SBGK wrote: > further update. > > I was still getting quite a lot of hf noise which I assumed was related > to EDO. Turns out it was due to the usb cable, even though I had cut it > down to 20cm and disconnected the ground and had tried another usb cable > which sounded the same. > > I had used wires from an ethernet cable to make up a cable to connect > the vlink 192 to the dac1 via xlr with pin 1 dropped to stop ground loop > issues and drain wire connected to the transmit end. > > So decided to make up a usb cable using this wire. It is 24 gauge cat5e > foil screen 4 twisted pair with drain wire. �1.49/m from Maplins. > > I connected the v+ and ground directly to the Touch board using 2 > untwisted wires, these were kept separate to the d+ and d- wires. > > I connected the d+ and d- wires to the usb a plug and the drain to the a > plug screen. > > then joined the v+, ground and d+,d- back up in the usb b plug. the > drain wire wasn't connected to the b plug. > > result - better dynamics, better detail, better separation, no > sibilance. In fact the best sound I have had out of the Touch. > > So the usb cable was rather a critical component in my setup. Don't know > if it was the quality of the cable or separating the v+ and ground from > the d+ and d-, but the effect is pretty big. mind you, if you look at > standard usb cable wires they are really thin, so that might have had > something to do with it. > > ps I tried various configurations using a twisted pair from a cat6 cable > and tin foil > > twisted pair, unscreened - good detail, open sound, bit hard sounding > twisted pair, foil screen - bit enclosed sounding, good bass, less open > than unscreened > twisted pair, foil screen connected to usb a plug - good sound > > final setup - cat5e cable, foil screen with drain wire (integral to > cable) connected to transmit end, used 1 pair and left rest > unconnected. > > http://www.maplin.co.uk/cat-5e-network-cable-ftp-solid-13246 > > also tried ferrites on the standard cable, that had quite a good effect > of reducing the hf noise as well, though I don't need them with the > above setup.
I'm surprised you are having such noticeable issues with USB cables... One the adavantages of "Async USB" should be to minimize/eliminate cable dependencies you may notice with "Adaptive USB"... Does you DAC support "Async USB"? ------------------------------------------------------------------------ leoduran's Profile: http://forums.slimdevices.com/member.php?userid=53189 View this thread: http://forums.slimdevices.com/showthread.php?t=94512
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