And power conditioners too. The electricity coming into my music studio is pretty noisy and there didn't seem to be much isolation of the audio components from my guitar gear.....just a lot of frustrating noise. I bought the Isotek EV03 Aquarius and it may have been the single biggest improvement in the performance of all of my components. The sound is much more dynamic with more presence. No more hum out of my SET tube amps. Ground loops disappeared because of the isolated inputs on the Isotek. Great piece of audio gear.