in most cases a high quality 15-50 watt Class A amplifier will be enough to drive your speakers, it wil definitely be more efficient. Here's a snippet of power delivery and relationship: https://sw1xad.co.uk/technology_post/power-delivery-relationship-between-speakers-and-power-amplifiers/
Your PS Audio has power headroom, but you rarely use even 50W unless you're cranking it very loud or have a huge room.
How much power needed to drive 91db speakers?
Sonus Farber lists the sensitivity of my speakers at 91 db SPL@ 1 meter @4 ohms. They also say I should use 50-450 watts of power. My PS Audio amps pump out 500 watts @4ohms, so the max isn’t a problem, but if I switched to something 15-50 class A watts, would that be more than enough power?
Thanks in advance.