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Old 17th October 2012, 02:04 PM   #7451
SY is offline SY  United States
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Guys, there's a thread in the Lounge for car talk. Keep it over there. At least two of you have been warned repeatedly about this and I'm ready to start handing out infractions if you insist on dragging this thread OT yet again.
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Old 17th October 2012, 11:48 PM   #7452
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I guess we have to turn in out tree-hugger cards if we still run class A or tubes and I guess I am guilty as the speakers I build are in the mid to low 80's in output. Do I get any credit because I use a CD player that uses less power than a PC based music server? Oh yea, by the time I add in the DAC and preamp it probably catches up.

Got lucky fixing my Creek. Glad as it is a pretty nice sounding little amp.
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Old 18th October 2012, 01:05 AM   #7453
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Your tree hugger card gladly accepted here. I just went from massiver tube monoblocs (8 el34s each!) to class D. And actually improved the SQ. Regards
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Old 18th October 2012, 01:15 AM   #7454
bcarso is offline bcarso  United States
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Your tree hugger card gladly accepted here. I just went from massiver tube monoblocs (8 el34s each!) to class D. And actually improved the SQ. Regards
What class D? Just curious.
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Old 18th October 2012, 01:26 AM   #7455
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Old 18th October 2012, 02:00 AM   #7456
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I would consider 2x8xEL34 to drive woofers as waste of power and other resources, especially when they want to be electrically damped. Class D amps drive them well. And subwoofer, too.
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Old 18th October 2012, 06:39 AM   #7457
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Just don't let that class D drive treble - that's an area where, in my view, class D has a looooong way to go yet.

Many are starting to be lacking in the midrange, but for bass, they will give analog amps a run for their money.
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Old 18th October 2012, 07:36 AM   #7458
dvv is offline dvv  Serbia
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I just finished reading the paper on frequency response requirements by Snow. They conclude that 60...10,000 Hz range will deliver most of what is required.

All I can say is that perhaps we need to reevaluate the criticisms we laid out for the original German DIN 45500 standards set (audio, Hi Fi), which stipulated that to be called a Hi Fi unit, something had to do 62 ... 12,500 Hz. It appears this is in good harmony with Snow's paper.

However, that paper is from the early 30ies. I would expect us to have learnt more and produced better quality audio gear by now, so in that view, I do not regard Snow's findings as conclusive. What does "sufficient" mean exactly? Would the results have been any different, and if so by how much, if the audio amp they used which produced 10% THD was exchanged for another producing no more than 0.1% or less? Their speaker system was within +/- 2.5 dB up to 15 kHz, but today, there are systems claiming no more than +/-1.5 dB in that same range; is the difference audible? Can it make a difference in listening all by itself?

All in all, a worthwhile reading, but I feel for informative purposes only. I prefer the classic 20-20,000 Hz measuring standard, because while it may well go outside the range of most instruments and most hearing, it does allow for improved phase response at the extremes.
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Old 18th October 2012, 08:44 AM   #7459
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I bought the ClassD Audio Spiral Groove mastering amp. Using it with Anedio D2 Dac and Paradigm Sig 1 v3 speakers. The amp is stunning in this application-real mastering quality and I am using classical cds which I engineered. Regards
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Old 18th October 2012, 09:47 AM   #7460
bcarso is offline bcarso  United States
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I bought the ClassD Audio Spiral Groove mastering amp. Using it with Anedio D2 Dac and Paradigm Sig 1 v3 speakers. The amp is stunning in this application-real mastering quality and I am using classical cds which I engineered. Regards
Thanks John! I was just reading about some of their LP equipment.
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