![]() ![]() I am battling the lows in my system for years. I have just tested the Topping HS01 in my system.įirst, I did not believe that I have a ground loop issue in my system.Įverything in my system is grounded and I hear no humming or hissing. So it must be a 'bit' of a challenge, to believe my observations. I know most people here are of the bit = bit tribe. I just wanted to put in my 2 cents about the HS01. Very easy to put though isolators or even to run via fiber optic (SFP transceivers are just two pairs of LVDS-they are not stuck delivering Ethernet!). If audio DACs all had USB 3.0 SuperSpeed inputs this all would be MUCH easier since USB 3 is two differential pairs-one for each direction. It's cheap enough so I ordered one and will have a look. While they might be doing some ground-lift tricks (ala some iFi Audio pieces), it seems a bit misleading for them to call it a USB "Isolator." So I strongly doubt that the Topping HS01 is delivering actual USB galvanic isolation (unless they found a cheap surplus stash of ICE08USB last cost on those chips were $50 each). We at UpTone did it (in our ISO REGEN) with the only existent (now 3 years defunct since Silanna stopped making) high-speed USB isolator, the Silanna ICE08USB. The above is why Intona had to go to great lengths with an FPGA (and their own written MAC core) to monitor direction of the USB data so that they could put it over isolators and do actual galvanic isolation of USB. The data does not begin to "become" audio-sample-rate digital audio until AFTER a full USB MAC processor (such as XMOS, etc.), when at that time, with audio-rate clocks it becomes an I2S signal.Īnd while the signal is still in USB form, it can not be passed through simple digital isolators (of any form: optical, RF, giant-magneto-resistive, capacitive, whatever) because USB 2.0 is bi-directional on a single pair of wires-and all digital isolator channels are uni-directional per bit (yes, you can get digital isolator chips packaged with more than one bit per package, but that does not help). I can confirm that the D90SE has no issues as my ipad plugged directly into the D90SE works without a hitch ).Ĭlick to expand.Sorry, but that statement makes absolutely no sense. I was merely running my ipad pro via USB into the U90 and then via I2s into my D90SE. ![]() Will get it down to the shop again to get it looked at but i am pondering what the pertinent issue is ( 2 failed units in a row ? I am starting to think if i did anything wrong? After all the first unit worked well for a couple of days whereas the replacement unit failed after a few hours. Unfortunately the new unit failed as well, it only played music for an hour or so before the USB port failed ( i am assuming that it is the case as when it was working, the optical output lit up - now even with different USB cables and sources, i am failing to get a USB lock and no output via optical, AES or I2S ). The shop that i got it from was kind enough to swap out a new unit for me. It stopped working altogether after a couple of days. ![]() I got the U90 in last week and while it worked well for a couple of days, i started getting drop outs in the USB signal. ![]()
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