Kukuraai Posted March 21, 2017 Report Share Posted March 21, 2017 Hey all, I drew up a pretty simple design for a vented enclosure for a 12" Polk subwoofer in my car, and before building it I wanted to run it through people with experience to see if anything immediately stands out as a problem. This is my first build so bear with me So the outside dimensions are 28" x 15" x 14", using .75" MDF. The net volume is 1.54 cu. ft., and the port is a 12.5" x 2" slot, tuned to 27.4Hz at 54.75" long (I'm probably going to extend the port length to get it to an even 27Hz, but that's gonna change the net volume slightly so I haven't bothered yet). The sub is a Polk Audio MM1240DVC, and the suggested ported box volume is 1.58 cu. ft.. I put in the values to Speaker Box for android and came up with a few graphs. Ignore the green line, the red is the ported box I designed and the blue is a 0.8 cu. ft. sealed enclosure, which is what I used to have the sub in. I'm not really familiar with phase response, does this all look good? My goal was to get a smoother (less punchy), deeper sound from my sub. The sealed enclosure I have sounds tight and clean, but I wasn't satisfied with how early it rolled off. I wanted to try and create a vented enclosure that was much deeper but still relatively responsive, and clean sound is just as important. Another thought was to keep the time delay as small / low (out of music frequencies) as possible. My personal goal was 20ms at 30Hz or less / lower, which is right where I ended up. But I've never had much experience actually listening to delay, will that even be noticeable? Only a few songs I have actually hit 30Hz, and at that it's pretty much just a sine wave in hip-hop so I wouldn't imagine so. And, any fast beat (rapid kick drum) I would think is like 40-60hz, which only has 11-4ms delay. But again, is that noticeable? I guess the main thing I'm looking for is if there's anything with the design that'll give me poor sound quality Also here's a rough sketch of the design itself, and a CAD half-drawing (also first time using Autodesk lmao). On the final design I planned on putting angles in the corners of the vent to allow the air to travel more smoothly. http://imgur.com/yX1UZRy Link to comment Share on other sites More sharing options...
ckeeler11 Posted March 22, 2017 Report Share Posted March 22, 2017 What model sub? How much power? what is excursion like? Link to comment Share on other sites More sharing options...
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