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Hello this is my first actual post to this forum so my apologies if any errors are made.

I've been designing my first diy sub enclosure for 2 Dayton ultimax 18s and just want some feedback from anyone with experience.

The main use of the subs will be for music, but the music I listen to has a lot of low's and also some movie watching in a pretty small room maybe 10' x 10' x 8'
I'm a basshead so I love tons of bass. Albeit clean accurate bass. Im replacing a prefab 2 12" Kicker CompR setup with these and am expecting much cleaner bass response than those budget ones can provide. Also the lows were entirely missing. I got the kickers for free so I can't really complain about that.

I designed the box in bassbox 6 pro to be ported, internal vol 29.947~ cu.ft roughly. I haven't subtracted the subwoofers from the total nor the bracing if needed however if I lose some cu.ft the tuning will only go a bit higher according to the graphs which I can live with and have accounted for as a guesstimation. Do call me out if im wrong on that.

The dimensions are external A:76" B:33" C:24" with a wall thickness of 3/4" MDF Box tuned to 12.08Hz I was figuring after I lose some cu.ft from what I stated above the tune should be somewhere around 13Hz. Damping was set to minimal though I don't know if I will put any in, Please provide opinions on that as well. The port itself is to be in the top of the enclosure 8" x 11" x 50" on one of the 33" pieces of wood in the back middle using just 3 pieces of seperate 3/4" thick MDF (I added the total that will be displaced by the port which came to about 0.609 cu.ft) Do let me know if im crazy with what I expect the ultimax's to be able to do or if im in the ballpark of something that would sound good.

I already have the Dayton's and I will be powering them using a single iNuke 6000DSP.

Side question, Do you think I need to put some internal bracing so the subs dont blow the box apart? If so, Where? Im not opposed to adding another 3/4" sheet of MDF to the front of the box for extra support if needed.

As stated any info or opinions would be greatly appreciated.
Thank you for your time and patience.
 

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Forgot to add in they will both be wired for a seperate 4 ohms into each channel of the iNuke. Also I will be using a roundover bit on both ends of the rectangular port.
 

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It sounds like you've done a reasonable amount of homework... the UM18's are a very capable driver, especially in that price bracket. What we're missing here on the subject of "what [you] expect the ultimax's to be able to do" is a level. If you're expecting reasonably flat response with some EQ or DSP down to 13Hz, but at 1-20 watts, then I suspect you're in the right neighborhood. However, it's hard to say what's really going to work without knowing what sort of levels you're expecting to produce in your room.

I'm not sure I understand your port orientation/dimensions... can you clarify? Perhaps add a picture?

As for bracing, yes. Add some. you've got some very large panels, and if they aren't braced/dampened in any way they're going to do a lot of vibrating. That's never what you're looking for in your sound.
 
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