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"I don't have any problem with the same DAC with 2 other pairs of headphones!"
That would lead me to believe that the USB port is not your issue. Did you try the same headphone/DAC combo on a different computer?
I am happy to test it if someone buys it. For now, there is not a single measurement showing the output of any DAC is improved by this at ifi. Surely it is easy to show that if it can do that. So be prepared for yet another device from them that caters to audiophile anxiety than reality.
The proper solution for USB noise issues is full galvanic isolation. You can get this in some high-end DACs and USB to S/PDIF converters.
Yes, Toslink will also work. And you could use the D10 that way.A Toslink connection should kill all noise issue of the USB, right? If so a USB to optical converter (like a Topping D10) would be the best solution.
Or can it be that USB noise is carried by optical cables?
There are various isolators on the market and not surprisingly an interesting range of prices and claims.A Toslink connection should kill all noise issue of the USB, right? If so a USB to optical converter (like a Topping D10) would be the best solution.
Or can it be that USB noise is carried by optical cables?
There are various isolators on the market and not surprisingly an interesting range of prices and claims.
I think most are based on the industrial ADUM chip. I haven't used one for many years.
For example,
https://hifimediy.com/high-speed-usb-isolator-480Mbps
That's one of the cheap ones.A USB to
Seems interesting despite the chip name ("ADD-HUM").
I won't take the risk before I see it tested by someone trustful though, given the price of this gadget.
From your description I conclude that the amplifier in the DAC oscillates when it feeds the 1more Triple Driver. I assume this DAC gets it power over USB. It could be that the supply voltage is not stable with this load and oscillates as well, and the ferrites on the USB cable tame this oscillation. If this is the case a better supply may be the best solution (use another USB port, try a port replicator). An elcap at the input of the supply voltage could help, but could also make things worse.