@almarg
Yes, loss will be 6.54dB, but from rated sensitivity of one speaker it will be only 3.54dB. For 2m listening distance, that they likely assumed as an average, there will be no error. Sound level at listening position will be the same as rated sensitivity.
In case on hand each speaker sensitivity is 86dB. Two of them playing at the same time add +3dB, room adds +3dB and distance of 2m causes 6dB drop resulting in 86dB sound level at listening position when 2.83V is applied to both speakers. Am I missing something?
Yes, loss will be 6.54dB, but from rated sensitivity of one speaker it will be only 3.54dB. For 2m listening distance, that they likely assumed as an average, there will be no error. Sound level at listening position will be the same as rated sensitivity.
In case on hand each speaker sensitivity is 86dB. Two of them playing at the same time add +3dB, room adds +3dB and distance of 2m causes 6dB drop resulting in 86dB sound level at listening position when 2.83V is applied to both speakers. Am I missing something?