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In Reply to: RE: Amps for eminent technology LFT8bs posted by Davey on September 18, 2016 at 05:07:44
Grey = lack of tonal contrast or :"vividness".
The analog formats are inherently better at preserving short sharp transients in the sub millisecond range that can not be reproduced in CD but can be partially reproduced in 24/96 and rather well captured in DSD. In CD you can engineer a representation of the transients but not actually reproduce them.
http://www.themasterdiskrecord.com/.../ask-the-engineer.../
http://www.themasterdiskrecord.com/.../ask-the-engineer.../
http://www.themasterdiskrecord.com/.../getting-the-most.../
http://www.themasterdiskrecord.com/.../getting-the-most.../
Though these are not up to date entirely, the references experiments and discussion are worthwhile.
http://www.bodziosoftware.com.au/Attributes_Of_Linear...
http://boson.physics.sc.edu/~kunchur/align.pdf
Follow Ups:
It's easy to cherry pick stuff that agrees with what you believe.
Do you remember what I told you a few months back about believing everything you read? You're running off on a tangent again.
Anyways, you're connecting the dots from your previous statements. Explain how a preamp with 40V capability has any more inherent transient ability than a preamp with 4 volt capability.....all other things being equal. Keep in mind most power amplifiers are driven to their limits with less than 2 volts input. And don't respond with some strawman justification based on subjective characteristics.
Dave.
Depending on design, power amps have headroom for various length transients beyond the 2V for max rated power (driving a sine wave into a fixed impedance load), which is occasionally provided in the amp's specs as 20 or 200ms dynamic power rating. Some amps deliberately limit high voltage inputs and don't reproduce them. Most audiophile designs don't do that and no tube amps and hybrids I know of do that. So the 20 (or 40) V output preamp will provide the transients into the power amp and then some - in my amps the 10V output was plenty to deliver transients from my LPs, but they were marginally more distinct from the 6922 tube outputs rated 20 and 40V preamps, The main advantage beyond transient reproduction is for tube amps with minimal gain structures where gain may be as low as 22-24 db.E..g. some SETs with only input and driver may require up to 5 V for full rated power. As an aside, I have used tube phono preamps that had saturated the line inputs on my SS line stage momentarily. Didn't do so with tube pre at the setting for the same vol output..
Class D amps apparently have a hard limit.
In case anyone is wondering, the Music Reference RM-200 Mk.2 power amp works very well with ET LFT-8's. It has an input sensitivity of 1.1V for full output, but I don't recall it's gain. It puts out 100W into 8 Ohms from just two KT88/6550 tubes per channel, and not by running them hot or driving them hard. If you bi-amp the LFT's, the M/T drivers present a 12 Ohm/very even impedance load to the amp, a breeze to drive. If you don't bi-amp, the RM200 provides tighter-than-average bass for a tube amp, as good as many SS amps---Roger makes great output transformers. The amp also has a lower-than-normal for a tube amp output impedance, therefore doesn't roll off the top end of the tweeter.
Edits: 09/18/16 09/18/16 09/18/16
JA has done a full test on that amplifier. Click link below.
No doubt a 40 volt preamp will yield much better performance from it though. :)
Dave.
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