Thanks for the input guys!
I'm still trying to understand though WHY a sheet of plastic, whether 3 mil or even 1 mil thick (which is darned near like Saran Wrap) would have a negative impact, or ANY impact, on sound waves.
I could understand that if your final exposed layer was a 3 mil sheet of plastic that it may reflect a certain extent of upper frequencies as opposed to absorbing, but if the plastic is covered with soft fabric, or even better, a pleated curtain of thick fabric hanging a few inches out in front of the plastic, I'd think that whatever upper freqs that would normally be reflected by the plastic would be absorbed by the fabric / curtain BEFORE they even hit the plastic... and whatever freqs would actually reach the plastic at that point would go right through the plastic like it wasn't even there.
Where is the error in my reasoning? I just want to fully understand this.
As for dust, dust mites and such, thanks for the advise, I am well aware of those things, I keep everything so incredibly clean at all times it's ridiculous. I have a custom air ventilation system in the works that will provide fresh HEPA filtered air into the room, putting positive air pressure on the room... also an air conditioner / dehumidifier, remote vacuum system, etc... the air in the room will be kept at a near "perfect" state at all times. With this level of insanity in mind, you can see why I'm concerned about making sure not to have ANY potential for fiberglass fibers floating around in the room.
Again, I'm just trying to understand why, for argument's sake, a mere 1 mil sheet of plastic, "sandwiched" BETWEEN a thick fabric curtain (exposed side) and say 4 inches of mineral wool would / could have any effect on sound. And if it definitely does, exactly what effect would that be? How will that 1 mil of sandwiched plastic sheeting harm the sonic response of the trap?
As always, much thanks
