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http://www.gustard.cn/?attachment_id=12475&download=1

Topping D90SE Disassemble https://www.ptt.cc/bbs/Headphone/M.1624709833.A.2B5.html https://translate.google.com/translate?sl=auto&tl=en&u=https://www.ptt.cc/bbs/Headphone/M.1624709833.A.2B5.html

It looks like the D90SE uses Taitien crystal oscillators. Or I'm wrong?

Archel 2 TI 1652 Op Amp Based Design Audio Taper Potentiometer (A100K) Gain Switch (Unity Gain or 4x) 600 mWatt Per Channel @ 16ohms Archel 2 GMR TI 1656 Op Amp Based Design Alps RK163 Audio Taper Potentiometer (A10K) Gain Switch (Unity Gain or 6x) 1 Watt Per Channel @ 16ohms...

Me interested in the reasons for the discrepancy in the measurements of THD + N versus frequency (90kBW) from Amir and from @WolfX-700 ? https://www.l7audiolab.com/f/measurements-of-gustard-x16-9068dac/ I have a feeling that @WolfX-700 had the digital filter turned off.

Will you be measuring RCA input and multi-tone THD+N?

Price : A90 -> <= THX887 < D90 Schematic : composite amplifier with (discrete output or parallel OPA) + feedforward NB.

My Anedio D2 from the first batch. It sounds very good. For many years, using the desire to replace it with another DAC did not even arise. And it's not just the sound. It was generally designed perfectly and very logically: 4-layer PCBs, ultra-high-frequency digital transformers, gold-plated...

If we are talking about the apparent loss of sound from digital interfaces, then this is a defective product and the reason for its return. In this case, the inaudible of the influence of heat on the sound is not enough.

There is no doubt that the power system affects the parameters of the amplifier. But using standard approaches to the implementation of the power system, you can achieve any practically necessary parameters. The THX patents clearly define the composite amplifier and feedback design, which...

They all have very similar circuit design. And all are based on THX patents. For me, these are variations of one amplifier.

Description of the THX AAA headphone amplifier series: https://www.thx.com/wp-content/uploads/2019/10/THX-AAA-One-Sheet-9.23.19.pdf

It was possible not to raise the topic of an external relay attenuator, but other discrete controls did not fit inside the amplifier. It is clear that to obtain an additional 10.20 dB to the characteristics, other design approaches are required. We can say this is one of the approaches to...

If we consider a universal attenuator for a headphone amplifier, then you can use this: https://pl.aliexpress.com/item/32831375230.html Supports both balance and unbalanced connections. Does not require soldering a headphone amplifier. Of course, you need to check at the interference from the...

I bought the M500 before it became known about the technical heating issue. I think many have a similar situation.

Instead of the built-in attenuator, you can use this one: https://www.ebay.com/itm/DACT-Type-SMD-Stepped-Attenuator-21-Step-Volume-Control-100K-Replace-Accessories-/274146774142

I did not pay attention, since the interface does not indicate that it is the SNR.

What is the value of M and fs for calculating the FFT process gain?

Thanks. Also interesting are the measurements for the DSD, since the RME ADI-2 Pro FS does not use PCM conversions to volume control. I think that it’s worth doing a separate test for the ADC.

RME ADI-2 Pro vs RME ADI-2 Pro FS