make a rail splitter like that used in the CMOY using just resistors and with the amp's output taken to the split point instead of through an output cap to actual ground, then yeah, you need to have some caps there to keep the supply impedance low.

se
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post #17 of 19
12/3/09 at 12:46pm
Quote:
Originally Posted by Koyaan I. Sqatsi View Post
I was asking if you were referring to crosstalk via the supply rail or ground.
via ground



Quote:
Ok.

I agree with jcx that a rail splitter isn't what I consider a "three channel amp."

But yeah, if you're going to make a rail splitter like that used in the CMOY using just resistors and with the amp's output taken to the split point instead of through an output cap to actual ground, then yeah, you need to have some caps there to keep the supply impedance low.

se
So maybe we all agree, and it's a matter of terminology: 2-ch, 2 3/4-ch, 3-ch, 4-ch, active ground, virtual ground, true ground etc.

I think a question nobody has answered is: is it better to separate VG from OG? From listening tests I don't think so, but I'm not sure. I think that's what you've been trying to say. Isn't it?
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post #18 of 19
12/3/09 at 3:05pm
Quote:
Originally Posted by diditmyself View Post
So maybe we all agree, and it's a matter of terminology: 2-ch, 2 3/4-ch, 3-ch, 4-ch, active ground, virtual ground, true ground etc.

I think a question nobody has answered is: is it better to separate VG from OG? From listening tests I don't think so, but I'm not sure. I think that's what you've been trying to say. Isn't it?
We seem to have been talking at cross purposes.

When you said three channel amp, I took you to mean an amp with an "active ground." Active ground as has been promoted by AMB and others refers to an un-driven third channel which the left and right outputs are bridged to and has nothing to do with rail splitters which is what it seems you were talking about.

However in terms of rail splitters, I'd opt for OG and VG being tied together. Grounding issues aside, separating them would then require that you cap couple the outputs.

se
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post #19 of 19
12/3/09 at 6:11pm
Thread Starter 
Ok, I guess I'll build a 6V or so boost converter and build the amp with an 8397 and see how it goes.
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