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An exellent example of what we normally try to avoid: uneven freq response, uneven directivity, high distortion with dominant 3rd harmonic

I think Hypex does that. They deliver a state-of-the-art power stage, and guys like Marantz add the preamp stage with their "signature" sound. Of course, in many cases that signature sound is more about adding some signature nonlinearity, basically ruining the overall performance :)

I think that button on the front panel is a Standby mode - low power consumption mode, 1.2W. So while in standby mode, AC is still coming to the power supply, and the power supply still delivers the +/-30V DC to the amplifier. The only way to shut down the AC/DC power supply in to unplug the AC...

The amp has no AC switch, I assume it will be ON for 24/7, if the average user is as lazy as I am to unplug the AC manually every time

Great performance! I'm just concerned about the long-term reliability. It seems like Topping uses 35V capacitors with 30V DC on them (60V from power supply / 2). What is the effect on MTBF? As a design engineer, I understand the choice. But if my company designs something to serve for at least...

Have you heard Totem before? I lived with Totem Sky (30mm Wavecor + 5inch Morel drivers, 1st order filter: 1 capacitor + 1 resistor) for 2 years and really enjoyed it. One year after selling it, I missed the sound so much, that bought I the same tweeter and built a 3 way DIY with the 1st order...

A bit harsh judgment:) I really like the sound of those Wavecor tweeters that Totem used in many models (I owned Sky). https://www.wavecor.com/Driver%20specifications%20PDF/TW030WA13_14_specifications.pdf The woofers look like Wavecor's 90mm fullrangers. I didn't hear this particular model but...

I think it's because of the strong directivity of 2 woofers at 2.5kHz frequency. When you mount the measurement mic at 1m on the axis of the tweeter, it's already off-axis for the woofers. You probably wouldn't hear this dip on-axis in a real room with a 2.5-3.5m distance from the speaker, but...

Do they run 7 PA chips in parallel for each channel?

Can you please make a separate review for that isolator? It might be the first USB accessory that actually works

I think this is more or less a standardized measurement, check how rtings.com does that. I just like the sound of the open backs. Didn't expect them to cool down my ears :) I use the headphones only during the walks. And big closed-back headphones like my Sony WH-1000XM4 are a no-go in his...

Ah, I thought it was a part of the test setup. Something like this: https://www.rtings.com/headphones/reviews/grado/sr80e-sr80

Do you measure a temperature rise for the ears? If not, what would you expect it to be? Is it realistic to get an open back version with comparable frequency response?

It depends on how he powers the array of drivers. I think you can get a nice radiation pattern if you feed them separately with the right phase and amplitude

Is there a beter way to rate the amplifier with one number as the alternative to SINAD at 1kHz? ''Good'' amplifier, SINAD 94dB ''Bad'' amplifier, SINAD 89dB

Purifi and Hypex have better multitone at 15kHz and I can definitely hear they play much cleaner in the that range. But for the rest you are right, most of the Texas Instruments based cheap class D amps measured excellent at 1kHz here don't have that overall feedback loop and, to my ears, only...

I like your way of thinking! Is there a possibility to play with the phases of these multi tones to get lower peak-to-average ratio and drain more current from the amp, as you say, push it harder?

Did you have chance to listen to Hypex or Purify amp? How does it compare to Cambridge? I like the measurements of CXA81 at high frequencies, but in real life the high freq content like cymbals sound much cleaner with Purifi.

I think the Multitone Test is even more representative. It not only shows the impact of distortion at different frequencies, but also IMD.