Best Pass Labs Amp with B&W 800 Diamonds?

Mimskev: Passive biamping is no big deal, it's not hard. Active biamping with an external crossover, is a bit tricky. Either way, Pass Labs has you covered as they make active crossover units.

Mimskev hi, look at the phase (dashed) v Impedance (solid) at 60hz 4ohm, this is where the two meet, now this is not a 4ohm load, it could be as low as 1ohm and this is where the bass power/control is required. Also up high at 8khz.

http://www.stereophile.com/content/bampw-800-diamond-loudspeaker-measurements

An amp to drive these nasty loads with comfort ease and good amperage, should be able to almost double it's wattage from 8ohm to 4ohm to 2ohms eg: 100w 200w 400w

This sort of amp needs to have bi-polar output devices, not mosfet as I belive the Pass amps you mention are. Sure they will work and sound good but at these points 80hz and 8khz an amp with bi-polar not mosfets will sound better.

Cheers George

Can you post what are main diff between XA160.5 and X250.5. I own X250.5 and found fail to power B&W801d.

I owned 5 different Pass labs poweramps, and in the past I owned the 800 S from B&W. I would go for the 600.5 in your situation. You need a paired set of mono's. The extra current will give you a better result than the XA series. I owned 3 different XA.5 models as well. The Purist Audio Limited Edition is one of the best powercables for Pass. I tested many on Pass Labs for over 6 years of time. I do consulting in sound7vision and I work in this world for over 17 years of time.

Wouldn't the 1000.5 be the best?