Wayne Parham Messages: 18793 Registered: January 2001
Illuminati (33rd Degree)
That's an excellent idea. Highly encouraged!
I think you would probably get deeper bass from a driver like the LAB12. But flanking subs are mostly for the upper midbass anyway, for providing baffle step correction, and for mitigating SBIR and higher-frequency room modes. It's a helper woofer, sort of making the loudspeaker system into a three-way with the woofer being detached. And for this purpose, I think the Delta12LF tuned as you've described will probably work pretty well.
Your three Pi loudspeaker looks wonderful, by the way. Kudos!