I have two powered Yamaha HS8 monitors, that I'd like to use to use for playback via USB from my Mac. A couple of inputs would be nice as well. I've seen products like this before, but they only have TRS outputs and no XLR outs. I have heard that XLR is superior to TRS due to grounding, and thus wanted to use the XLR inputs on my HS8s, but I can't seem to find any kind of USB Audio Interface that supports XLR out. Does this exist, or am I being stupid and should just use TRS? I need to run up to about 20ft of cable for each monitor. Thanks!
The TRS jack connectors on your speakers are electrically identical to the XLR ones. What matters is that the connection is balanced, not what type of connector is used. And, to be honest, on a Line level connection to a powered speaker, it doesn't matter THAT much whether it's balanced. If you haven't got a TRS jack to TRS jack cable handy (that's what is loosely referred to as a "stereo jack cable", though "stereo" is a misnomer in this case) use a normal TS jack cable. It will work just fine. If, and only, if there's a hum problem, lay out on a TRS jack cable.