Sadly, Coby is crap, and PQI's stuff looks like crap.
Only looking at these PMP devices as spdif source output for the ibasso D1 or other spdif DAC means that the quality will based on the audio file decoder and spdif bus to correctly implement quality biphase mark code signal with <1-10 ns jitter. It also depends on if they added in some DSP to the decoded audio signal you don't know about or can't turn off.
But, yeah, if you listen to them with the stereo out, that may produce fairly poor audio since it is from the comsumer grade DAC and AMB. That is why we are looking for these devices in this thread with spdif so we can use an external DAC and amp. I view these purely as sources. All I really want is
This is probably a stupid question, but would it be possible to attach a device with usb host capabilities to the ibasso (with a usb cable) and play music? Sorry if this is too far off topic.
Yeah, that is a good question, which Kramer asked in another thread, but where I don't remember. The main problem is the USB host specification requires the host to deliver current to power USB devices. For a cumputer plugged into the wall or a laptop with a huge battery that is no problem. This would quickly drain the battery of a DAP if it was used as a USB host for any length of time. I think this issue came up with the Pico.
See the recent announcement by Wadia, covered at Stereophile, that reveals that current generation iPods (Classic, Nano 3G, some others) can output SPDIF digital to any device with an Apple "authentication chip."