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Old 01-13-2016, 04:18 PM
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Default First 4th order how'd I do?

Never done a 4th order and since I have a plethora of 12s sitting around I figured 40 bucks worth of wood might be worth the investment. I'm using 2 Pioneer TS-W305C single 4 ohm woofers wired to 2 ohms getting about 300-350 watts apiece. The woofers are on the same baffle and offset a little to fit.

32" x 25.5 x 16 Outside dimensions

The sealed portion is 11" x 24 x 14.5" internal dimensions. That should give me about .8 cubes per woofer after displacements (maybe .7 each). Double baffled with the ported section taking up the rest. Slot ported to the drivers side with a 4" x 14.5" x 20" port to get around 47-48hz tuning from the ported section. Again after reading a ton on 4th orders I'm pretty sure I know less than I did when I started. Any critiques or suggestions are welcome. And if i screwed it all up thats cool too just a sketch at this point.

Next might be a 4 12 6th order if I like the 4ths output.
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I'm just gonna ask my landlord to hold the car up while I take the tires off. I mean, she's old and all but should be okay.

Last edited by rachidfunaki; 01-13-2016 at 04:18 PM. Reason: put volume meant dimensions doh
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Old 01-13-2016, 05:59 PM
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With that size sealed enclosure you're at about 60hz resonance. I modeled some larger sealed chambers though and you don't gain much by going larger...about 3dB at 20hz by doubling the size of the sealed section and no difference above 40hz.

The graph looks pretty smooth and it should sound great when cabin gain is factored in.
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Old 01-14-2016, 11:56 AM
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Thanks. Getting the wood cut today. I'll probably have it in and playing saturday. Hopefully it was worth 34.52 lol
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