yes. double cone area, double

power, add 3 db. so a second 10 with a second 350 rms would yield a total of 6 dB on the meter..... max

I struggled with this for a long, long time. what it comes down to is that the meter is not a measure of air "pressure" but rather accoustic "energy". Or is it the other way around? Honestly, it doesnt matter.

the point of the matter is that the meter will read 6 dB (max) higher when you double your displacement. which is exactly what you are doing by adding both a subwoofer AND doubling power.

now, the funny thing to keep in mind is that because of this, while the relationship between excursion and power requirements is still linear, its not a 1 to 1 relationship! Thus, to double the excursion (remember double excursion is double the air motion and therefore a 6 dB gain on the meter!) keeping only one subwoofer would require FOUR times the power! Thus we see that the rule of double power for a 3 dB (max!) gain holds true! assuming the cone of the woofer can actually travel that far!

last thing to think about is, why make the distinction between energy and pressure? well, doubling the excursion IS just a 3 dB gain! in pressure

(or is it energy? Honestly, it doesnt matter). Thus, we need double the power AND double the cone area to get our 3 dB gain! but the meter will read 6 dB (max!) up.

get it?

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