georgehifi
Responses from georgehifi
| NAD M51 DAC high-pitched ringing? Has anyone bothered to see what happens after 20khz to the M51,s FR? Very strange for a dac or cdp, looks like the resonance of early metal dome tweeters. Have a look at the second graph and look what happens after 20khz up to 100khz. Ultra sonic... | |
| Help choosing an amp for Thiel 2.7s 06-19-15: Bdp24I just checked my Music Reference RM-200 amp, and it has 8ohm, 4ohm, 2ohm, and 1ohm taps! It's a very stable circuit, and a good sounding amp. And the only tube amp I can think of that would work with the load of the Thiels. Give Ro... | |
| Help choosing an amp for Thiel 2.7s The 2.7's have a nasty (2.4ohm at 160Hz)load, this together with whatever negative phase angle, could go even lower. This is probably why the Bel Canto's Class D's lost out in the lower mids, as below 4ohms Class D's usually cannot double.If you w... | |
| Better 2-channel music As Loomisjohnson said, just use the Oppo 103 direct into the power amps/s, it has all the outputs you need and use it's own volume control. Forget about buying another preamp just waisting money, the best preamp is no preamp, and you can do it wit... | |
| Did Redbook get it right? Milpai, I say Jon2020 has got it right.Especially if one has got it right using a Dac with old school R2R lader Multibit dac chips like the PCM1704 d/a convertors, not these far cheaper to manufacture bitstream (Deta Sigma, ESS ect) type of dacs t... | |
| Digital Contamination of the Power? Jon2020hi. Sorry to say but a power cord won't stop the digital noise or switch mode noise rubbish from entering the household wiring, and if your hi-end gear is close to it, the airborne rubbish as well. It emanates like a cancer through the wiri... | |
| Digital Contamination of the Power? Charles Hansen is right, anything with a smp powersupply can contaminate into the wiring of the house, and it's airborne efi as well. Do an experiment, tune a portable AM radio down low on the dial around 700khz, so there's no music and it's not m... | |
| Did Redbook get it right? Hi Clio, I use a Cary 303/200 which has the 24bit R2R Ladder PCM1704K chips, and it also has the PMD-200 HDCD filter as well as (switchable) copy of the DF1704 in DSP form.It also used OPA627 I/V which had feedback, but I completely gutted the I/V... | |
| Did Redbook get it right? Correct, I/V stages going back in the days of R2R Ladder Multibit dacs, were opamps with negative feedback, no matter how good the opamp was, the negative feedback couldn't handle the very high frequency glitches noise and other rubbish that came ... | |
| Did Redbook get it right? In my view Redbook did get it right, but it's only fully realized when played with correctly implemented R2R Multibit Ladder Dac convertors running with todays far better I/V stage setups.Not when Redbook is played through 1 Bit, Bitstream, Sigma ... | |
| Preamp/ amp repair recommendations in S. Fla? Any tech with tube experience will sort it out, as it is a simple design, here is the schematic less power supply you can give them. http://www.ys-audio.com/wce/counterpointsa5.1.JPGCheers George | |
| Placette RVC Depends on the gain of your amp and the output of your source. This is known as the "Bolero Test" You could try it from the direct line out of your source with no volume at all, but you need to use a cd to see how loud it's going to get, hence the... | |
| Krell FPB600 can it be bridge to mono So George is correct that in the event of a large and abrupt transient there will be some very brief instant of time during which the amp will not be operating in class A. I have no opinion regarding the degree to which that may be audibly signifi... | |
| Krell FPB600 can it be bridge to mono Looking at the size of the heat sinks of the new Gryphon's and the quoted Class A, I don't believe they could be pure class A, maybe sliding bias as well.There were ones going back 10 years that were huge and only 100watts total they could have be... | |
| Krell FPB600 can it be bridge to mono I don't think you could delay the signal so the initial plateau biasing can stay in front of it, without recording and playback either by digital or tape means, this would be even more detrimental to the sound quality.Back when I was building thos... |