Devialet for Wilson Audio Sasha 2 Speakers

You don’t know what you’re talking about, pure and simple.

Sorry it’s the other way around sunshine.
Yes the F5 is a good little amp, but it has limitations with many of today's speakers. 
You clearly have an agenda looking at the amount of F5 posts you have. 

Cheers George

Go look up some stuff before you come here and make flat false claims about gear you have no actual knowledge of please.

I just hope the OP doesn't take your advise for a F5 as he will be disappointed with the outcome. As you have no idea for an amp with these speakers he has. And I'm also tired of you.

Cheers George 

I never once mentioned the F5, it’s obvious that you have a thing for them, yes it is a amp designed by Nelson for diy’er to build to push current, but in this case it has very low gain and only 25w/8ohm, 40/2ohm not enough for these and speakers for the owner to get big levels from, and Nelson has never said it can drive 2ohms with a -45 degree -phase angle in the bass. 
The speakers it keeps company with are at the opposite end of the Sasha/Alexia scale.
http://www.6moons.com/audioreviews/firstwatt7/f5.html

All my quotes relate to Mosfets V BJT (bi-polar) in general normal linear push/pull class-a/b linear amps.

Cheers George

Device for device a BJT will out current a Mosfet.
Given powersupply conditions are right for both. Sure 10 complimentary pairs of Mosfets, will do a certain "current job".
But 10 complimentry pairs of BJT’s will do a far better "current job".
That is why Krell and Agostino and others use BJT’s, as they want to be able to almost double the wattage for each halving of impedance load all the way down to 2 or even 1ohm, to drive things like Sasha's and Alexia's

Cheers George

Even so this sort of impedance and -phase angle load that the Sasha presents in the bass needs a lot of current to drive, and BJT’s do that better than Mosfets can.
https://www.stereophile.com/images/archivesart/710Wilfig1.jpg

Cheers George

As far as I know Nelson doesn't design anything with BJT outputs.

Suggest you look at nearly all the bigger Thresholds amongst others he designed.

Cheers George 

Devialet for Wilson Audio Sasha 2 Speakers
jmvs

+1 for the Pass Labs INT-60 "if" it uses bi-polar (bjt) output devices.

As those Sasha speakers need current around 100hz @ 2ohms in conjunction with -40 degrees phase angle and bi-polars are best at doing this, not mosfets, tube or classD
http://www.stereophile.com/images/archivesart/710Wilfig1.jpg

Cheers George