DBAs add complexity and would also likely take more time and effort to get right initially as a result. If it were me I would solve one problem at a time....resolve the problem at hand first with existing sub then consider adding DBA after that is resolved, but only if worth it for you.Actually in practice a DBA is easier to set up than a single sub, since you don't have to work so hard getting the bass right at the listening chair! When I installed my setup, I already had speakers that made deep bass (flat to 20Hz) so I only added two subs. I only placed them once. Only hooked them up once (IOW didn't play with phase). I used cheap speaker cable. I didn't mess with the amplifier crossover settings more than once. It worked perfectly the first time. By comparison I have a single sub in my bedroom, and moving that thing around so I finally got bass where I wanted it (and not all the bass is there, its a bit of a compromise) was a bit of a pain, plus the sub is sitting in an obvious space, but where it would be convenient doesn't work- no bass in that location.
Well its 45 amps per monoblock X 2 = 90 amps total.....nothing to sneeze at especially with a most efficient Class D design.Uh- can we do a bit of math here? If 45 Amps, giving the amplifier the benefit of the doubt, so driving a 1 ohm load. The power formula is Power = Isquared x R where
power is in watts
I is amps (in this case 45) and squared
R is the resistance of the speaker
This means that if the amp makes 45 amps it also is capable of 2025 watts. If we are talking 4 ohms, then the output power is 8,100 watts. Clearly this isn't happening. A speaker that only dips to 4 ohms isn't going to need that sort of current in any event. The OP simply has no worries in this regard. The fact that the amp is class D is irrelevant in this regard and will behave as an ideal voltage source driving this speaker.