Years ago I had borrowed my brother's 2 Carver M500t amps with the MKII upgrade (done by Nelion Audio). I absolutely loved the sweet, powerful sound they put out so recently I purchased 2 Carver M500t amplifiers online with the sole purpose of getting both upgraded to the MKII mod. When I received the amps I verified they worked and immediately sent them directly to Nelion for the upgrade. When the upgrade was complete I picked up my amps and installed them in a bridged configuration (1 per channel) in my den. Now I cannot listen to my new system without a smile on my face. The mod is we