Alright SPL guys, what is the deal with the dowel rods in large enclosures?

[Kangaroux 5,000+ posts]

Does the dowel and MDF used as support need to be subtracted from the air space?

If you do a window design I would subtract that but tbh it's probably not worth the effort to try and figure out the air space used by the dowels lulz

 

[slim2fattycake 10+ year member]

I would, its just a pi/4(D^2). Not hard or time consuming really. Plus what if you got like 5+ of 2" dowels over 30 inches long?

 

[JL Audio 5,000+ posts]

RAM used 6 dowels in my design for 8 12s and suggested 1-2 more where I can fit them, definitely will help with flex issues and take up little space.

 

[psychoacoustics 10+ year member]

there is a misconception here real SPL guys dont use dowels period ive see the loudest cars in the world and none of them do this crap

thats an sq thing to stop/reduce box vibrations it helps when you listen to music not when you burp laminar flow is what you need in spl dowels and shelf bracing hurt not help spl they dont help spl

 

[slim2fattycake 10+ year member]

true but then triple or double layering each panel or concrete is what they use to stiffen the box without obstructions and so its a way of dampening flex anyways.

 

[RAM_Designs 5,000+ posts]

there is a misconception here real SPL guys dont use dowels period ive see the loudest cars in the world and none of them do this crapl

Not everyone is trying to break world records though.

 

[SPLAudioHz 10+ year member]

Ram, is the cu ft (air) space in your enclosures equal to that of the requirement of the subwoofer? Also do the subs, for the enclosures that house the entire sub, need to be inverted? Or can I just house two 12s and give them what they need and be done with it? Or is there more involved? Yeah lots of questions. Thanks a lot guys. I cannot go wrong with this forum.

 

[psychoacoustics 10+ year member]

Not everyone is trying to break world records though.

judging by attendance id agree with you

but the OP asked SPL guys not regular caraudio guys thats why i answered

j

 

[RAM_Designs 5,000+ posts]

judging by attendance id agree with you
but the OP asked SPL guys not regular caraudio guys thats why i answered

j

I used dowels when I was competing for a short time. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif I guess I was just trying to say that there are a lot of casual competitors that still use them. I understand that more serious competitors have more reason to go all out.

 

[bhsdriller 10+ year member]

Try to stick with 1.25-1.5". A good way to get a larger bracing point is to cut your dowel 1.5" shorter than the span you're bracing. Use a hole saw to cut 2.5-3" diameter circles out of MDF to put on each side of the dowel, and you have yourself more surface area contact than a 2x4 while taking up 1/3 the space.

great idea....never thought of that

 

[RAM_Designs 5,000+ posts]

great idea....never thought of that

I'm full of all sorts of ideas. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif