Lots of great recommendations here. If you want to squeeze as much performance out of your Qutest before the next big upgrade, I'd try a linear power supply, my Qutest responded nicely to the Sbooster, the extra filter thingy didn't seem to make any difference. I also think that the coax input sounds better than the USB.
DAC UPGRADE QUESTION
I currently have the following system:
1. Martin Logan 11A impressions hybrid-subwoofer with electrostatic panels.
2. Conrad Johnson Classic 62 power amp-60 watts per channel (not the SE )
3. Chord Qtest DAC
4. Lumin U2 mini streamer
Adding the Lumin and streaming with Qobuz has improved the sound immensely from my Cary CD player being used as a transport and the Qtest DAC.
The Qtest Dac was around $2000.00.
Looking for upgrade suggestions as thinking I can improve my sound further with a better sounding DAC.
Thank you.