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Audio and Video Talk
General Discussion
External Power Amps and AVR challenging conventional Wisdom? Or Not?
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<blockquote data-quote="handsome" data-source="post: 1010394" data-attributes="member: 772"><p>Whats the point of offering pre-outs that can only drive 1.4V (or 1.1V with the internal amps on)? Granted most power amplifiers these days only need ~1V for full power but some power amps do require more.... and you <em>should</em> have at least 6dB of extra gain available: for one to be able to drive amps of a lower sensitivity and, more importantly for those films/CDs/files that aren't recorded at 100% volume. Suppose you want to watch a quiet movie at a decent volume?</p><p></p><p>Modern class B amps idle at about ~30mA compared to full power (e.g. 3.5A for 100W into an 8R speaker), which is insignificant for a power supply designed to supply lots of amplifiers at once. I won't pretend to know how switching amps idle but not delivering current into a speaker is not delivering lots of current</p><p></p><p>The fact that the tested AVR could only deliver 1.1V when connected to its own power amps seems to imply that either the power amplifiers input stages are somehow clipping and dragging the pre outs down (why?) or that there are no real pre outs and the signal is taken directly from the DSP chip/DACs which might have very weak output stages?</p></blockquote><p></p>
[QUOTE="handsome, post: 1010394, member: 772"] Whats the point of offering pre-outs that can only drive 1.4V (or 1.1V with the internal amps on)? Granted most power amplifiers these days only need ~1V for full power but some power amps do require more.... and you [i]should[/i] have at least 6dB of extra gain available: for one to be able to drive amps of a lower sensitivity and, more importantly for those films/CDs/files that aren't recorded at 100% volume. Suppose you want to watch a quiet movie at a decent volume? Modern class B amps idle at about ~30mA compared to full power (e.g. 3.5A for 100W into an 8R speaker), which is insignificant for a power supply designed to supply lots of amplifiers at once. I won't pretend to know how switching amps idle but not delivering current into a speaker is not delivering lots of current The fact that the tested AVR could only deliver 1.1V when connected to its own power amps seems to imply that either the power amplifiers input stages are somehow clipping and dragging the pre outs down (why?) or that there are no real pre outs and the signal is taken directly from the DSP chip/DACs which might have very weak output stages? [/QUOTE]
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General Discussion
External Power Amps and AVR challenging conventional Wisdom? Or Not?
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