Soundproofing Materials

[Why So Cereal? 5,000+ posts]

The thing about this is what kind of testing you are doing.. mic placement etc..
how are you going to measure sound deadening? keeping sound out or in? if you could explain this better it may help..

sound deadening a room will kill resonance/decibel levels but you will have better sound reproduction..

if you are simulating a room are you simulating vaulted ceilings flat ceilings? the ratio of cone area : Room space since this is a small box is going to be a big deal and will probably make the testing results minuscule.. limited sound proofing to cone area.. if you get what I am saying.. also different materials will do better or worse for different frequencies so if you get a cheapo decibel meter that does not show frequencies across the board you are not looking at this correctly..

It really appears like you are trying to lower decibels in a room with the speakers in it with different materials which is not really a good thing or even something to look at.. People sound deaden rooms to keep resonance down(unwanted spikes in certain frequencies aswell), keep unwanted noise out, and keep the sound from leaving the room

good thinking. I guess to put it simply I am just gonna test its ability to keep unwanted noise out. Flat ceilings as well. I was gonna just play like a 1khz tone with no deadener; record db's then see the difference with each different material. But now i see that maybe I need to try different frequencies as well. or keep the material constant and change the frequencies played.