For sure dealing with the rear wave of a dipole speaker is important, and there are different strategies to do so depending mostly on preference.
One is to use broadband absorption, as thick as possible. The bass trapping on the front wall always helps, but fully absorbing the mids/highs on the rear wave sort of defeats the purpose & sonic characteristics of dipole speakers so it's nto the most popular option, even though some prefer it.
You can also use diffusion, which is a much more natural sound through the mids and preserves some of the rear wave energy in the room. However, unless your diffusors are several feet thick they are limited in bandwidth, ie, diffusors are more of a midrange thing, commonly operating from 500Hz-1kHz ish up to maybe 4 or 5k for most devices small enough to ship.
As a result my preferred method is to use hybrid devices that give some diffusion and also bass trapping. Thick binary diffusors (like our
Alpha panels) are a great and very flexible option that I love in this role. I also like poly diffusors (like our
Evolution Polyfusors) that give both poly diffusion and some bass trapping.
Feel free to reach out to us directly for more specific guidance.