Sorry about bringin this up after a year or more.
Question regarding Q and the mass of a passive radiator.
I have two sets of very large floorstanding full-range speakers, VMPS Super Tower and Super Tower III, designed by the late Brian Cheney.
Each speaker uses a 15" downward-firing passive radiator. Morite putty is attached to the PR, and the end user is supposed to add or remove it to achieve the desired bass response.
I desire a low Q, tighter, flatter response. Generally speaking, would this mean more putty to increase mass or less putty to reduce mass? The instructions discuss what to listen for, but I'm interested in the more theoretical explanation.