First Watt with KEF LS50s

The F6 should easily drive it and sound wonderful

CRossing over at 80hz still leaves a fair amount of bass up to the low power amp and inefficient speakers. I’d predict sound with less impact or thinner than might be possible otherwise. If you check the audio frequency chart you’ll see upper bass comes into play quite significantly with most musical instruments. You could still well get into clipping sooner rather than later meaning distortion and/or rolled off dynamics at higher volumes. A smaller room would be best suited.

Bottom line is it may be "suitable" but less likely to be optimal.

Whereas two powered subs, ls50s and a high power and current amp would probably perform optimally in a larger room. Class D amps would be a great option to consider.

With no subs. ls 50s are better suited to smaller to modest sized rooms.

mapman, the Reno folks who sell First Watt concur that it's not a suitable pairing.  (I think I got carried away by how well the pair of 20-watt Cary CAD 573 SE tube monoblocks sound with the LS50s.) I sold the Parasound A 21 last night and will use a Proceed Amp 2s until I decide which way to go, i.e., a Halo Integrated or something else.  Which Class D amp would you suggest?

db

Budget?

Also please remind if you tried the HAlo amp with this setup and if so what was the issue there? I would think that to be a very suitable amp in your case.

Though I am less familiar with it the Proceed would appear to be quite suitable on paper as well. I’d be interested to hear how that works out.

If not satisfied with either of these, then I think Class D is a very good alternative to try.

If you mean a Halo Integrated amp, the answer is no.  I've used both an A 21 and A23 to drive the LS50s, and much prefer the A 21, but it's too large for the cabinet I want to use so I sold it last night.  Richard Schram tells me the sound with Halo Integrated should be closer to that with of an A 21 than A 23, so that's a strong recommendation.

This is a secondary setup that's in use most of the day, so a low energy Class D amp could be attractive.  My main setup uses three JC 1 monoblocks for LCR and two A 23s for surrounds.  I have three Proceed Amp 2s sitting on a shelf that as I recall, are fine amps, but an integrated or Class D is an attractive idea.