my 4-layer MDF baffle isn't enough to stop my doors from rattling //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif
for randomness, I just bought some of this stuff to try out in the car.
http://www.henry.com/fileadmin/pdf/datasheets/HE287SF_techdata.pdf
Add some mass to it or rebuild it using better materials.
Oh, I was mistaken on my "HDPE is
way more dense than MDF," sorry. In general though, I think plastics (HDPE,polycarbonate, polyethylene, whatever) are the way to go if you can find them. I have both resin and elastomeric-coated MDF and plastic in my "baffles", but also a shitload of deadener on the door surface as well - so it's hard to judge the actual effectiveness of the materials.
Some density figures to warm up to....
MDF = 0.6-0.8g/cm^3
HDPE = 0.960g/cm^3
Aluminum (6061) = 2.71 g/cm^3
Concrete = 2.4g/cm^3
Lead = 11.34 g/cm^3
Fiberglass/Resin 50/50 = 1.7-1.8g/cm^3
Granite = 2.75g/cm^3
Problem is material costs are way up nowadays, so it's getting harder and harder to source the good stuff on the cheap. In the end, you have to spend money somewhere if you're going to run anything above a 6.5" driver. Point is, don't waste in on foam. A proper baffle can mean +/- 3 dB of output (which we know is 2x the amplifier power, or 1/2 the amp power if you look at it that way.)
/spoon feeding. You're probably full now, eh? I kid. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif