restorer-john
Grand Contributor
Huh?
4ohm requires 2x the wattage [2.83^2 / 8 = 1W ; 2.83^2 / 4 = 2W] and since 54 = 2*27, an 85dB @2.83Vrms sensitive 8ohm speaker and an 85dB @2.83Vrms sensitive 4ohm speaker will get to identical loudness.
Except 4 ohm speakers are not sensitivity rated with 2.83V, they are rated at 2V...
Speakers are rated xxdBSPL/W- 8ohm speakers use 2.83V, 4 ohms use 2V.