wrote:
http://cgi.ebay.com/Kenwood-SP-930-c...QQcmdZViewItem

It's a good speaker. But doesn't the A/B switch control inputs
instread of outputs? It does on my Kenwood SP230 speaker.

I think this is incorrect in the auction: "For the DXer it has a
modification so that by selecting the A or B positions you can switch
from speaker to headset with the push of a button!" Unless some
previous owner hacked the circuitry.