85dB / 4ohm is likely rated at 2.83V equivalent to 2W
85dB + 13dB = 98dB at 40W
98dB + 3dB(second speaker) + 3dB(room reflections) = 104dB
104dB - 12dB(4m distance) = 92dB
92dB should be plenty loud, IMO.
Luxman L-550ax
Hi,
I have just bought a Luxman L-550ax. I bought it for the reason of eventually relocating to a smaller place and need an all in one. Due to that relocation, I will eventually need to get bookshelf speakers. I've narrowed it down to the Ascilabs C6B. They are 85db at 4 ohm. Will the 550ax's 40w class A be able to drive them in no larger of a room than 15' x 20' ?
Thanks for the help