I also have a slight difference between my two ears, and have the K3, but no SubRx (yet!).
I found a very nice pair of stereo headphones at Radio Shack that have separate volume controls. I'm not sure of the part number-- the only number I can find on my set is 06A08. MFJ makes a monaural set (MFJ-392B) with separate volume controls. Both of these headsets have worked well for me; however I prefer the stereo sound that can utilize the AFX in the K3. 73, Chuck Guenther NI0C K3 s/n 1061
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