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Matching pre-amp to power amp
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<blockquote data-quote="Veloce" data-source="post: 1117483" data-attributes="member: 16997"><p>Input sensitivity as stated is around 1 to 2 V for most power amps for a full power output. Most Power amps have a high input impedance around 100k ohms and most pre amps have a low output impedance, some at 100 ohms and some as low as 6 ohms. The high input impedance of the power amp is there so as not to load the pre amp and hence the combined impedance will be roughly equal to the pre amp output impedance. Assuming the pre amp has enough current to supply the stated voltage to its output impedance (and in turn, the combined impedance of pre out and power in) then I still see a voltage rating mismatch on most pre amps and power amps. </p><p></p><p>100 ohms in parallel with 100k ohms is still nearly 100 ohms</p></blockquote><p></p>
[QUOTE="Veloce, post: 1117483, member: 16997"] Input sensitivity as stated is around 1 to 2 V for most power amps for a full power output. Most Power amps have a high input impedance around 100k ohms and most pre amps have a low output impedance, some at 100 ohms and some as low as 6 ohms. The high input impedance of the power amp is there so as not to load the pre amp and hence the combined impedance will be roughly equal to the pre amp output impedance. Assuming the pre amp has enough current to supply the stated voltage to its output impedance (and in turn, the combined impedance of pre out and power in) then I still see a voltage rating mismatch on most pre amps and power amps. 100 ohms in parallel with 100k ohms is still nearly 100 ohms [/QUOTE]
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Audio and Video Talk
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Matching pre-amp to power amp
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