John Brandt

    Most effective.. Hmmmm. That's a trick question!

    It depends on the frequency range of interest... let's talk about under 100 Hz:

    I normally trap corners as deeply as possible, but after about 16" deep, the lightweight, fluffy stuff (not compressed!) becomes reflective. Therefore, I will integrate wave guides wrapped in 2" of fiber. There should be space between them so that air flow (sound flow) past them is uninhibited. The wave guides should be massive. I use 3/4" MDF.

    THAT is the most effective corner trap. Next step up would be similar with a membrane next to the corner boundaries.