I was recently given the sub-woofer (only) for a HK 395 but not the speakers or the special wiring connection from the unit to the speakers. It would be a waste to throw out a good sub-woofer so, is there any way to wire another pair of non-HK speakers in to the system?
I can't recommend trying it. 2.1 systems are balanced around very specific speaker specifications, which include very very high, or low impedance levels. Placing a non brand speaker into the mix will probably work, but will quickly burn out the electronics due to incorrect power levels to the sub, and satellite speakers.