First DIY -2 Ported 3.6cuft 12" Subs

After month's of reading threads on the Subwoofer & DIY forums i finally decided to build my own.

These subs will be replacing my (kef cube 2) subwoofer, which did a decent job I found,.. but I never had enything alse to compare to.


I wanted to thank all the forum members who answered countless questions and especially "Mayhem13" , who has basically designed the Subs & guided me from the beginning!!


Each Sub will have 3.6 cuft net and will have a Dayton RSS315 HO-44 Driver ,tuning will be 18hz and both will be powered by a Dayton SA1000.

I built a table "Sled" ,to be able to cut precisely lengths of MDF that extend further than my table fence .

Another tool that i bought is the Digital angle meter , great little tool that makes setting your saw angle, simple and very precise ( 1/10 of a degree)

Front baffle of the subs will be on a angle of 81.5 degree's and the Subs will be used as stands for the bookshelf's that will be built latter !!

I Finally got started mayhem !!

Hope you get to see pics, ...weird because i can see them on i phone ?

Gonna start the braces soon. I'll keep u posted !

Have fun with your fence

Braces are done in birch ply for superior strength. I used this triangular pattern for strength and since i needed a opening up the middle for the port.

The port opening coming out of a angled baffle was a little challenge.I hope the pics help my explaination ?

Had to glue part of the port to the first sheet of angled baffle. glued a coupling on port before cutting it at the right angle to give me more glueing surface. when dried made opening in center to insert router with angled shims attached, this way router is parrallel to port again and used pvc walls to guide the trim bit.... (I could'nt do port hole of both layers of baffle at once,2" trim bit was not long enoughto extend through double baffle+shims )

Now im glueing the second sheet of the baffle together and will repeat same method for port holes.

The box dimensions are H28 x 16W x 23D (top 19D)
I will be running (both) with one SA 1000 amp .



Made a jig to flare inner ports,i used Bondo and some MDF discs i made ,...went very well.

Heated the PVC with a propane torch, lubricated jig with some dish soap then pushed till reached flat base , let cool with wet rag then.....voila!!

Port is 26.15" long

UPDATE: Okay i've got most of the "Guts" of the sub completed. Need to add some Roxul insulation on just the backwall,... binding posts and the woofer wiring, before gluing the sidewall into place.

Since i could'nt add vertical bracing from top to bottom because of the port, I added some 45deg angles to help brace top and bottom panels.

Ports are going through braces at 1/4" gap, and are secured to to braces with silicone to try and minimize vibrations. IMG_1083.JPG 2169k .JPG file IMG_1084.JPG 1565k .JPG file
Edited by randyc1 - 12/14/12 at 7:14pm

Why are'nt my pictures posted right away like they were before in previous posts ??

Thanks Baniels !

i used my iphone camera just like the rest of pics?

That's excactly what im doing for the exterior port , the picture u see is for interior port.

Hey Mayhem, if you dont think it's a good idea ,i could cut the flare off ,and bring the total length back to the original 26.11 (I had forgotten the double baffle , 1.5" of port length) ??

26.11 is the lenght for a 18hz tune, now im about at 17.5 hz.???

thanks Mayhem.

IMG_1623.JPG 1508k .JPG file IMG_1621.JPG 1830k .JPG file Update on my Sub build,: I took a long break from the build ,but now they are almost completed,

I Dampened just the back wall with 2'' of Safe and Sound Roxul insulation, and was then ready to complete the enclosures ,


Continued with enclosure esthetics (roundovers) and sanded. Sealed with a oil based primer ( Zinnser Cover Stain) tinted grey,
which builds well ,seals the router edges very well and sands very well also!!
2 coats sanding in between and i was done.

Now im ready for the finished coats ?
Edited by randyc1 - 12/14/12 at 7:36pm

Just a few pics of my new Subs still on primer , they look pretty cool, and will look great with the bookshelves that i will eventually build to go on top ( Tarkus style).

They sound just as Awesome,!! creating a lot of deep bass and the impession of weight with movies. They are powered by a SA1000 .
I have not yet measured their FR with REW and am using no EQ yet.


Want to thank "Mayhem13" for all his help designing thes subs for me !!!!