Oldears, "asynchronous USB" refers to an interface between a computer and the USB input of a DAC. When the Oppo player is used to play files that are on an external hard drive that is connected directly to it via USB, the Oppo can be thought of as acting as the computer, with the computer-to-DAC interface being internal to the Oppo, and implemented in a different and more simplified manner than USB, asynchronous or otherwise.
As to how results would compare between playing a file from a computer into the BDP-105's USB DAC input, and playing the same file from a hard drive into a USB port on the BDP-105, that would be dependent on many design variables involving both the player and the computer, and perhaps even other parts of the system which might be affected by computer-generated RFI or digital noise. I doubt that the answer can be determined without trying it both ways in your particular setup.
Regards,
-- Al
As to how results would compare between playing a file from a computer into the BDP-105's USB DAC input, and playing the same file from a hard drive into a USB port on the BDP-105, that would be dependent on many design variables involving both the player and the computer, and perhaps even other parts of the system which might be affected by computer-generated RFI or digital noise. I doubt that the answer can be determined without trying it both ways in your particular setup.
Regards,
-- Al