Two amps at same volume each with a 12" speaker side by side

[pjd3]

Hello,

Curious a bit here,

If (and when) there are two identical amps (20 watts each into their own 12" speaker side by side in a combo), what be the perceived volume when both sides are equal with same signal? (6 dB increase twice the watts?

Thanks. Somehow I recall perhaps a 6 dB increase.

Best,
PJD3

[pdf64]

Assuming both speakers are put out coherent signals (identical amplitude and phase), yes, 6dB.
3dB from doubling the speakers (mutual coupling), 3dB from doubling the power.

[pjd3]

Thanks pdf,
By what you say, it sounds like both an electrical and an acoustical component coming into plays and not just one or the other.
Best,
Phil