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    Making further progress, TOPPING’s new flagship amplifier will be launched in late May!

    B200 5W/4R THD10 0.00035% is not groundbreaking, just average ;)
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    Topping B100 Amplifier Review

    Those are not my words, I was just quoting. :)
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    Topping B100 Amplifier Review

    https://www.stereophile.com/content/two-new-ftc-rules "Previously, manufacturers measured power by driving their amplifiers at 1kHz and raising the power until the THD+N reached 1%. Now they must ensure that that standard is met at all frequencies between 20Hz and 20kHz, with THD+N less than or...
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    Topping B100 Amplifier Review

    Low dissipation BTL amp. Class D amplifier (E1,E2) driven low voltage power supplies of the Class B amplifier. (similar to Class A+)
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    Topping B100 Amplifier Review

    Load 8Ω: (OK) 8.9 Vrms / 10W ... 7 minutes of 50Hz signal Impossible with normal btl class-(a)b and that small heat sink. Total heat generated is 30W.
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    Topping B100 Amplifier Review

    When I simulate a single-supply (+38V) class-b BTL amplifier at 5W/4R I get 32W dissipation.
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    Topping B100 Amplifier Review

    The B100 has lower 10k-20k distortion than the Modulus. I have no idea how such low 10k-20k distortion can be achieved with a true class B topology.
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    Topping B100 Amplifier Review

    B100 has much flatter THDvsFreq graph than Modulus
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    Topping B100 Amplifier Review

    A loop probe (for an oscilloscope or spectrum analyzer) can help detect whether it is class-d or not.
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    E1DA Cosmos ADC

    https://e2e.ti.com/support/audio-group/audio/f/audio-forum/1080843/opa1632-thd-support-in-the-spice-model
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    Class B amplifier with SINAD of 120, how is that possible?

    I use few mA for better high freq thd (above 5kHz) Danhard usually uses one Vbe drop between bases, so not zero.
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    Class B amplifier with SINAD of 120, how is that possible?

    With heavily under biased OPS (1-2 mA per output pair, no emitter resistors) it's no problem to get THD1 -120dB. For low N you have to have low gain.
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    Topping B100 Amplifier Review

    That's not proof. Some understand class B and AB differently. I will ask differently. What is the quiescent current of the output transistors ? Are the emitter resistors present ?
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    Topping B100 Amplifier Review

    Any proof it's a true Class-B ? (e.g. output stage idle current)
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    E1DA Cosmos ADC

    IVX, don't make excuses ;), distortion is distortion, whatever harmonics are affected. On diya I showed a graph with bypassed caps vs stock, the THD 20Hz difference was 20dB. Cosmos is built for measurement, all the little things count.
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    E1DA Cosmos ADC

    SE/UNBAL 1.7Vrms input range, input caps bybassed -> 2.4mA DC flows to the source V1 ( 1mA when input range is 10Vrms) TI Application Report - Buffer Op Amp to ADC Circuit Collection...
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    E1DA Cosmos ADC

    Not only a higher capacitor value can help, but also the capacitor type and voltage rating. SE measurements, THDvF, 96k 24b, 1.7Vrms range Red trace - stock cap 220u/10v Green trace - Jamicon 470u/10v Orange trace - Hitano EXR 220u/16v Blue trace - Nichicon 1000u/10v
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    E1DA Cosmos ADC

    I already wrote IVX on diyaudio about input capacitor distortion. He claimed that my capacitors are faulty and I should replace them with new 220u ones. https://www.diyaudio.com/community/threads/cosmos-apu-a-notch-lna-70-to-outperform-apx555b-for-30-000.386001/post-7726875
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    E1DA Cosmos ADC

    PMA, have you tried a balanced divider for the SE output ?
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    E1DA Cosmos ADC

    I recommend replacing the 220u/10V capacitors with 470uF/16V (C1 C2 on my schematic). I personally use 1000u/16v, I get much better LF performance when using the SE input.
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