SF Extrema,Few q

Here's what I can tell you about the Extremas.
The Extremas having no capacitors in their crossover and require some hefty amplification.
I wouldn't use any Tube amps or Class D amps.
Alot of the Class D amps are very small.
The Extremas use a unique Skanning midrange.
Skanning makes only Polyprolene midbases and woofers.
The Skanning 7 1/2 midbase woofer on the Extremas is a Polypropelene driver with Carbon Fiber.
The Carbon Fiber part of the midbase driver is made by Sonus Faber, not Skanning.
The Carbon Fiber made by Sonus Faber for the Extremas uses the best material.
This Carbon Fiber when combined with the Skanning Polyprolene driver has a sound that has to be heard to be believed.
The speakers sound so rich and transparent with soundstaging that is so holographic.
The bass is fast and tight.
A great amp on the Extremas is the Meridian 557 amps bridged.
Used these amps probably cost like 1000 each.
This is what my friend is using.
The 557 amps bridged are like 800 watts.
One 557 amp couldn't power the Extremas.
My friend and I tried it.
But when you use 2 Meridian 557 amps bridged.
Holy Moly did these speakers sound incredible.
It was night and day when you bridge them compared to using 1 557 amp.
1 557 amp just wasn't powerful enough.
I also agree about the Audio Research D400 amp.

One thing I forgot to mention, their were 2 versions of the Meridian 557 amp. Version 1 and Version 2.
From what I remember, you can only bridge them if their the same versions.
So if you have version 1 and version 2, you cant bridge them.