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
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