Hello,
I currently have this setup:
PC > Keces 151 > WA3+ > DT990
The 151 and WA3+ sound good, but when I turn the volume all the way up on the WA3+ with no music playing, I hear a very feint FM radio interference. The other night I was hearing Kelly Clarkson Most noticeable are drums.
I never hear this interference except at full volume, I've never actually heard it during real listening, but I can't help but think its degrading the signal still.
It's definitely coming through the USB. If I turn off my PC, turn off or unplug the DAC, the radio noise is gone. If I skip the DAC and go from the PC's mini-stereo out to RCA theres no radio noise, but the overall sound quality is diminished.
The USB cable that came with the 151 has a ferrite core at the end, shouldn't that be helping?
I also have an Arcam A65 amp to B&W 602 speakers and I can hear the radio noise there too; although, the A65 is noisy at max volume so its much harder to hear above the hiss; Switching inputs on the A65 makes it go away.
Oddly enough, this shows me how powerfully resolving the WA3+ amp is, it's able to make a TINY radio interference signal sound crystal clear at max volume with no other hiss being added. Without the DAC its absolutely silent at max vol.
It might be moot since I have a DAC1 USB coming to me soon, but what do I do if I still hear this radio noise coming from that? My PC only has USB and mini-jack, so I'd have to get another soundcard to get an SPDIF output.
Anybody familiar with this?