With more than one subwoofer, proper phasing is important. I mean, there is a potential for the two subs to cancel each other out if the phasing is not right. (Apologies for being pedantic if you already know all this.)
For example, one sub cone could be moving forward during a vibration while the other is moving backward, and the result could be that relatively little bass is actually put into the room.
The cancellation is a function of the input music signals (if they are not identical, like a right versus a left), distance between the subs, and the phase settings on the subs. Dynaudio subs have phase adjustment controls, so after you place the subs where you want, be sure to adjust their phases to your liking.
For example, one sub cone could be moving forward during a vibration while the other is moving backward, and the result could be that relatively little bass is actually put into the room.
The cancellation is a function of the input music signals (if they are not identical, like a right versus a left), distance between the subs, and the phase settings on the subs. Dynaudio subs have phase adjustment controls, so after you place the subs where you want, be sure to adjust their phases to your liking.