I am going to suggest something different than the distributed array given the size of your room. Tim (Noble 100) will undoubtedly have a meltdown, as he is a member of the distributed array church and no others are allowed to suggest there is any other way to add subwoofers to a system. With that disclaimer, here are my thoughts:
1) Your room has a good distribution of nodes, with your major bass nodes at 40 & 47 hz, followed by 70 and 80hz. In the case of your 40& 47 hz, they are located immediately against the walls, an unlikely seating position.
2) One failure in Tim’s analysis of rooms is that while a distributed bass array is better at providing more uniform bass throughout a room, for a single seating position, you can virtually always get as good of response with two subwoofers. He seemingly ignores that it is the literature he relies on for the basis of his belief of a distributed array that also studied a single listening position.
3) Run an active crossover to relieve those 5" drivers in your main speaker from bass duties. By reproducing deeper bass, especially as the volume level increases, the driver will experience increased distortion. Marchand Acoustics builds some excellent active crossovers.
4) I would use 2 Rythmik F12 subwoofers (or even due to your room size two F8 Rythmiks) which have a built in single band parametric EQ’s that can address if you still have any issue with you 40&47 hz nodes after careful setup.
5) Setup, Setup, Setup- Spend time getting the subs setup. You will need to place each carefully and phase each to integrate with your main speakers. There are many guides on how to do this. I personally suggest using Room EQ (free) with a calibrated microphone ($60-80) as you can run sweeps and see what is going on in seconds and the effect of any adjustment. It makes placement and phasing much faster.
All in this puts you at $2,500 for excellent sounding subs that will blend in perfectly with your mains.
1) Your room has a good distribution of nodes, with your major bass nodes at 40 & 47 hz, followed by 70 and 80hz. In the case of your 40& 47 hz, they are located immediately against the walls, an unlikely seating position.
2) One failure in Tim’s analysis of rooms is that while a distributed bass array is better at providing more uniform bass throughout a room, for a single seating position, you can virtually always get as good of response with two subwoofers. He seemingly ignores that it is the literature he relies on for the basis of his belief of a distributed array that also studied a single listening position.
3) Run an active crossover to relieve those 5" drivers in your main speaker from bass duties. By reproducing deeper bass, especially as the volume level increases, the driver will experience increased distortion. Marchand Acoustics builds some excellent active crossovers.
4) I would use 2 Rythmik F12 subwoofers (or even due to your room size two F8 Rythmiks) which have a built in single band parametric EQ’s that can address if you still have any issue with you 40&47 hz nodes after careful setup.
5) Setup, Setup, Setup- Spend time getting the subs setup. You will need to place each carefully and phase each to integrate with your main speakers. There are many guides on how to do this. I personally suggest using Room EQ (free) with a calibrated microphone ($60-80) as you can run sweeps and see what is going on in seconds and the effect of any adjustment. It makes placement and phasing much faster.
All in this puts you at $2,500 for excellent sounding subs that will blend in perfectly with your mains.