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Amplifiers
What is the difference between a Profile amp and a McIntosh amp???
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<blockquote data-quote="thch" data-source="post: 4785013" data-attributes="member: 562032"><p>personally, i think its numerically a stalemate. if 24b of resolution is the goal, that would require noise/distortion to have on order of -150dBc effect. for 4V signals, this means noise on the order of 125nV begins to degrade performance "measurably". (not saying human hearing has a 150dB dynamic range over short periods of time) so in the numerical games, its harder to show that there is no difference in cables, as -150dBc isn't much. could any of these higher order effects (dielectric absorbtion, skin effect, piezoelectrics, ect...) provide a 120nV spike in noise?</p><p></p><p>disclaimer: the above makes a lot of assumptions that the source equipment, and other equipment, as well as the the source material and destination human are capable of noticing anomolies this small. it is very unlikely to be the case as many (all?) 24b ADCs do not have -150dB SNR, SFDR, IMD, or THD specs. likewise, affects of temperature may be significant on this scale.</p><p></p><p>it is especially unlikely that the speakers will have specs better then the cable, nor that the speaker's specs will not change over time significantly more then the cable. eg, it would need to be shown that preceived and measurable differences in sound are not due to small changes in the speaker that might occur during listening, or between listening sessions.</p><p></p><p>the listening environment also needs to be very close to ideal, as it will also color the sound.</p><p></p><p>The same would apply to the biological processes in the human ear and brain. for loud music, this is decidely unlikely.</p><p></p><p>my take:</p><p></p><p>the end goal is almost always user happiness. IMO there is no reason to say things seemingly as insignificant as cables can't cause the user to enjoy the system more.</p><p></p><p>but at the same time most people looking for advice will be looking for a max for min in terms of performance for an acceptable amount of money. and that places things like music-source (dvd vs cd vs mp3), environment concerns, speaker choice, enclosure and positioning choices, speaker blending and processing choices (the things that intentionally modify sound!) before smaller concerns like amplifier and cable quality. this is more of a modern thing as well -- if modern amplifiers were not as capable, the amplifier would again be of prime concern.</p></blockquote><p></p>
[QUOTE="thch, post: 4785013, member: 562032"] personally, i think its numerically a stalemate. if 24b of resolution is the goal, that would require noise/distortion to have on order of -150dBc effect. for 4V signals, this means noise on the order of 125nV begins to degrade performance "measurably". (not saying human hearing has a 150dB dynamic range over short periods of time) so in the numerical games, its harder to show that there is no difference in cables, as -150dBc isn't much. could any of these higher order effects (dielectric absorbtion, skin effect, piezoelectrics, ect...) provide a 120nV spike in noise? disclaimer: the above makes a lot of assumptions that the source equipment, and other equipment, as well as the the source material and destination human are capable of noticing anomolies this small. it is very unlikely to be the case as many (all?) 24b ADCs do not have -150dB SNR, SFDR, IMD, or THD specs. likewise, affects of temperature may be significant on this scale. it is especially unlikely that the speakers will have specs better then the cable, nor that the speaker's specs will not change over time significantly more then the cable. eg, it would need to be shown that preceived and measurable differences in sound are not due to small changes in the speaker that might occur during listening, or between listening sessions. the listening environment also needs to be very close to ideal, as it will also color the sound. The same would apply to the biological processes in the human ear and brain. for loud music, this is decidely unlikely. my take: the end goal is almost always user happiness. IMO there is no reason to say things seemingly as insignificant as cables can't cause the user to enjoy the system more. but at the same time most people looking for advice will be looking for a max for min in terms of performance for an acceptable amount of money. and that places things like music-source (dvd vs cd vs mp3), environment concerns, speaker choice, enclosure and positioning choices, speaker blending and processing choices (the things that intentionally modify sound!) before smaller concerns like amplifier and cable quality. this is more of a modern thing as well -- if modern amplifiers were not as capable, the amplifier would again be of prime concern. [/QUOTE]
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What is the difference between a Profile amp and a McIntosh amp???
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