Amp choices

I have a Pass and know the Halo A series amps and there's no comparison. Not even close. I have a X250 not a .8. The older X250 is still a great amp and can be had for a lot less than the .8. I'm sure the .8 is better and that will be my next amp, but if you want to start for less the X250 will not disappoint; it'll be a big step over your 8008.

The Pass and Krell's are different from each. Some prefer one over the other so see if you can listen to them first. I listened to a couple of Krell's at home and at the local dealership and they don't do much for me. I preferred my previous ARC 100.2 over them as it was more musical to my ears.

If you pick up something used you can probably flip it and not lose much if you don't like it. Reno HiFi will let you demo which is nice; just have to cover the shipping if you decide not to keep. Not sure you'll find a Krell dealer to do that but maybe.

Thank you.  I hear good things about the .8 amps and the 250.8 seems to be the sweet spot.  You mentioned you know the A21 well.  Would you say it's sideways to the 8008? 

That Aragon is still a nice amp, some would say better than the Parasound.....those speakers are definitely worthy of something like a Pass.

The Aragon and Parasound are both nice amps, but they are different sounding from each other. I agree with others your SF are very nice speakers and I would look at a more refined amp than the Parasound if you're looking to replace what you have. Definitely a more sideway move than a Pass or some of the others mentioned. The Parasound is probably missing the authority of your Aragon, but the Parasound has a better balance. Both the strengths of these two amp will be there with the Pass but at another level. I remember the Aragon well and like the Paragon they both are really good, but they don't disappear; especially the Aragon. The Pass will disappear which is what a great amp should do. I really don't feel I'm hearing my amp but more of how nice my preamp is. 

Merrill Audio Veritas mono blocks will rock the 3's. These amps are refined,musical and will let the SF3's come alive in a way that is very involving and natural. The SF's need power to sound their best and the Merrill's will deliver in spades.