Any opinions on the AMR Digital Processor 777 Dac?

Sorry Audiofun, just playing with you!
I actually admire your enthusiasm, and am interested in hearing the product.

Fla: It's all good :) I would like to know what you think when you hear it. Also if you get a chance to hear a Metrum Octave (only once it is fully broken in) you may be surprised what that little $1k box can do.., with the right USB/SPDIF converter.., if you are using a computer as a source that is :)

Audiofun, Have you tried Off-Ramp4 USB/SPDIF converter? Or have you compared your stand-alone USB/SPDIF converters to the USB port on the DP-777? The X-mos 2.0 USB chipset inside the DP-777 is very similar, if not identical to the one inside April Music Stello U3, but having a jitter-less internal I2S connection is much better than a USB-powered U3 with SPDIF interface. That being said, my Off-Ramp4 with Dual TurboClock and battery power supply handily beats the U3.

Yingtonggao: Hi, I have never had the privilege of auditioning an Off-ramp 4 or any Empirical Audio gear for that matter. I did compare my (former) Sonicweld Diverter HR and Kingrex UC192 to the USB port in the AMR DP 777. To be succinct it was the only time I preferred another interface to the Diverter HR. It is very good and though the XMOS chip is used it is not that simple. AMR wrote their own USB code, it is not licensed from wavelenth as so many others have done.

Also the I2S is a definate plus as it is one less conversion to be done.

The Diverter HR was close when feeding the HD-VDi input of the AMR but at the end of the day I thought USB direct in the AMR was best... that's why I sold my Diverter HR.

Having a direct USB implementation inside the DAC is superior (in theory) to an external box like the Stello U3. Converted USB can go direct to chip set as i2s without having the need to get converted from SPDIF again. SPDIF as you know is jitter-prone. XMOS chip set is the industry standard for asynchronous transfer and now used in most of today's asynchronous USB dacs/converters.