Would still like to know myself

Numerous double blind tests, specifications and electronic science says otherwise.

Amps driven within spec' and below their clipping point are indistinguishable if set up properly so switching op amp IC's is pretty pointless.

Listen to Beyer DT150s through my X7, sounds perfectly good to me.

To be fair to the seller, you replaced IC's - you could easily be the reason it no longer functions. It's neither his nor PayPal's fault.

Why an X7 and a USB sound card? The X7 is a USB sound card.

Okay :-) thanks!

Quick question. Using mine with Wharfedale 9.1 speakers, 6ohm like the Creative xm7 set. Some guidance says to set the amp output impedance to 4ohms whilst another says 8ohm. Advice?

Definitely 100% the ears your listening with :-)

A 'better' DAC is subjective and questionable.

Many thanks

With regards input selection, how does this work without using the app? E.g. if I have something on the line in, say a CD player, what input selection is set when the X7 is turned on? Does it default or 'stick' to what was last set, what if power is completely disconnected? Is there any way to...

Your opinion. Mine is the opposite, sound is great, digital processing is top notch, no bugs, great functionality.