@batvac2
I wonder how you can hold to your position when we consider your excellent integrated tube amplifier, the Ars Sonum. I have searched the 'net and can find no review of the Ars Sonum that provides detailed measurements of it. The maker provides very little by way of specs. So how is it possible to like it?
I suggest you do yourself a favor and send it to Amir for testing. Yes he tests some expensive components. He didn't like the Chord DAVE at all, yet it is a reference for some. I'm certain he'd be happy to oblige if you send him your Ars Sonum, for that's how he gets almost all of the units he tests.* The problem is that we all know that it would come out far behind the Topping LA90 integrated amp that he tested recently. The harmonic distortion specification of your Ars Sonum is about 4000 times greater than that measured in the Topping. The Topping SINAD is 30db better than the Ars Sonum s/n.** Amir concluded that the $900 Topping amp engineers "have outdone every amplifier I have measured . . . getting ahead to capture the #1 position with a large gap to #2 choice."
So for US$900 you can have it all, with a bit more power as well. Why would you continue to listen to all that noise and distortion from the Ars Sonum when the Topping is only $900 away? The answer probably is because you know that the Ars Sonum integrated tube amplifier in all likelihood sounds better than the Topping. And how it sounds is the only thing that really matters. Bottom line: isn't that where it's really at?
*Topping units, though, are all sent by the manufacturer. An ASR review is a evidently a major part of their marketing plan. The suggestion, therefore, that they are designed with Amir's testing in mind is not exactly off the wall.
**I concede these are not precise equivalents, but they are close enough.