You get 91dB @ 1m from 2W. It will drop by 6dB at double distance resulting in 79dB @ 4m. Presence of the second speaker and room reflections add 3dB each resulting in 85dB. 20W of power will produce sufficient 95dB loudness (85dB+10dB).
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.