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Post by fr8dog3510 on Feb 10, 2017 13:13:12 GMT -5
Been searching and can't find an answer that I can understand. I see some amps like Audio Research and Pass have 100k Input Impedance. I was looking at the Emo SA-250 and it's 23.5k unbalanced. I realize price wise not apples and apples, but looking at the used market and trying to learn what the numbers mean.
What does this difference mean?
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Post by mgbpuff on Feb 10, 2017 13:49:19 GMT -5
It doesn't mean much. The only concern is if you have a tube preamp with a high output impedance. The amp input impedance to preamp output impedance should be a minimum of 10 to 1. Solid state preamps have very low output impedances so there is unlikely to be a problem. Tube amps with a cathode follower buffer also have very low output impedance. Basically the pre output impedance combines with the amp input impedance just as resistors in parallel. The preamp is designed to be flat over its frequency range working into its output impedance with an infinite amp impedance (pure voltage source). But real world amps have input impedance, so a 10 to 1 ratio is adequate and most audiophiles want better (that's why they're audiophiles) maybe 20 to 1 or over.
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Post by fr8dog3510 on Feb 10, 2017 15:57:48 GMT -5
OK thanks. I think my preamp is 180. It's a schiit saga.
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