I am a happy user of the now discontinued Emotiva Control Freak volume control (rca version) in my desktop system. Desktop PC as source, into an ODAC usb DAC, into the Control Freak, into a pair of inline atenuators into a Quad 405-2 power amplifier into a pair of Harbeth P3ESRs. I added the inline attenuators because the ODAC's output voltage of 2.0V is a bit much for the Quad's 0.5V input sensitivity. Without attenuators there was a real risk of accidental damage to the speakers, and with the attenuators I also avoid potential channel imbalance at low volume settings of the Control Freak. Of course I have no way to measure, but the result sounds fine to me.