The Lorelei's are rated for 150watts so 85 watts shouldn't be an issue. But as Klaus preaches, system synergy might be. You won't know til you listen. I can say that my Butler amps work darn good with my Lorelei's and being rated at 150wpc, I haven't had any clipping problems with them. I have had them connected to a 250wpc Butler amp that did infact overpower the drivers so I would imagine you're better with a little less than a little more than the rated 150 watts.

Cheers,
Robin