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I also compared connecting earlier Topping A90 as preamp. Sound changed minimally but bypassing it resulted in "cleaner" for me. Maybe configuration with Pre90 is another sound for ear.

I answered once but reread qustion. Low gain is also suitable. High Gain is just my preference. I think impedance (reactive part of it) proportion is fine. 30 may of 2022 I asked directly Bruno Putzeys via email with this question I got answer: Before this also were question from me. And...

Direct connection of SMSL SU-X to ET400 module is my configuration. I use this bundle. High gain.

So we need simply measurements for different impedances?

Aura 2 is more trusted.

KEF R3 Meta

I have ET400 board but no such problem.

I used it in pre mode too. But here everything is banal. A specific analysis and service are needed for a specific breakdown. This requires services, knowledge, tools.

Noise? I I do not have such problem. I own LE.

Sorry. I mean standmount

Nee wharfedales aura and new quad. Also electrostatic speakers.

Elac needs amplifier at least.

Why don't obvious? Genelec

KEF R3, KEF R3 Meta (not only ASR), Topping D90LE, Purifi Eigentakt.

Why adjustment to crossover point is significant change? It can be anywhere. But resulting frequency response matters. I mean what the difference in crossover point if frequency response is seamless? I do not see any crossover joint.

But from measurement point it is really interesting to know why sound of R3 Meta differs from original R3? Where is it on graphics? I mean real difference nor difference error or assumption.

Meta version do not have treble issues.

Yes. :) But you have guarantee and service.

Maybe you should wright here https://nordacoustics.co.uk/?

What specific device do you use? I can't see buffer bypass or turning on directly. Maybe I need to be more attentive. Blue colored PCB. I see Nord NC500 buffer.