Question: No hdmi signal pass through if the unit in standby?   

Compatibility mode was not needed in the final ver of win 10 64-bit. the M51 driver worked right away. 

Wrong! just updated to win 10 and the NAD M51 USB drive worked right away. no problems what so ever.

what a ZD?

Got an idea about adding a tube pre after the M51 and before the power amp. anyone had this config? thankful for any useful input .

Don't mind the size , Use FAT32 formatted stick .. updates problem free.

No probs =)

Hello Sonic Defender The  M51 Firmware update instruction PDF is provided with the update in the same zip file that you download from NAD website. and to make it easier for you: first you go here and download the update...

My friends call it Darth Vader

I bought 2 from a friend who was moving and didn't have the space for them. the other one is still in the box I can sell it to you if you want.

Is this still an M 51 thread ? If yes then here is mine with its original power cords  

What's wrong with the original one and how (in which ways) another one could deliver any improvements?   I'm just interested

  I don't know the technical term , I bought mine from a friend who was moving to a smaller place and didn't have the space for it.

Bummer. No one got any input about Dynavox ? -_-

  I agree After a long time fettling with the M51 I found that -20db is the sweetest spot.