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Truly I'm not trying to be argumentative, I think this is a critical point but its being wholly missed. And its not just language. The gap is too large for keyboard, perhaps it requires a bottle of scotch and 2 glasses. Sorry for the detour.

Its not preference.

The Heyser quotes come from from "Hearing vs. Measurement", Audio, March 1978. He may have published an AES paper on the topic. I was involved in the work on the first perceptual codecs for wireless, this is something different. This concept also differs from euphonic distortion. Your and...

I committed my career at one time to the scientific pursuit of audio fidelity but came to an aha moment decades ago that there is no absolute sound, no attainable reference. I posted the following to rec.audio in ~ 1993. It's quoted from the brilliant late Richard Heyser who summed it up best...

FWIW Room EQ FAQ

First post in eons. My advice is stay away from it. Stay away from Nuprime. The IDA8 was great for a while. Then the DAC malfunctioned badly and they sent me a new main board I had to replace myself. I did but the amp section sounded bad and measured very high in distortion. After 2 months...

Nice speakers you've got there, they were responsible for getting me into hifi in the late 70s. Below is the test report from Popular HiFi in 1976. Jim was playing on the wild side with a dead short at 10kHz. I completely redesigned my pair a number of years back, with instructions and test...

Of course Tom is right. This: https://www.audiosciencereview.com/forum/index.php?threads/audio-measurement-gear.113/page-12#post-153972 "I found it very interesting that I could improve the unbalanced mains noise by 10 dB by either using a much heavier gauge AC cord, or running a ground wire...

That was a great read, thanks for sharing it. Unfortunately the driver peak frequencies vary with angle of observation, so their simple notch filter approach (based on on-axis only) won't work well, it'll mismatch off-axis (see below). IME with a driver like this, it calls for a low Q broad...

Apos eventually repaid my purchase price to PayPal (5+ weeks after an RMA request and frequent prodding from my side) but made me pay return shipping despite their web site policy being otherwise (it was faulty, & I've never before received a consumer good with a rattling loose screw). I wrote...

I stated this product had a risk due to its very tight packaging and Topping's trend for insufficient testing as evidenced in other products reviewed here. I find when people start putting words in my mouth, the discussion is not in good faith, so I'm bowing out.

To your first point, that's really a false comparison. High SINAD is also a more worthy goal than sleeping naked in the snow. The point is that manufacturers perfecting excess SINAD while giving insufficient focus on reliability and product testing before release (as evidenced by user feedback...

In the absence of an engineering damp heat or thermal cycling chamber, an easy and reasonably useful predictor of reliability risk would be to play it overnight & then pop the lid and quick test temperature. In that absence, the extensive user community feedback here is most helpful. I...

Their policy is "We’ll provide a free prepaid return shipping label for you to return the defective items" and they accept orders from Canada but today claimed that they won't pay for return shipping of defective items from Canada but instead offer an in-store credit which is not stated anywhere...

@pma Hi Pavel, I make my own switch boxes and switch the ground along with hot (make before break) so only the one input hot and ground connect to the circuit. Depending on the situation, it can drop system noise getting rid of all those extra antenna feeding into the box, and can significantly...

Prior to SMSL SU-9N order, asked Apos Apr 2 if they had stock in US to send, I raised this as my preference They said yes Ordered within 5 hrs. It was shipped from China despite their earlier same-day communication Received it Apr 9. There was a wandering loose screw inside I requested an RMA on...

Prior to 9N order, asked Apos Apr 2 if they had stock in US to send, I raised this as my preference They said yes Ordered within 5 hrs. It was shipped from China despite their earlier same-day communication Received Apr 9. There was a wandering loose screw inside I requested RMA on April 11...

@pma Pavel, thanks for sharing these test results. It's good to get testing based on sound electrical engineering. Excellent quality aftermarket classII laptop power supplies can be had for $35, accomplishing the same as the isolation transformer. It completely eliminated any background noise...

I plug my phono pre out into a USB A/D connected to the PC. In windows select that as a source each time when listening to vinyl. I do the same with an external chromecast, plugged into an optical in to USB out converter. ESI U24XL ($120) handles both analog and optical in as inputs to USB...

RG dynamics studied this back in the 70s and came up with a phono preamp torture signal (page 25 here) of "an RIAA preemphasized 500 Hz square wave, passed through a single-pole filter (-3 dB at 60 kHz) and ending up with a rise time of I microsecond" The audacity manual here implies ~ 3ms is...