Those subs don't have any filtering for the mains, so you would still need some way of keeping frequencies below 100-120Hz out of the mains, and with a decent rolloff like 24db/octave. For that, a two way active crossover will be needed, or at least a high pass filter.So if I keep my ATCs, would a pair of these do the trick? Would I effectively be building something like the Revel F208s? I can then place the ATCs on top of these subs.
S