Any opinions on the AMR Digital Processor 777 Dac?

Yingtonggao: That is weird, if it was an apple computer I would know the issue but in Windows I think it should perform the necessary sampling frequency change automatically with no third party software. I would say look in the audio setup to see if you somehow have it set to always send the datastream out at 96khz. Sorry if that is not much help.

One other thing you can try is to hit the AMR button on your remote control to put the unit back in factory default settings just in case something got changed.

I solved the problem by going to QuickTime player, and change the output to 16/44.1. Under Windows OS, iTunes is just a file manager for QuickTime, which actually plays the music. Now my DP-777 (USB) now recognizes 16/44.1 and decodes accordingly using its classic DAC; the sound is... better, but still not there. I was told iTunes convert 16 bit to 24 and back down to 16... don't really know where the myth is.

Other than the USB quibbles I also have problem with DP-777's bass, compared to my previous Dodson 218 DAC the DP-777's bass is both weak and veiled. I hope a full burn-in solves the problem (now 100+ hours) but from the reviews I read even after 500+ hours the bass is still not a strength of the DP-777.

I can honestly say that it is not really worth judging it before 500 hours, it changes that much. The bass is flabby and soft when new. I have broken 2 of them in and the units broke in identically. I have found the bass to be as good or better than any dac I have owned, it just sounds real. Some dacs do have a pistonic (artificial electronic sounding bass) but even when
I listen to Hardcastle Jazz series music the bass is represented perfectly. At less than 200 hours you have a good ways to go before you know what it can do. I remember my Metrum Octave with the Diverter HR was quite a bit better than the AMR until I go t about 300 to 350 hours on it.., then it was bye bye Metrum. Have fun.

Audiofun: thank you for your encouragement!

Other than burn-in, I notice the USB input sounds much worse than SPDIF. Before I bought the AMR, I was using Off-ramp 4 + Dodson 218, the PC/USB sounded extremely close to CD transport/SPDIF. But then the AMR arrived, transport/SPDIF sounds better now, CAS/USB sounds TERRIBLE! I break-in the USB input for a while already, and even tried the PC >> USB >> Off-ramp 4 >> SPDIF >> AMR, no matter what I do, if a PC is involved, the sound deteriorate significantly. AMR seems to hate my PC while my previous Dodson loved it, even a Benchmark DAC-1 USB sounds better directly from my PC.

Yeah, I am gonna buy a Mac mini sooner or later, but why is there such a big discrepancy between a PC and a transport? Does anybody experience this? Does USB input takes longer to burn-in? Can you eventually get USB to sound as good as SPDIF inputs?

Yingtonggao, try J River Media Center. It costs $50 but is well worth it. The other thing you want to do is disable kmixer in XP or upgrade to Windows 7 if possible.

Running JRMC on Win 7 here, optimized, into the DP-777, with superb results.