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how about using fiberglass to dampen & increase rigitity?

Posted by thump on February 3, 2017 at 03:54:18:
mass loading would seem to work a lot better when you're able to bond your damping material to the front, back & sides where passive weighting doesn't work as much as increase the likelihood of buzzing.

i definitely believe in mass loading, especially when it's part of a design, but after the fact, especially with speakers, it can be tricky. i "mass loaded" a cheesy 12" sub cabinet i bought that was SUPPOSED to be 3/4" thick MDF, but only was on the front baffle with everything else lousy 1/2" or 5/8"

i spent a few days lining the interior with another 3/4" of MDF, one small piece that could fit through the woofer cutout and be weighted down at a time. the final cabinet was MUCH better damped and "knock test-proof", but was also extremely heavy and lost a lot of internal volume too once lined with 2" & 3" acou$tic foam tiles

after looking at another thread where someone mass loaded speakers by weighting their tops, i thought, yeah, but it doesn't do a lot to dampen resonances in the front, back & sides.

another issues with external mass loading would be if your dampening material is flush with your front baffle, it would ruin imaging through diffraction.

it would seem to me that a literally more seamless way to "mass load" (more increase rigidity really) would be to line the interior of a cabinet with fiberglass. besides adding a lot of rigidity without adding "too much mass" (as in in case you have to move stuff) it would also improve dampening by bonding a material with totally different resonant characteristics to your cabinet.

you could also further enhance rigidity by adding internal bracing ribs and if you also wanted to include mass loading, bond sheets of lead with your fiberglass.

yes, this is an apples and oranges solution, but is also one i haven't seen anyone toss out yet.