Rega Elicit R w/PSB speakers

The Acoustic Arts is a nice amp, but a weak built-in phono stage is often the case.

Powering my PSB Sync Ones with my solid state Ayre integrated - love it.

How many watts into 4 ohms is your Ayre?
What do you think of Bryston seperates
BP17 pre & 2.5 amp

Fishing716,
It really isn't a matter of how many watts an amp is at 4 ohms. 50 watts is capable of decent volume levels with synchrony one's... (88 to 90db sens)I'd probably want 100 minimum.
The problem is what happens to an amp trying to drive a 4 ohm load... The better an amps power supply is the closer that amp comes to doubling its power from 8 ohms to 4 ohms, that is the reason for the wattage recommendations. A good power supply sounds better and your amp won't crap on itself trying to drive your PSB's.

Sorry Fishing716,
I really should have mentioned. If you are a rocker, or listen at relatively high volumes for long runs of time, your Rega might have a problem, but if you listen at reasonable levels for an hour or two on occasion and aren't driving the bass hard. Your Rega should work fine... I don't want to mis lead you though, other amps that have proper power supplies may or may not sound better than your Rega, depends on the amp and your listening habits.