Fiio and NAD an audio match made in heaven, for me at least For those who have tried the NAD Viso HP50 I know they are not for everyone but they definitely work for me. I have been looking at the HP50's for 5 years but could never get myself to pull the trigger. Either they were to expensive or the headband designed turned me off. But finally thanks to a killer deal at $128.00 CDN it was time to pull the trigger. It took some work on the headband flexing it out to make them comfortable. But now after 15 hours of breakin they are comfortable for me and they sound amazing with my M7. Kind of makes me wish I bought these much sooner, better late than never I guess. In fairness I don't think my old A17 had enough power for these but the M7 has more than enough. I never thought I would find another pair of headphones that would work better for me than my P5S2's, trust me I have tried many time over the years. It also makes me very happy that I could buy such a great pair of headphones from a Canadian company. I have listened to a ton of british, japanese, chinese and european made headphones over the years. I never would have dreamed I would end up with Canadian made headphones, thanks so much NAD. Yes I know NAD was a british owned company initially but the HP50's are Canadian designed with much research for these babies taking place at the National Research Council facilities in Ottawa by Paul Barton. Okey enough Canadian flag waving, these headphones like most are not perfect but honestly they have the best synchronicity between bass, mid range and treble I have ever heard and I have listened to a ton of headphones. Okey back to the M6 and by extension M7 for me. They still need some work and hopefully Fiio will release new firmware soon. I know they just released new firmware for the M11 so I hope they get back to development for the M6/M7/M9.