I think they are both wired to each other like a K290 in stereo mode. It would be the same as the K280's wiring method. I'm sure Fitz will chime in when he notices. The 75 ohms suggest that the two 150 ohm drivers are wired together in parallel, in each cup. P.S. That's a great deal, I'd jump on all three if I lived there. It would be a simple weekend project (not even that long, a few hours).
2/21/11 at 5:11pm