statman Posted December 20, 2012 Posted December 20, 2012 Hard to know where to put this, but very interesting read from an intelligent guy: http://www.stereophile.com/content/2011-richard-c-heyser-memorial-lecture-where-did-negative-frequencies-go He summed it up on final page by saying: Finally, looking back at the individual areas I have been discussing, it would seem that if you want to make and play back recordings that people will prefer, you use spaced omni mikes to capture the sound at at least 176.4kHz, and play it back through an NOS DAC, a zero- or low-negative-feedback amplifier with very low static distortion below 1W and primarily second-harmonic distortion at higher powers, driving large panel speakers via exotic cables. 1
Nada Posted December 20, 2012 Posted December 20, 2012 Thanks Statman for another very thought provoking thread. Id really like to hear Richard C. Heyser audio suggestions: use spaced omni mikes to capture the sound at at least 176.4kHz, and play it back through an NOS DAC, a zero- or low-negative-feedback amplifier with very low static distortion below 1W and primarily second-harmonic distortion at higher powers, driving large panel speakers via exotic cables I wonder where I can find recording using "spaced omni mikes to capture the sound at at least 176.4kHz" Then theres the gear. NOS DAC's are easy to find but what's an example of a " a zero- or low-negative-feedback amplifier with very low static distortion below 1W and primarily second-harmonic distortion at higher powers" ? Cheers
tuyen Posted December 20, 2012 Posted December 20, 2012 First Watt J2, SIT-1 and SIT-2 power amps are few examples I think http://www.firstwatt.com/pdf/prod_j2_man.pdf http://www.firstwatt.com/pdf/prod_sit1_man.pdf http://www.firstwatt.com/pdf/prod_sit2_man.pdf 1
Zaphod Beeblebrox Posted December 21, 2012 Posted December 21, 2012 Thanks Statman for another very thought provoking thread. Id really like to hear Richard C. Heyser audio suggestions: use spaced omni mikes to capture the sound at at least 176.4kHz, and play it back through an NOS DAC, a zero- or low-negative-feedback amplifier with very low static distortion below 1W and primarily second-harmonic distortion at higher powers, driving large panel speakers via exotic cables I wonder where I can find recording using "spaced omni mikes to capture the sound at at least 176.4kHz" Then theres the gear. NOS DAC's are easy to find but what's an example of a " a zero- or low-negative-feedback amplifier with very low static distortion below 1W and primarily second-harmonic distortion at higher powers" ? Cheers Any ME preamp or power amp will fit that bill. 1
andyr Posted December 21, 2012 Posted December 21, 2012 ... but what's an example of a " a zero- or low-negative-feedback amplifier with very low static distortion below 1W and primarily second-harmonic distortion at higher powers" ? Cheers AIUI, from talking to Hugh ("Mr AKSA") Dean, his Maya amplifier: has zero global NFB (but probably still uses some local NFB) has primarily 2nd-harmonic distorion at all powers. ... but I'm not sure it has "very low static distortion below 1w". I'm also wondering what relevance this factor is ... unless you listen softly, to very efficient speakers? Regards, Andy
andyr Posted December 21, 2012 Posted December 21, 2012 Hard to know where to put this, but very interesting read from an intelligent guy: http://www.stereophi...-frequencies-go Very interesting article - thanks for posting. Regards, Andy
Nada Posted December 21, 2012 Posted December 21, 2012 (edited) "very low static distortion below 1w". I'm also wondering what relevance this factor is ... unless you listen softly, to very efficient speakers? Im sure others will be able to offer a better explanation but let me try and make something up! Say you have average efficiency speakers like 87dB at one watt. You listen at 3m to two speakers so one watt puts out about 80dB. Well that's quite loud for an average signal. Many of us listen to an average loudness less then 80dB. So most of the time with average efficiency speakers we only listen to the first watt. So the first watt is all important. Dynamic peaks also matter for impact. Some say each increase of 3dB takes double the watts, so if you want a clean peak of 107dB = 2 power of (27/3) = 500watts. Then again if you get some Zu speakers with an actual sensitivity of 100 you only need an 8 watt amp for that same peak. Edited December 21, 2012 by Nada
ophool Posted December 21, 2012 Posted December 21, 2012 I enjoyed the read too, thanks for posting the link.
Nada Posted December 21, 2012 Posted December 21, 2012 (edited) How about posting your suggestions for gear that fit the specs for putting this dream combo together: Source: NOS DAC with high sample rate capacity Preamp: nil negative feedback, A Class Power amp: nil negative-feedback with very low distortion below 1W and primarily second-harmonic distortion at higher powers Speaker: large panel Cable exotica: Source: Preamp: Power amp: Speaker: Cable exotica: Edited December 21, 2012 by Nada
statman Posted December 21, 2012 Author Posted December 21, 2012 How about posting your suggestions for gear that fit the specs for putting this dream combo together: Source: NOS DAC with high sample rate capacity Preamp: nil negative feedback, A Class Power amp: nil negative-feedback with very low distortion below 1W and primarily second-harmonic distortion at higher powers Speaker: large panel Cable exotica: Source: Preamp: Power amp: Speaker: Cable exotica: My system 1 in my signature is as close as I can get, although I dont believe in exotic cables, short lengths of twisted pair solid copper seems very good with stats, cancels out most C which stats dont like. But in line with the lecture, I could be very well be wrong.
Nada Posted December 22, 2012 Posted December 22, 2012 My system 1 in my signature is as close as I can get, although I dont believe in exotic cables, short lengths of twisted pair solid copper seems very good with stats, cancels out most C which stats dont like. But in line with the lecture, I could be very well be wrong. Very nice. I guess that should make your third system with the 15" Tannoy's redundant according to the said lecture?
statman Posted December 22, 2012 Author Posted December 22, 2012 Very nice. I guess that should make your third system with the 15" Tannoy's redundant according to the said lecture? Yes I guess so, but Tannoys have been pushed aside in favor of involveaudio's electrostatic development kit, I'm all stats at the moment.
aechmea Posted December 22, 2012 Posted December 22, 2012 I can do the enormous panels. and also the no neg feedback ME pre and ME power amp (except that they are de-commissioned; but I haven't tossed 'em yet just in case).
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