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In Reply to: RE: Do any phono preamp manufacturers spec imd? posted by Triode_Kingdom on October 21, 2024 at 10:14:55
I don't know why imd testing of phono stages isn't more common and less talked about. It seems too bad. The more info the better if you asked me. I did find a link re MP-7 (non B model) tested imd.
Follow Ups:
"I did find a link re MP-7 (non B model) tested imd."
I don't know how to compare that method of testing (18kHz/19kHz summed carriers) to my own. However, the 2nd order IM product at 1kHz was a whopping 3%.
Did you notice the huge discrepancy in the THD numbers between the manufacturer's spec and the test lab? Darlington Labs states <0.01%, but the lab measured <0.0006%. This makes me wonder if one of these used a reverse RIAA in taking the measurement, but the other didn't. That's one of the problems in measuring phono preamps, the EQ gets in the way.
Honestly, I don't know why any company would use FETs in a solid state phono preamp today, unless it's purely marketing. The noise floor and distortion of several modern operational amplifiers are so low as to be almost impossible to even measure. These are dedicated devices that have been refined for decades, and they require almost no secondary engineering on the part of the equipment manufacture to maintain the specs.
Whatever the case, I just stick to tubes and passive EQ, and call it good. That eliminates most of these gremlins. :)
For sure. It's like the wild west. That makes life very difficult for consumers trying to make meaningful measurement comparisons. I often see references to ancient IEC phono preamp measurement standards. Since those cost money, I may never get to read them. But do any modern manufacturers or reviewers even adhere to a set of standards when testing? It kind of seems like many just march to their own beat, maybe even make some stuff up and often failing to adequately reference the result, making it impossible figure out what it means.
Absolutely right, and all the junk coming from China has only made it worse. For my own gear, I either refurbish vintage equipment or build my own. Can't trust any of the manufacturers' claims now that the FTC has stopped regulating this industry. I suspect it will get a lot worse before it gets better.
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