Will I benefit from a subwoofer with 20Hz speakers?

@atmasphere

Happy for you. :) Bass is great when under control. Maybe I just find me another DD15+ and hang it on the wall. Nice and easy.

@atmaspher Yuo tell us acoustics is simple. Put two small swarm subs in the room and your ears won’t hear any peaks or dips. Well, to me it isn’t.

My point is you swarm guys always make it sound so easy. It’s not. Theory is fine. You might very well be able to break up a significant dip or “null”. But peaks and dips will still be there in a normal room and will need eq to get fully satisfactory bass. But I agree on driving high quality speakers all the way down and adding sub or subs to that.

Sorry being so stubborn, but "eliminate" - no, "reduce" - yes. If you start from +/- 15 db shifts or more in the bass region, which most of us do (look at the measurement the op did), then I’d say there is no way a swarm setup will flatten that out so you won’t hear any peaks/dips . If using several subs can reduce that to 50% or +/- 8db that’s great. And above all remove any "nulls" (infinite dips) while they can not be corrected with eq (dsp).

It’s good you’re using Dirac in that room otherwise your system would be unlistenable because of the bass amplitude.

But I’m not sure there is a need for using Dirac above 500hz.

And, don’t trust the Dirac curve too much. If you measure your system as @djones says you will almost certainly get something else. And what you measure right now may also be distortion to a great extent. The freq. curve is just the beginning.

I use some Dirac for the bass yes, but then apply Roon eq according to my hearing.

I’m not of the opinion that Dirac and similar dsp tools gives a too lean bass. Quite the opposite. Don’t trust the smooth calibration curve.

I also use a phenomenal sub to my true 20hz speakers. For the possibility to show off when someone wants more bass :-) but also for HT use and for the fact that some recordings really need a push down low.

More subs will also give you a better distributed bass in your room, some says. I’m not so sure that will help a lot. You’ll still have peaks and dips.