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<blockquote data-quote="Winter_C" data-source="post: 6346231" data-attributes="member: 613961"><p>Does HU preamp voltage matter? This question gets thrown around a lot and all too often, the answer given is “more is better.” Without any other information, this can’t be categorically stated as fact. A lot of the tests that I have seen for HUs with rated 4V outputs found that the HU simply didn’t make its rated voltage without unacceptable levels of distortion (10% in many cases) and/or without the bass or treble levels maxed out and then it only mad ethe rated voltage at the center freq of the boost. A HU with higher pre-out voltage won’t necessarily sound any better or allow a higher output from the amps. The fact is that the max pre-out voltage is only ever seen with the volume at max with a 0dB sine wave. If the volume is less than max or the level of the recording is less than 0dB (pretty much all music is well below that level) then the spec is meaningless. Combine that with the fact that most all amps will make their rated power with as little as 250mV and you can see that this spec isn’t that important. The only real benefit to a higher voltage signal is allowing the amp gain to be set to a lower setting and increasing the ratio of the signal to the inherent noise floor of the system. With good components, this noise floor is inaudible (the S/N spec is cited referenced to 1W, it increases from there) even with the amp gains maxed. HU preamp voltage is pretty much the last thing I look for in a good source unit. Outputs that don’t clip at max volume are much more important, and much harder to come by. For the purposes of being noise free, low output impedance is much more important than the rated voltage (which you’ll never see anyway).</p><p></p><p>ok...i dont really understand this, it seems this is aimed more towards people who have high-end amps? correct? which i will, but didnt plan on it instantly..guess i could though...and uh....how do you find:Outputs that don’t clip at max volume are much more important, and much harder to come by: That</p></blockquote><p></p>
[QUOTE="Winter_C, post: 6346231, member: 613961"] Does HU preamp voltage matter? This question gets thrown around a lot and all too often, the answer given is “more is better.” Without any other information, this can’t be categorically stated as fact. A lot of the tests that I have seen for HUs with rated 4V outputs found that the HU simply didn’t make its rated voltage without unacceptable levels of distortion (10% in many cases) and/or without the bass or treble levels maxed out and then it only mad ethe rated voltage at the center freq of the boost. A HU with higher pre-out voltage won’t necessarily sound any better or allow a higher output from the amps. The fact is that the max pre-out voltage is only ever seen with the volume at max with a 0dB sine wave. If the volume is less than max or the level of the recording is less than 0dB (pretty much all music is well below that level) then the spec is meaningless. Combine that with the fact that most all amps will make their rated power with as little as 250mV and you can see that this spec isn’t that important. The only real benefit to a higher voltage signal is allowing the amp gain to be set to a lower setting and increasing the ratio of the signal to the inherent noise floor of the system. With good components, this noise floor is inaudible (the S/N spec is cited referenced to 1W, it increases from there) even with the amp gains maxed. HU preamp voltage is pretty much the last thing I look for in a good source unit. Outputs that don’t clip at max volume are much more important, and much harder to come by. For the purposes of being noise free, low output impedance is much more important than the rated voltage (which you’ll never see anyway). ok...i dont really understand this, it seems this is aimed more towards people who have high-end amps? correct? which i will, but didnt plan on it instantly..guess i could though...and uh....how do you find:Outputs that don’t clip at max volume are much more important, and much harder to come by: That [/QUOTE]
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