15" of pure pleasure

[blktre]

Re: 15" of pure pleasure

the mdf was 1 inch thick so it was easy to glue and screw to the 4 sides. the back wall is 2 inches thick and the front baffle is 2 inches thick. over kill for 12 inch subs. The front baffle does not flex the back does not flex. the sides do not flex. in your case I would do the 2 inside braces. tie them to the 4 sides. then tie the two baffles with 2 wooden closet rods to each other and to the front and back of the box. it is not hard to do . i will draw a picture on wed. phil

uhoh, your 22" cube just grew an inch:eek:

[Green Machine Mowing]

Re: 15" of pure pleasure

in your case I would do the 2 inside braces. tie them to the 4 sides. then tie the two baffles with 2 wooden closet rods to each other and to the front and back of the box. it is not hard to do . i will draw a picture on wed. phil

ok, thanks phil, i very much appreciate all of your help on this project so far!

[Green Machine Mowing]

Re: 15" of pure pleasure

phil, can i pretty pretty please get that drawing??

[philiparcario]

Re: 15" of pure pleasure

spaced it out. i will get to it in the morning. sorry phil

[philiparcario]

Re: 15" of pure pleasure

see this link.

http://www.mfk-projects.com/images/Home%20Theatre/assembly%201.JPG

see the baffles double for the front one inside about 7 inches then a second inside about 14 inches then a solid back. I will open my nht 1259 woofer up to show you what I mean . phil

[philiparcario]

Re: 15" of pure pleasure

pe forum screwed up my nht shots are in the wrong


thread.

http://techtalk.parts-express.com/attachment.php?attachmentid=1463&d=1228370043

http://techtalk.parts-express.com/attachment.php?attachmentid=1464&d=1228370083

http://techtalk.parts-express.com/attachment.php?attachmentid=1465&d=1228370114

http://techtalk.parts-express.com/attachment.php?attachmentid=1466&d=1228370143

http://techtalk.parts-express.com/attachment.php?attachmentid=1467&d=1228370176

[philiparcario]

Re: 15" of pure pleasure

shots of inside the box for the nht 1259 this is the braceing you need. phil

[Green Machine Mowing]

Re: 15" of pure pleasure

should i do a roundover on the back of my baffel?? i think perhaps a 1/4" roundover. the screw holes are so close to the cut out that im worried that anything bigger and i will start loosing strength. also i was going to round over my braces, but the holes will probly be 14 or 15" across, so the air will probly be moving so slow that it wont effect anything. what do you think??

[johnastockman]

Re: 15" of pure pleasure

should i do a roundover on the back of my baffel?? i think perhaps a 1/4" roundover. the screw holes are so close to the cut out that im worried that anything bigger and i will start loosing strength. also i was going to round over my braces, but the holes will probly be 14 or 15" across, so the air will probly be moving so slow that it wont effect anything. what do you think??

You mean around the inside edge of the driver hole? I used a 1/2" round-over on the back of this baffle:




I didn't round-over where those threaded inserts are, allowing the max depth of the material for the insert and machine screw. I've seen some guys use a chamfer bit at a 45 degree angle, also. For your braces, you can do the edges of the braces, but I don't think it would make a difference. I made a 2.3 ft3 sub and used 1.5" thick x 3" wide pieces for the bracing side to side, top to bottom, amd one front to back. I didn't round over their edges...the sub works very well and exceeded my initial expectations. Of course, here, I did round-over the holes in the braces:



But that is a much smaller cabinet, about 17" high and 6.5" wide, MTM style...approx .4 ft3. But, I doubt I could hear any difference between a pair with rounded-over bracing and a pair without.

John A.

[Green Machine Mowing]

Re: 15" of pure pleasure

You mean around the inside edge of the driver hole? I used a 1/2" round-over on the back of this baffle:




I didn't round-over where those threaded inserts are, allowing the max depth of the material for the insert and machine screw. I've seen some guys use a chamfer bit at a 45 degree angle, also. For your braces, you can do the edges of the braces, but I don't think it would make a difference. I made a 2.3 ft3 sub and used 1.5" thick x 3" wide pieces for the bracing side to side, top to bottom, amd one front to back. I didn't round over their edges...the sub works very well and exceeded my initial expectations. Of course, here, I did round-over the holes in the braces:



But that is a much smaller cabinet, about 17" high and 6.5" wide, MTM style...approx .4 ft3. But, I doubt I could hear any difference between a pair with rounded-over bracing and a pair without.

John A.

yes i was refering to making a roundover on the back of the driver cutout. i think that ive read that it will allow the air to flow around the edge more smoothly. i feel its probably expecially important due to the 1 1/2" baffel.

[johnastockman]

Re: 15" of pure pleasure

yes i was refering to making a roundover on the back of the driver cutout. i think that ive read that it will allow the air to flow around the edge more smoothly. i feel its probably expecially important due to the 1 1/2" baffel.

For a 1.5" baffle, at least a 1/2" round-over, I'd imagine, or a 45 degree chamfer bit. That baffle in my pic is 3/4" and I still needed a 1/2" round-over because of the way the drivers' frame is designed...with the driver fitted in there without the round-over, the back wave from the little woofer looked pretty restricted.

John A.

[Green Machine Mowing]

Re: 15" of pure pleasure

For a 1.5" baffle, at least a 1/2" round-over, I'd imagine, or a 45 degree chamfer bit. That baffle in my pic is 3/4" and I still needed a 1/2" round-over because of the way the drivers' frame is designed...with the driver fitted in there without the round-over, the back wave from the little woofer looked pretty restricted.

John A.

im not sure that we have a 1/2" roundover at school. i know we have 1/4" and 3/4". ill probably go with the 3/4" to let that baby breathe

[Green Machine Mowing]

Re: 15" of pure pleasure

i got my baffel, top, back and bottom all glued together, and cut the hole in the second baffel to slide behind the primary one and rounded over the back. when i test fitted it the holes in the baffels didnt align exactly,there is a slight overlap here and there, less then 1/16th will this effect anything or is it ok?? thanks for your reply.

[Green Machine Mowing]

Re: 15" of pure pleasure

instead of dowels, im thinking of using two peices 1 1/2" wide peices of mdf laminated togeather, basicly to make a 1 1/2" square of mdf that i could use to brace my large shelf braces with holes cut in them. would this be a better method? i would be using scrap, so it certanly would be cheaper/free

[johnastockman]

Re: 15" of pure pleasure

instead of dowels, im thinking of using two peices 1 1/2" wide peices of mdf laminated togeather, basicly to make a 1 1/2" square of mdf that i could use to brace my large shelf braces with holes cut in them. would this be a better method? i would be using scrap, so it certanly would be cheaper/free

I do that quite often to save money and use up some scrap. I glue up two pieces of MDF for 1.5" like you mentioned. My pieces are usually about 3-4" wide, but a 1.5" square piece would work too.

John A.