I've modded my 01US starting here: http://www.diyaudio.com/forums/digi...usb-spdif-24-192khz-asynch-4.html#post1955840
I am listening to the IO-USD hooked to my M-Audio “Superdac” for a month now. This is by far the best I have heard so far with a DAC connected through USB (including the DacMagic). Although the E-MU sounds pretty good, it has still some uneasy edgy sound with longer listening. This is completely absent with the IO-USD – Superdac combo. This combo sounds very natural, open and with ease without any listening fatigue.
The Superdac is unfortunately not available/in production anymore for a long time. I have modded this thing in the past with a better external low noise stabilised PSU and better NS-LME op amps.
I see no use for a separate 5V for the IO-USD. My laptop has already a lo noise 5V on the USB port and the IO-USD is isolated from my audio set through the S/PDIF transformers, which are of pretty good quality. It are no cheap Chinese ones but Murata ones also used in pro gear (although made in China
).
The Superdac is unfortunately not available/in production anymore for a long time. I have modded this thing in the past with a better external low noise stabilised PSU and better NS-LME op amps.
I see no use for a separate 5V for the IO-USD. My laptop has already a lo noise 5V on the USB port and the IO-USD is isolated from my audio set through the S/PDIF transformers, which are of pretty good quality. It are no cheap Chinese ones but Murata ones also used in pro gear (although made in China
).
Hi Jkeny,
I have done so (it is an Asus EeePC 901 netbook) and I don’t notice any difference. The 5V has its own smps inside the EeePC. What amazes me is that, despite the standard Crystal S/PDIF receiver chip in the Superdac, measured jitter with a 11025 kHz test signal, is very low for a S/PDIF link: > -135 dB. But the Superdac has a dedicated input with a separate comparator and doesn’t use the comparator of the Crystal chip.
Also I don’t notice any difference when driving the IO-USB through ASIO or Direct Sound (WDM) with my JRMC music player. The drivers of the IO-USB work flawless with both. This was also a bit problematic with the E-MU drivers.
I have done so (it is an Asus EeePC 901 netbook) and I don’t notice any difference. The 5V has its own smps inside the EeePC. What amazes me is that, despite the standard Crystal S/PDIF receiver chip in the Superdac, measured jitter with a 11025 kHz test signal, is very low for a S/PDIF link: > -135 dB. But the Superdac has a dedicated input with a separate comparator and doesn’t use the comparator of the Crystal chip.
Also I don’t notice any difference when driving the IO-USB through ASIO or Direct Sound (WDM) with my JRMC music player. The drivers of the IO-USB work flawless with both. This was also a bit problematic with the E-MU drivers.
Maybe worth to mention is that the 5V of the Crystal S/PDIF receiver of the M-Audio Superdac is very sensitive to noise. With the standard wall wrath I get a whole bunch of 50 Hz (and its harmonics) related spurs in the jitter plot. These completely disappeared after I powered it with a good filtered and stabilised external PSU and did put some better (and bigger) Lo ESR Panasonic FC caps nearby the receiver chip.
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