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Matching pre amp with power amp
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<blockquote data-quote="pwatts" data-source="post: 1167748" data-attributes="member: 146"><p>Generally speaking you want the preamp to be capable of running hotter than the power amp by at least 6dB but it's not universal. So if power amp needs 2Vrms for full power, preamp 4Vrms max.</p><p>Problem of preamp running too hot: blowing the amp and (possibly depending on architecture) excessive background noise</p><p>Problem of preamp running too cold: impossible to get full power of the amp. A preamp at max gain often also (once again depending on design) is prone to high distortion.</p><p></p><p>Another parameter to consider is impedance, a high output impedance (usually valves) may not like a low input impedance amp, but since valves distort more gently this is also not necessarily an issue either.</p><p></p><p>Usually unless there's major outliers there's seldom a problem with combinations and synergy is more important.</p></blockquote><p></p>
[QUOTE="pwatts, post: 1167748, member: 146"] Generally speaking you want the preamp to be capable of running hotter than the power amp by at least 6dB but it's not universal. So if power amp needs 2Vrms for full power, preamp 4Vrms max. Problem of preamp running too hot: blowing the amp and (possibly depending on architecture) excessive background noise Problem of preamp running too cold: impossible to get full power of the amp. A preamp at max gain often also (once again depending on design) is prone to high distortion. Another parameter to consider is impedance, a high output impedance (usually valves) may not like a low input impedance amp, but since valves distort more gently this is also not necessarily an issue either. Usually unless there's major outliers there's seldom a problem with combinations and synergy is more important. [/QUOTE]
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Audio and Video Talk
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Matching pre amp with power amp
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