Hi, bought this amp as new old stock last week. Worked fine for a few days. After leaving switched on unused for 3 or 4 days I noticed the protection light was red. Powered off to reset. Protection now remains off but the right channel is distortred and lower volume than left. Treble not too bad but bass sounds like the speaker woofer is knackered ( it's not). Thanks for your help.

Audio Players & Recorders - NAD - C370 2-Channel Amplifier