Christian,
The first thing that comes to mind is whether the amps, left and right, are hooked up correctly when using the LK-85's. There really shouldn't be any difference except at higher volumes. If you installed the cards yourself, I'd start looking inside the bass amp and checking things out just to be sure. I'm unfamiliar with the LK-85's having not owned one. I do remember though that when I looked at my Aktiv card documentation that the cards are amp specific. You can get mono cards that work in some stereo amps as well as mono amps. But not all cards work in all amps. If you purchased these used I'd check the documentaion to see if they are in fact compatable with your amp. Good luck and you can email me through Audiogon anytime. Maybe we can figure this thing out for you.
The first thing that comes to mind is whether the amps, left and right, are hooked up correctly when using the LK-85's. There really shouldn't be any difference except at higher volumes. If you installed the cards yourself, I'd start looking inside the bass amp and checking things out just to be sure. I'm unfamiliar with the LK-85's having not owned one. I do remember though that when I looked at my Aktiv card documentation that the cards are amp specific. You can get mono cards that work in some stereo amps as well as mono amps. But not all cards work in all amps. If you purchased these used I'd check the documentaion to see if they are in fact compatable with your amp. Good luck and you can email me through Audiogon anytime. Maybe we can figure this thing out for you.