What is a "tuned chamber?" I've never heard of this room treatment.
Instead of dipole, use both front and rear baffles and both are enclosed within the cabinet design. RM50 VMPS. There are a few more now. The old QLS Infinity. NOT the RS OB design. RS1 & Bs and the 2 and 2Bs or the IRS series.
A boxes (or cabinet) with TWO active baffles, front and rear.
Tune the room?
Read my Handle.. Helmholtz. The only way to properly tune a room..
There is a guy that post here that uses the term "Embedding" he has 3 major areas. HE is very close on his design.. A little muddled in his room, BUT he did it by reading and experimenting. A brave endeavor by my standards. :-)
Helmholtz, I use adjustable slot resonators for above 120hz and adjustable tube traps for 120hz and below. All designed by SB/SAT. Oldhvymec's design, it works VERY well. I've used them for over 10 years. He's been at it for over 45 years.
Curtains, Resonators and Tube traps. OHM bass system is the bomb. Ask him. He always helped me. I have one of his air ride decoupling systems from way back.