Jax,
> Do you have any test information that would compare the decoupling properties of soffit traps to 'standard' sand or shot-filled speaker stands? <
No, and I'm not even sure how to officially test that. Aside from knowing that the lightweight material SoffitTraps are made from does not transmit vibration very well, all we did was put some speakers on them and verify that indeed no vibration travelled through the trap length.
> Can soffit traps be filled with sand-filled thick plastic bags <
No, but that's not really needed since they already decouple very well.
> Get a couple of mondotraps ready for me! I'll be ordering again soon. <
Thanks. They're right here ready to go.
--Ethan