Chevy Cavalier, Kerfed Port Build, 12" BTL

[antonmiller 8]

another vid

friday i will be testing on a term lab both boxes and will post the results.

[antonmiller 8]

just an update. i ordered the BTL. and installed both boxes. so far i cant tell a difference between the 2 but im still having over excursion issues. but hopfully the BTL reacts differently in these boxes then the BL. so here are some installed pics. please remember this is a temporary install. did no effort in hidding wires or making it look good. oh and ignore the giant scratch on the top of the tall box, had some issues getting it in the car. lol

[jcarter1885 995]

I likey the second box , both look great.

[cobra93 47]

Hey Anton, both boxes look like they turned out great.

I've got a question for you. I'm building a double kerfed box myself ( for 4 sa-8's ). When looking for some tutorials this is one of the threads I was watching.

I realize I was trying to do too small of a radius ( 2" id ) and I failed (I was so close), so I'm going to nip some 10 ga. steel to do mine.

It looks like your using particle board instead of mdf, does that hold together better for kerfing? Have you tried mdf?

I tried leaving different amounts of material, hell I even tried wiping it with a wet rag. The main problem was not all of the sections I cut would bend the same, even when wrapping the "wood" around a piece of 1 1/2 " pipe.

I curious to here your thoughts.

Thanks for your time.

[antonmiller 8]

so heres the results to all my testing with these boxes:

both boxes performed exactly the same, db numbers where spot on with each other, peak frequencies where the same (34 hz) and like i said they both provided me with a solid 147.5 @ 34 hz however, impediance rises where different, the tall box had a slightly lower imp rise, like .3-.5 higher than the short box. so in result the short box was more efficient then the tall box. so i sold the tall box. haha. short box did the db number at 1700 watts and the tall box did the number at 1900 watts

now i have a burp box that provides me with a 148.3 @ 42 hz @ 1900 watts

so box shape does have somthing to do with output, it just how nitpicky you want to get. i will do some more tests as the winter comes in and i have time to build more boxes, this time they will be strictly SPL orientated.

thanks for your time and i will not forget about my build logs next time haha

[antonmiller 8]

now to answer some question about kerfing, ive found by kerfing a few boxes that the time of the year and how humid and such the air is can make it diffeicult to kerf, like i bought my wood in the winter and we had to go through so much work to get the tuff to bend without breaking, then i built a kerfed port in the summer and it was much easier, im not sure if it has somthing to do with how new the wood is or if its just the actual tempurature in the place you are working.

but another note is that ive found this 11 layer birch stuff kerfs very very nicely, you dont have ot cut as deep as you do with the brittle mdf and it bends so smooth, all you do is leave the last layer of birch on the board when you set your depth and it take some persuation to bend it, but its bends very nicely, you dont get those little cracks or splits you get from mdf. try it out some time!

also for a 3inch kerf move the blade 7/16" every cut, cut 12 times leaving 10 ribs.