Finally, some SDX designs...

People have been asking me for SDX 15 designs, here is my first of 3

This one is an 8 cubic foot slot port design, tuned to 18Hz, great for big rooms or people who want lots of output, I'd power it with 1000-1500watts. A highpass filter would be nice, you could have it pretty low if you want, maybe 12Hz.



External dimensions are 27.75" high, 23" wide, 33.5" deep.

Here is the sketchup document, I designed the cabinet to be pretty strong, 1" walls all around, I took the cutting loss into account so all sides are actually 7/8". I think it would look nice in an all baltic birch ply box.

Up to come are the SDX 15 LLT and SDX 15 PR setup

The LLT will be 13 cubic feet and tuned to 14Hz, designed to be used with one of those 7" acoupower ports but lengthened to 34". The LLT can take 500-1000watts

I am excited about the PR setup, even though it will only have about 1 cubic foot less of effective internal volume from this slot ported design, it will be much smaller due to the absence of the port, and it will have a deeper tune.

More to come this evening and tomorrow...

***EDIT _Updated with baffles

 

SDX 15 slot port.zip 22.3349609375k . file

Alrighty, here is the EBS box for the SDX, I decided to really go for a low tune, around 12.5Hz, it only has a 6" port but the chuffing doesn't become a problem until 13Hz or less at max output down there. I am not crazy about it, but I wanted a super low tune since this sub can handle it. You guys should get very solid 10Hz extension in room with this design, no commercial sub that I know of can do that, its 4.5dB down at 20Hz, 6dB down at 12.5Hz and 10dB down at 10Hz, that is REAL nice, I have attached a sketchup document with it and its cut list.



This design is for 3/4" mdf, if one of you is gonna build it in BB, and the thickness is different in your area, I can do another version per your request.

 

SDX15 EBS.zip 24.0693359375k . file

Its about time...

I had to do a rough model of the sdx, I didn't know what I was doing at the time if I were to take the time to do it again, it would be much better, I didn't have any good pics when I did it. I also did a very crude model of the PR's just so I could see how things fit in the cabinet. This guy is quite small actually, I was going for a box kinda like the def tech supercube trinity, this one may have very similar output due to the fact that I have just as much PR area, a larger enclosure, and quite possibly similar driver displacement, I don't know what the excursion is on the Def tech's but somehow I don't see it being in the same league as the SDX.








Exterior dimensions are 21.75" deep X 21" wide x 32" high internal volume is around 6cubic feet after braces and driver/pr's, tuning should be right around 17Hz, with some stuffing and some added mass to the cones (up to 500grams each) you should be able to under 15Hz tune without a hitch, but personally, I'd stick with the 17Hz tune.

Thats a big room, personally, I wouldn't worry much about going deep, I would do one or two of these slot ported designs depending on your budget. You have to remember that even this slot ported sub digs a lot deeper than most. Finding HT subs with sub 20Hz tuning is hard. SVS/HSU do this but they only use 12" woofers, not 15's with 30mm xmax, lol. Also, their subs have too small of port area at the lower tunes anyway.

Wait, I am having a hard time understanding this, why do you want the slot port 33.5"? That dimension is the width that you want the front of the port to be right? If you want the slot ports to fire into the toe kick area, do you want the drivers to fire the same direction as the ports?

Right now the port has a cross area of 53 square inches and is about 47" long. You can change the shape of the slot port all day as long as you keep the same cross area and length, if you change the amount of area, you need to change the length, you can model this yourself in winisd. I do not recommend super thin slot ports though, with lower output drivers you can do 1.25 or 1.5" high ports, but with a driver this capable, I wouldn't go any less than 2". If you were to go 33.5" wide and 2" high, you'd have to make the port 16" longer to maintain your tune, also the box would have to be bigger to do this larger port.

Also, an IXL would work very well in this box, I am going to add a couple cross braces tonight.

Right, I try to keep them as non slit like as possible, I have seen people use quite a bit more than an 8:1 ratio before. Since a 33.5" wide vent would be giving you such a massive port area, the ratio isn't as important as the minimum dimension. Either way though, your right you don't want them too wide, I wouldn't do something that wide, perhaps he could consider doing a pair of drivers in that size cabinet and up the height of the port a bit.

Ahh, that makes perfect sense. All you need to do is take 3" off of one end of the port where it lies flush into the front of the box and add it to the top rear of the port where it opens to the driver, now this top rear part of the box will become the bottom front, its just common sense. Also, you would have to change the baffles around a bit, you obviously wouldn't need the double baffle on the top of the box. You may not need to double up the new front of the box if you reposition the internal braces so that each one lies flush with the edge of the driver cutout. You then wouldn't need that fancy circle brace but could do two of the braces with 4 simple rectangles cut out.

Yeah, lemme make those changes I described above so you can see them.

Here, I think this is what you want

Yeah the IXL would work very well in this exact same enclosure. Keep in mind that I changed the design on this vertical version, the driver is no longer flush mounted. To flush mount it, you will have to double the baffle to give you the strength necessary.

BTW, a lot of subs can be put in this enclosure, it works very well for quite a few such as...
TC2000
Rl-p15
Fi Car Q15

You can take the last bend out of the design and higher tuned ED 19Ov.2 would work very well, about 23Hz tuning, lots of output and power handling. You could also add a bend and use an acoupower 15 with 16Hz tune, you need another 15" or so of port length though, or you could make the port smaller which I don't really recommend though.