What you may need for your problem may simply be a pair of Cathedral Sound Panels. They are tiny, a snap to install, inexpensive and very effective on frequencies south of 200 Hz, even down close to 20 Hz.
But beware, they operate on a completely different principle of physics than the usual bass traps, manufactured or DIY and therefore scare off most audiophiles. They’re just a shallow, cloth-covered box with layers of ’pegboard’ inside with many air-holes drilled into them and offset at a particular distance from each other in order to set up a sort of sonic ’maze’ for the sound pressure to travel down into before becoming ’diffused’ and their energy is absorbed. The science is not new. It’s actually just a reasoned application of Bernoulli’s principle (high school physics) in which air (a gas) speeds up when flowing through a constriction (like water speeding up through a spray nozzle in a garden hose). The panels end up being a bit like a Helmholtz radiator for your room...they trick your woofers into thinking the room is larger than it is. But, with such an efficient use of surface area, the device need not be large, even with bass frequencies because what we’re dealing with here is wave pressure, not wavelength...this is where, I think, the whole bass trap idea/industry, comparatively at least, and certainly from any price/performance ratio, has gotten it all wrong. Unless your particular room is some kind of unholy challenge, then I’d say this is your best bet.
This solution is:
effective
fast
simple
cheap
a breeze to transport
good resale value
what else is there??
