From what you've said above, it sounds as thought you've got the K400's in a bi-wire configuration (ie. Two connectors on one end, and Four on the other) All you'll need to do is modify, or have it done for you, the one end of each speaker wire, so 4 connectors will exist and both ends, or all the wires are singley terminated.
Since you've had to pull the pre out to power amp in jumpers, I don't know that the Majik could still be used as an amp.....call Linn for that one (888)-671-LINN.
If it does, then just hook one set of speaker wires from both the left channels of the Lk85 and the Majik, and the other to the other channels. (keep the amps matched), then connect the wires to the speakers, after removing those little plates on the back of your speakers, you'll need the little wrench that comes with your speakers, or improvise as you'll have to pull off the gold covers on each terminal on the back of the speaker. Don't do all of them at once as many Linn crossovers are held in by these and then you've got to pull out drivers..... and match all the wires from amps to speakers!
As an aside, Linn recomends using the best amp for the tweeters, for all speakers.....I know, sounds funny, but that's what they'll always say.
Can you go Activ with that bi-amp combo??
Ken