Any opinions on the AMR Digital Processor 777 Dac?

Fla, According to the AMR distributor, JA didn't measure all the parameters in the proper way. Plus, if you really believe in measurement, Benchmark DAC-1 has the best numbers you can get from any modern DAC. I still own my DAC-1 and believe for the money there's no better DAC, but here I am, spending 5 times the money to buy another DAC, expecting better musicality and worse measurements.

350 hours on my DP-777 now, and the sound starts to stabilize, the tubed SPDIF input sounds best so far, the USB input is nowhere close to its own SPDIF or my Off-Ramp4 (with dual clock and battery options) connected to SPDIF. I bought a Macbook Pro and it's slightly better than my optimized PC, but without Off-Ramp4 the AMR has no magic with PC or Mac. I'll report back after 500 hours, but I doubt the USB will ever catch up.

For me, there are only two reasons to buy AMR DP-777: the tubed SPDIF input and the classic DAC. All the other options (HD Dac, filters, volume, USB) are good to have, and works above average Hi-Fi, but not stellar.

Jeffga, as much as I like the DP-777 I won't give it A+ if I am a Stereophile reviewer. The Grace M903 is less of a DAC and more of a headphone amp, and it does the headphone amp job extremely well, I have no problem giving it A+, but will probably move it to the headphone and accessory section, not the DAC section.

Yingtonggao: Like I said, I cannot comment on USB inputs / playback. However, with the BNC input, it is stellar. One other thing, at 350 hours there is still significant sonic improvement that will occur. Mine has 900 hours and continues to improve (although not as much as the sub 500 hour improvements). I agree on the Classic chip setting...it is my preference (95% of my music is Redbook).

Jeffga, good to know the improvements at 900+ hrs. AMR website says 1000 hours, which is long but not as long as my ProAc Tablette Anniversary's one-year break-in. Have you compared the BNC to the AES/EBU? I don't expect any sonic difference but the BNC connectors are not tightly mounted on the rear panel, and it worries me with heavy digital cable dragging/bending the BNC connectors down. Actually you can easily waggle the BNC connectors with your fingers.

I have not tried the AES / EBU due to my transport not having that option (output). My digital cable is quite light so there doesn't seem to be any "pull." I tried a RCA to BNC "hardwired" digital cable (Stealth Varidig) and it was quite good (and did not need the adapter). However, my preference is the ASI Livewire digital cable (using the adapter). The sound is more dense / full...I think this is a system dependent issue.