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20[LOG N2/N1]where N is the number of subwoofers, or N2/N1 which is the ratio of new number vs old number. If you went from 6 woofers to 2 woofers this would be:
20[ LOG 2/6 ]or -9.5dB less than 6 woofers. The opposite works as well where going from 2 woofers to 6 woofers = +9.5dB. The easy rule of thumb approximation is +6/-6 dB any time you double or half the number of equally powered woofers, and +12/-12 dB if you quadruple or go to 1/4 the number of woofers.
10[ LOG W2/W1]with a corresponding approximation of +3/-3 dB any time you double or half the power in Watts, and +6/-6 dB if you quadruple or 1/4 the power in Watts.
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