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Chip Amps Amplifiers based on integrated circuits

Another LM4780 for Bi amping
Another LM4780 for Bi amping
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Old 7th July 2018, 12:32 AM   #11
MikeWhy is offline MikeWhy  United States
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Quote:
Originally Posted by tomchr View Post
Not necessarily. You can put a DC servo on a bridged amp and drive the DC offset to (near) zero if you wish.
Tom
I could, couldn't I? Feed it from the midpoint of the two amps and drive each half the distance? Or drive just one the full difference? Interesting.
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Old 9th July 2018, 04:48 AM   #12
PRR is offline PRR  United States
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Originally Posted by MikeWhy View Post
...Bridging always seemed a bad idea, although I've never seen any words written on what seems to me is a guaranteed DC offset. Any -- seemingly unavoidable, actually-- slight mismatch between the two amps or just a variance in gain puts a DC component across the speaker.....
All OCL amps have a DC offset.

For audio amplification we normally roll-off subsonic gain to unity, so "gain resistor match" is completely off the table.

I won't touch the idea of "bridging bad", except to point out two extremes:

Load offset doubles. But power output has quadrupled, meaning you probably have hefty woofers which will ignore tiny or 2X tiny offset.

Load offset *cancels*. This can happen (with good tracking even) in a monolithic dual.
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