QED's Reference Audio 40 stereo RCA to RCA interconnects are brilliant with a sound that is as neutral as I've heard. In other words, everything that goes into the cable, comes out of the cable. Naturally, I've tried other cables and all of them have added or subtracted something from the original signal. Usually, it's very subtle, but on a very good to audiophile grade equipment, the difference between cables can be heard. Highly recommended with 5 out of 5 stars.