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Flex, coax vs toslink vs usb 2 months 2 weeks ago #66271

HoJ76 Topic Author Offline Junior Member Posts: 25 Thank you received: 3	I have a Minidsp Flex rca version and I wonder if there is any difference in the sound between usb, coax or toslink input? I have tested my fanless pc (usb) and a WiiM Pro (coax) and there was more different in the sound than what a thought.
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Flex, coax vs toslink vs usb 2 months 2 weeks ago #66272

Tony_J Away Moderator Posts: 223 Thank you received: 88	I suspect it depends a great deal on what you are attaching to the Flex. My own experience is that I have failed to detect a significant/any difference among the various inputs, but YMMV.
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Flex, coax vs toslink vs usb 2 months 2 weeks ago #66273

HoJ76 Topic Author Offline Junior Member Posts: 25 Thank you received: 3	My fanless nuc sounds better thru usb than my WiiM Pro thru coax cable both using roon.
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Flex, coax vs toslink vs usb 2 months 2 weeks ago #66274

Tony_J Away Moderator Posts: 223 Thank you received: 88	Hard to say whether that is because of the inputs or because of differences between the NUC and the WiiM. I recently had my Flex 8 set up with 2 different R-Pi based streamers connected, one via Toslink and the other via coax, plus my PC acting as a third source via USB, and had a hard job detecting any differences in sound quality. The following user(s) said Thank You: HoJ76
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Flex, coax vs toslink vs usb 2 months 2 weeks ago #66275

HoJ76 Topic Author Offline Junior Member Posts: 25 Thank you received: 3	Strange, I have problems believing that one "streamer" is better than another "streamer" so my only answer would be that usb is better than coaxial on Flex.
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Flex, coax vs toslink vs usb 2 months 2 weeks ago #66276

Tony_J Away Moderator Posts: 223 Thank you received: 88	You need to do some controlled tests! Preferably ones where only one variable changes. The following user(s) said Thank You: HoJ76
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Flex, coax vs toslink vs usb 2 months 2 weeks ago #66279

Ultrasonic Offline Moderator Posts: 2887 Thank you received: 616	The video below may be of interest in terms of discussing some technical reasons that you might notice real differences. I've never tried comparing any digital sources connected to miniDSPs myself though.
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Flex, coax vs toslink vs usb 2 months 5 days ago #66380

onlyoneme Offline New Member Posts: 11 Thank you received: 1	@HoJ76 You can use the Flex to capture the input and pass thru the usb to the PC. This way you can compare the streams the DAC receives after ASRC is done. Technically usb input is going to deliver better performance as the stream is clocked with the DAC clock, and the Flex in not very good to handle the jitter of incoming spdif stream IMO.
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Flex, coax vs toslink vs usb 2 months 5 days ago #66381

HoJ76 Topic Author Offline Junior Member Posts: 25 Thank you received: 3	So this may be why the usb from pc sounds better than coaxial from WiiM Pro in my system?
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Flex, coax vs toslink vs usb 2 months 5 days ago #66382

onlyoneme Offline New Member Posts: 11 Thank you received: 1	I don't think so. There are measurable differences, but I doubt it can be audible. The WiiM Pro is quite good on its digital output regarding the digital stream. BTW, did you check the toslink output also?
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Flex, coax vs toslink vs usb 2 months 5 days ago #66383

HoJ76 Topic Author Offline Junior Member Posts: 25 Thank you received: 3	Not yet, I'm on holiday. Will check when I get home.
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Flex, coax vs toslink vs usb 2 months 5 days ago #66384

onlyoneme Offline New Member Posts: 11 Thank you received: 1	You've mentioned Roon, was your test made with Roon Ready FW on the Pro over RAAT protocol?
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Flex, coax vs toslink vs usb 2 months 5 days ago #66385

HoJ76 Topic Author Offline Junior Member Posts: 25 Thank you received: 3	Both roon app and WiiM app.
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Flex, coax vs toslink vs usb 2 months 5 days ago #66386

onlyoneme Offline New Member Posts: 11 Thank you received: 1	And being bit-perfect on the WiiM side achieved, ie. no EQ, 100% volume etc? Making a test with toslink output is crucial. For example the WiiM coax output is not isolated galvanically afaik.
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Flex, coax vs toslink vs usb 2 months 5 days ago #66387

HoJ76 Topic Author Offline Junior Member Posts: 25 Thank you received: 3	No eq, turned off volume control etc.
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