just to say you that i have implant 2 singles Moon in the RSA XP7.
(Fit like a charm thanks to the leads )
Result Is GREAT.
Detail, warm and a great improvement in term of homogeneity compare to all other ic dac than i have used.
it's a high end product for sure.
i try too the hearth in a usb dac, but as it's link to an amp tube i find sound isn't enough dynamique.
So i'll order the sun to try it.
Concerning a test with the M^3, i have all at home to do it, but it's an Alo doube mini M 3 ( i don't know if we speak about the same mini amp) and there is not a lot of place to implant it.
some advises ?
As for your Earth HDAM not being dynamic enough, if IT isn't neither will the Sun, most likely, as the Sun isn't really more dynamic as such, but has a more enhanced bass and treble response. A bassier sound does not equate to being more dynamic. IMO, it is possible that the power supply in your USB DAC may not be feeding the HDAM enough ergs. Or an impedance mismatch between the DAC and the pre-amp.
I say this because I am experiencing clipping in my OPA Moon in my KHA II amp, as it's burning in at present with a PS that has a lower voltage transformer than I'd normally use and it's simply not providing the power needed. I had a bit of an evil streak in me this morning and gave the amp a damn good thrashing with some Tool!
My main power supply is feeding KHA I.5 and there is no such problem with the audio-gd BEAST power supply!
Which USB DAC are you using?