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.

The amps I heard were the new Bernings!Wonderful.

have u heard hyepx DIY amps?do u think it can be good match

I have heard hypex amps made out of the mid-powered modules (not driving the extrema). They were OK. I've never heard any hypex driving Extrema.

You need a very stable amplifier with a lot of output (see Twilo above). I used YBA and Symphonic Line -- which are expensive so, not recommended.

Any hi-powered amp should do in the beginning... what's the output of those Behringers?

Thabx Twilo:

I heard that a pair Meridian 557 (bridged) can be a good match whith Extrema.But I want something ligheter(in weight and money)
can u please explain why u think Class D amp isn't a good chooice for the extrema?
U wrote they small but there are very powerful moudle out there ,for exmaple Gregm mentioned Hypex,the 400AD module is very powerful - 400 RMS into 4ohm.
About the PRE - Do u think tube pre amp will be good?
Any recommendations?not expenssive one cause most of my budget goes for the Extrema.

Thanx U all

Actually if you want a cheap amp under a 1000 used that can definitely power the Extremas.
The Citation 7.1 4-ch amplifier is a great choice.
The key is to bridge the amp to 2 channels.
When you bridge the amp to 2 channels its 450 watts.
This is one high current amp that sounds sweet.