Originally Posted by Bill Fitzmaurice Doubling the sub count will always result is a 6dB increase in total output capacity. When mutually coupled (that's the correct engineering term) less than 1/4 wavelength apart their outputs are fully constructively combined.
When separated by 1/4 wavelength or more their outputs are both constructively and destructively combined, depending on frequency and the separation distance, and the effect of room modes. The ideal process by which they smooth room response is that their outputs constructively combine to fill in null frequencies, and destructively combine to reduce peaked frequencies. Another factor is that 1/4 wavelength distance. The more subs you have the less the maximum distance between any two of them, and the higher the frequency to which they mutually couple. That's why some of the best results come from having a wall of subs across the front of the room, where that 1/4 wavelength distance in the pass band between any two of the subs is never realized. But as that requires less than 3.5 foot spacing between subs with an 80Hz crossover it can be a very pricey option.
Is the bold comment based on the assumption of running two active subs, effectively doubling the vd and power?
Given the context and forum location of this thread, I ascertain we are referring to coupling two RW-12D subs. In that case we have double power and double displacement.
Or does your comment imply that coupling subs while using the same power could net a theoretical gain of 6db from an acoustical standpoint alone?
I fully understand that doubling passive drivers would alter the impedance load of an amp/amp channel, thus making it somewhat impractical to expect the same power as supplied to a single sub...
I just want to make sure we're all on the same page because I think it's pretty clear to us all that the OP will get a taste of bass from the RW-12D and come clawing back for more with 10-20x the budget...
At least he will if he sticks around AVS...