Both books are excellent.
Anyway, if you can't move the speakers or listening seat, and if your main concern is with one person listening in the sweet spot, I suggest you go with parametric EQ. It will solve the problem at your preferred listening location and has a higher WAF than external traps. (You can build bass traps into walls, but that of course requires major surgery.)
Anyway, if you can't move the speakers or listening seat, and if your main concern is with one person listening in the sweet spot, I suggest you go with parametric EQ. It will solve the problem at your preferred listening location and has a higher WAF than external traps. (You can build bass traps into walls, but that of course requires major surgery.)