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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: I think that Hervé is sincere--and he is a graduate engineer posted by John Marks on June 28, 2014 at 09:11:43:
I owned the darTZeel NHB-108's for 6 years, and now own the NHB-458 monoblocks.
some info I have from darZTeel on the monoblocks;
>>>>>>--no contact, nor switch, relay whatsoever in the signal path.
--no negative feedback in the input stage.
--no negative feedback in the output stage.
--there are "only three (3) discrete junctions (transistors) in the signal path per polarity, whereas in the 108 there are 6.......in terms of measured distortion, figures are similar as for the NHB-108. THD is kept below 1% audible threshold, while the most critical temporal distortion is completely absent from the equation".
--the main AC fuse has been replaced by a thermal breaker.<<<<<
this is from Fremer's review of the NHB-458 monoblocks;
>>>>>>>"Total harmonic distortion is specified at less than 1% from 7Hz to 77kHz. That's fairly high in today's solid-state world (though across that bandwidth it's pretty impressive), but Hervé Delétraz claims that THD "has nothing to do with musical performance." Like the darTZeel's original NHB-108 integrated amplifier, the NHB-458 has a zero-feedback, true open-loop output stage, so there's no output-impedance compensation (ie, Zobel Network). The specified output impedance is less than 0.28 ohm, 20Hz–20kHz.
Delétraz cautions that the NHB-458 is not suited for speakers with a nominal impedance of 1 ohm because of its low parts count: despite the high power, there are only four transistor pairs in the output stage."<<<<<<<<
these amps are quite amazing in terms of ridiculously low noise floor and lack of distortion. yet they don't sound like solid state or tubes, they sound like music.
mikel
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Follow Ups
- some information..... - mikel 15:33:59 06/28/14 (1)
- Thanks. (nt) - John Marks 11:22:20 06/29/14 (0)
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