Quote: I am using a M-Stage with USB with my Sennheiser HD600. The USB section is good enough but it can be improved. I tried a Musical Fidelity V-DAC (mark I)which sounds clearer and more dynamic than the internal USB of the M-Stage. Instrument separation is better with the V-DAC.   I...

I have been using a HUD-MX1 with my Sennheiser HD600.   Powered by the USB: The sound is congested and lacks dynamics.   Powered by the supplied switch mode power supply: Slight improvement in clarity but still not up to my standard.   Powered by a very old laboratory regulated...

Quote: The presentations of the Stax and Sennheiser are quite different. The Stax gives a clearer, faster, more open and transparent sound. Its midrange is magical like the Quad ESL57 electrostatic speakers which I once owned. However it lacks bass weight and slam. The Matrix M Stage &...

I had a pair of Sennheiser HD650 paired with a Musical Fidlity V-DAC (original version), Lehmann Black Cube Linear clone (non branded, bought from China) headphone amp last year which I didn't enjoy, mainly because I found the combination having a dark, distant and laid back presentation. I sold...

The hum does not go away when I wiggle the signal cable, I have even changed the cable to make sure. The volume pot does not affect the hum, the level of hum is constant through the Quad 306 power amp and speakers.

I found the blue LED of my V-DAC is much dimmer than the green one when there is a music signal to the DAC, are all the V-DAC the same like mine?

There is no hum through the headphone outputs.   The signal cable is a good quality one made by Linn. Using the Linn signal cable, there is no hum from a Creek passive pre amp to the Quad 306 power amp.   My Blackcube clone was not made by myself, I will need to open the cover to find...

The headphone output of my Blackcube Linear clone is silent but when I use the line output to my Quad 306 power amp, there is a constant hum through the speakers. What is the cause of this hum through the line output? Could it be the body of the Alps pot not being grounded properly?