Join Date: May 2013
Location: Ontario, Canada
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I'm a bit confused by the wording of your question... If you add a driver (doubling displacement), you get a 3 dB increase. If you double the power, you get a 3 dB increase.
So say you have 1 sub, 1000 watts, 100 dB.
2 subs, 1000 watts is 103 dB,
2 subs, 2000 watts is 106 dB,
4 subs, 4000 watts is 109 dB,
8 subs, 8000 watts is 112 dB, etc.
if you're talking about the - 3dB (f3) point, if you add another driver and don't change the box size, then it basically is halving the volume of the box, which will make it have a worse -3dB (f3)point.