Biamping with Linn LK85 and LK140 - any problem?

I have scavenged around and will shortly have a Linn LK85 and an LK140. I plan to biamp passively using the higher powered amp for treble (as is generally advised). Speakers are Tukans, pre is a Kairn. I can't afford to upgrade the 85 to a 140, but am thinking of going active. Is there any problem using differently powered amps, or anything I should be aware of?

Also, has anyone listened to the LK140? I'd very much appreciate any feedback.

Thanks.