Popular Post TomWoB Posted May 28, 2020 Popular Post Share Posted May 28, 2020 Hi all, old thead, but because of Qutest questions a few posts above and because of "Grounding" seems to be the major topic of this thread I will share my (short) experience with Qutest and ISO REGEN with you!. Odered on Thursday, delivered on Monday (not bad for California -> Switzerland) my ISO REGEN is running now for 72 hours nonstop in my system, which consists of: Intel NUC7i3BNH (in Akasa fanless case) running Roon ROCK ISO REGEN Chord Qutest DAC Lehmannaudio Linear Headphone Amplifier (Revision II) I have no SMPS in my complete system. The Linear Amp has a build in LPS (which is grounded), the other three components are all powered by an own Sbooster LPS. All power cables are plugged into an Isothek EVO3 Sirius mains distribution block. Grounding The LPS of the Linear Amp is internal grounded with the shown RC-part (for DC it's a 100 Ohm resistor to Earth). Via the analogue RCA-cable the Qutest is grounded too. I measured 100 Ohm from Coax-Input of the Qutest to Earth (as expected). Because of galvanic isolations and because of Sbooster DC outputs are not grounded (see Point 1 of Sbooster FAQ), I have two independent floating components in my system: Intel NUC running Roon ROCK (NUC network is also galvanic isolated by a Pinkfaun LAN isolator) ISO REGEN Does this system work? It works perfect! It's absolute stable: in the last 72 hours I never had a drop-out I never had a lost connection I can touch all cables, Qutest, ISO REGEN or Intel NUC without any effect Power consumption of ISO REGEN I measured 300 mA on the DC input of the ISO REGEN, this is exact what is expected, because: Alex C. said IR consumes 240 mA (link) Rob W. said the USB input of Qutest (USB decoder and isolation circuitry) consumes 60mA (link) Really no problems? Yes, there is one problem, the USPCB adapter is not working. My first setup was with the USPCB adapter and Roon can't see my DAC anymore .... argh ... shit. So I changed the adapter with an USB cable -> everything OK. Inserted adapter again, tried with GI switched off/on on IR -> not working. Once it was working for 10 minutes ... than DAC was lost again. So, it looks like that my USPCB adapter is "somehow working" but very, very unstable. For me not a big issue, because as a "cable freak" I prefer anyway "real cables". Now I use two Audioquest Carbon USB cables on input and output of ISO REGEN and I'm absolute happy with them. ... and ... how does it sound? I will not "finally rate" the sound already, because I think ISO REGEN is still burning in ... but it sounds really fantastic 👍. I think I have to update one of my other threads sometimes (link) 😁 ... kennyb123, Superdad and soares 2 1 Link to comment
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