I'm having a similar problem with my 'phones. Both channels operate, but right is clearly "louder" than left. They are HD600s, run off of the tape out of my pre to a Headroom Home. Same problem from both headphone jacks, problem remains the same when input cables to Headroom are swapped, so I'm guessing its the headphone amp. I'll call Headroom tomorrow, but I have noticed a similar (but to a lesser degree) problem with my overall system. Could it be the CDP (CAL CL-10)? Hard to imagine that could be the case, but maybe I'll try swapping the outputs from the DAC, or running the analog output from the CL-10 internal dacs direct to the pre. Maybe its due to coriolis force; anyone down under have reverse problem?;>).