i made a box at home this week for an 18 but the 18 hasnt arrived due to backorder problems at my warehouse.
so to test out the sound of the box i installed a radio shack sub, 15" 100 watts rms 92spl. its extremely boomy , its got a 4 inch port that is 4 inches long. the box is 22.5 x 22.5 x 46.5 inside dimensions and 2ft x 2ft x 4ft outside.
i dont know how low this thign goes i dont have any instrument to measure HZ but i garuntee its gonna be below 30 i can feel more bass then i can hear.. the bass is felt much farther away then it is closer to the speaker .. it seems to carry out for like a hundred feet or more cuz i can hear it outside even tho its down stairs... strange but somehow i think the box works fine. maybe the port is too short maybe its just fine ... it seems fine for the 15 inch sub i got in there but the sub over exerts itself from time to time and the Voice coil hits the back plate and maybe thats from the port being too short or somethin i dunno but it still sounds better then a pair of 15's in a smaller box comparably. its as big as a refridgerator hence the nickname i gave it.. the Fridge..
unfortunately i cant move it so it still sits where it was built in my basement , i forgot how much MDF weighs ..
i have to build a second one as with everything in stereo u have to have 2 speakers .. cuz i have a crown 2 channel amp. i bet its gonna sound even better with the pyramid 18" 1000 rms subs in em. just gotta get some casters mounted to roll it around where i need to. i am wondering would a SEALED enclosure perform as well if i made it the same size? or would i be wasting my time?
large ported boxes are my specialty but maybe a big sealed one mite work good for tight bass.. any ideas?