Naim Nait 5Si and Focal 807W Speakers

Sure they are.
The Focals are very efficient being an 8 Ohm speaker with a sensitivity of 92 db. Just about any amp will drive them.
The better question may be if the Focals are a good sonic match for your ears?
If you heard them and like them, then go for it. The Naim will handle them with ease and never break a sweat.

I had the Naim. It won't have any problem driving the Focals, but its not a good sounding amp. It was probably the most over rated piece I ever bought. If you have a pair of very dull and forgiving speakers, the Naim sounds OK. On my B&W LM1's I use for my PC, it sounded pretty good. But those speakers have a soft tweeter and are very forgiving. When I put it on a better, more revealing speaker, it just fell apart sonically. The best way I can describe it is that its not a clean sounding component. It won't even come close to doing the Focals justice. I would pick a different amp.

Zd542
Yap, you was right. On Tuesday I packed the Focals and
went to the Store. The Focals sounded terribly with the Naim. The dealer suggested Arcam A19 but he don't carry the
Arcam's gear. Any opinion on the Arcam.