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SS & Tubes I understand. Class A, A/B I understand. But a digital amp? Does it only amplify the digital packets and not the "space" inbetween? Does it require digital input signal? If it outputs in packets how do speakers react to the signal? Or as I suspect is a digital amp just another marketing ploy to squeeze more dollars from sudiophools?
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I think of digital amps as they way Tact Audio describes one of their amps:"They are D/A converters that just happen to put out enough current and voltage to drive speakers directly."
This alows volume control and source switching to be done in the digital domain where the losses might not be as much.
All of the signal amplification happens in the analog domain. The technology used to amplify the analog signal is called "digital" because of its on/off nature--pulse width frequency modulation, or something like that. Don't ask me to explain. The Spectron website also has some technical explanation, www.spectronav.com.
Sorry I cannot describe its workings, but I can tell you what it does; "00100010111100101000111100010101001010101010101100010101 ..."
Zene
Phil, best thing I could say is go to PS Audio's site and read what they have to say about their implemented digital technology in their amps. They have a fair amount of info on how it works. I have a GCA-100 and really like it.. To be fair I also have a pair of SET mono's for tube duty. Although have not run them in months. The digital amps are claimed to be around 85% efficient by PS,, run cool,,
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