Glad you like it; lots of people here do. There are only a couple of products on the market that do what this does for the price. For myself, I’ve just read too many accounts of this particular product not working correctly, requiring frequent factory resets, etc. to consider it. I have no doubt that if it’s working properly it sounds just fine.I have just bought this unit NAD C658. I am absolutely clueless to your reviews. I have just finished setting the unit up. Got it acting as a Pre-amp to my Rogue Audio Magnum Atlas Power Amp. Turntable - Technics SL-1500 with the Ortofon Blue stylus, Yamaha CD-S2000 and speakers are KEF LS50.
The set-up process was a breeze with DIRAC LIVE and BluOS on my iPad Air.
The sound from the turntable, CD player and in-house server to my ears are clear sharp with good bass. I don't have any fancy words like most of these audio magazine reviewers.
My point here is, you can use all kinds of spectro testing equipments to test all these audio equipments. The bottom-line that matters is our individual ears on how we perceive the sound.
I LOVE the unit and I highly recommend to anyone who is looking for a pre-amp with streaming capability and a built-in DAC. I am also very pleased with the price point.
Unlike most of the audio media, the testing that goes on here is really about showing objective data and demonstrating the level of engineering in a product. This forum is not trying to tell anyone which electronics sound the best.