I believe I see where you are getting hung up Amir. You are intent on getting 4Vrms into the analyzer. It appears that the designers did not account for your desire to test exactly at 4Vrms.
My desire? The whole world of consumer hifi has standardized on 4 volt output. Pro gear goes way above that. It seems like the AV manufacturers got together in a back alley and decided to shrink the output as much as they pleased.
I have $150 DACs that output 4 volt output designed by a single individual. When did this get "hard" as to want to relax the standard set in music world?
To get state of the art performance where you have true reference levels and dead quiet noise floor you need to go higher in voltage. Here is the Purifi Amplifier:
https://www.audiosciencereview.com/...easurements-of-purifi-1et400a-amplifier.7984/
Here it is with 4 volt input:
This is what happens when you disable the input buffer and gain drops to 12 dB:
You get 4 dB in noise performance.
Same is true of Benchmark AHB2 amplifier:
Best performance is reached in Low Gain that requires nearly 10 volts and you are advocating for even less output than 4?
Here are the specs for RME ADI-2 DAC:
That's 6.9, 3.46, 1.7 and 0.9 volts.
Why would the AV industry want to not only miss the Pro standard, but also dip way below consumer music standard?
You are new here but this is an old topic here. My stance is firm. If dirt cheap music DACs can produce 4 volts, the AV world better wake up to that as well. HTP-1 seems to be there by letting me input 7 volt sensitivity in the menu but clips way before that?
Now, if you could show me how I have saved $2000 by accepting lower output levels that would be one thing. But there is no evidence here. It is just a crappy design standard set among manufacturers. As reviewers, last thing I want to do is help them in that regard.