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4,602 Posts
so Im just playin around still waiting for money. no sawdust, no pics, no vids here...
so I build a van with a few very large drivers walled off in a very large vented box. Say 40-60 cubic feet with a huge shared 14" round port. Responce in open air is obviousely different than in-house which is different than in-car. But see, here's the thing. I know a car flexes. I know it has leaks. I know the SPL guys break out layers upon layers of deadener, cans and cans of expanding foam, concrete... welders... steel tube and sheetmetal...MDF, fiberglass, resin.... it goes on and on. 2x4's..layers of 2x4's and MDF.
Lets say I get a van, gut it out, fill every single space I can with foam. No airleaks anywhere. Hit everything with a few layers of resin. It's not as good as it could be, but, it's good. What if I only build a wall... no enclosure behind it. Behind it is sealed. It's pretty solid. I know you hate it. But take a sec and get over it. So it is an "IB" wall even though it is NOT an "IB" wall. I have a port in it anyway...
so I now have 50-80 cubic feet behind the wall, it is pretty lossless...not perfect. Well dude... the front 1/4 of the van is only 1/4 the airspace. The port goes between both. The drivers between both. It's more like a bandpass box with NO ports to the outside... just a single port connecting the 2 chambers together. Which volume of air is being "tuned"?
so I build a van with a few very large drivers walled off in a very large vented box. Say 40-60 cubic feet with a huge shared 14" round port. Responce in open air is obviousely different than in-house which is different than in-car. But see, here's the thing. I know a car flexes. I know it has leaks. I know the SPL guys break out layers upon layers of deadener, cans and cans of expanding foam, concrete... welders... steel tube and sheetmetal...MDF, fiberglass, resin.... it goes on and on. 2x4's..layers of 2x4's and MDF.
Lets say I get a van, gut it out, fill every single space I can with foam. No airleaks anywhere. Hit everything with a few layers of resin. It's not as good as it could be, but, it's good. What if I only build a wall... no enclosure behind it. Behind it is sealed. It's pretty solid. I know you hate it. But take a sec and get over it. So it is an "IB" wall even though it is NOT an "IB" wall. I have a port in it anyway...
so I now have 50-80 cubic feet behind the wall, it is pretty lossless...not perfect. Well dude... the front 1/4 of the van is only 1/4 the airspace. The port goes between both. The drivers between both. It's more like a bandpass box with NO ports to the outside... just a single port connecting the 2 chambers together. Which volume of air is being "tuned"?
