I discovered these headphones in a desk we were cleaning out. ZALMAN MCH-MML 1000-HF. Are these decent headphones? They are certainly an unusual design, somewhat ugly, but very comfortable. I do not understand the headphone connection to an amp or a device. The three 3.5mm jacks are labeled R , C, and F. I certainly didn't see three plug ins on the amp I assume they were associated with. Is there a way to use these with a non-surround system, an adapter perhaps?