2. amps-preamps
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Amplifier Input Impedance

Why are so many high-power solid state amps designed with such low input impedances. Doesn't that really low input impedance limit the range of pre amps that can be used? Are there technical reasons why designers make these impedances so low? Why not design your muscle amp with a really high input impedance so it will potentially work well with all pre amps?
stickman451

Showing 2 responses by almarg

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almarg
9,670 posts
 
02-11-14: Bombaywalla
How come Almarg hasn't spotted this thread as yet?? ;-)

02-11-14: Jmcgrogan2
Even the great and powerful Al needs a little vacation time every now and then. ;)
:-). Thanks, guys. No vacation time needed, though, as I'm always on vacation (i.e., happily retired).

Actually, I had spotted the thread. But having never designed an audio power amplifier, I can't speak knowledgeably about what the tradeoffs would be if a solid state one were designed with a high input impedance. Certainly it's readily doable, but I don't have a good feel for what the inevitable tradeoffs would be.

In addition to those tradeoffs, of course, as John and others have noted I don't doubt that in many cases a significant factor is a lack of motivation to provide compatibility with tube preamps.

Best regards,
-- Al
almarg's avatar
almarg
9,670 posts
 
John (Jmcgrogan2) & Bombaywalla, see what I meant when I said that "I don't have a good feel for what the inevitable tradeoffs would be." :-)

Thanks, Kirk. Good to see you here again.

Best regards,
-- Al
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