Hi All,
Firmware updates for the M51 are straight forward and must be carried out by your dealer. If you contact the dealer where you purchased the M51 regarding firmware updates, they can contact our NAD service department for the latest version and should be able to carry out the update within a matter of minutes when you take the unit to the store.
In terms of finishes, as the M51 is part of our higher end 'masters' series which is silver in its heritage, their are no current plans to release a black version.
Does anyone have any questions about the direct digital PCM/PWM conversion process?
Thanks,
Jack Fox
NAD Product Manager