[Jeffhulbert50]

what are your guy's thoughts on me offering Passive radiator parts (the assembly parts where the coil goes)

I have a few variances to the product its self. one sandwiches the spider while another piece sandwiches the cone. a different design has one part (think big flat washer) on top of the cone (under the dust cap) and one part under the spider and a bolt through them

benefits of plastic vs steel washers- more customizable size wise, colors if that matters, lighter start weight to help fine tune to your target tuning and its plenty strong.

heres an example of the spider clamping block. yes the material handles CA glue and activator fine

 

[Inferno333]

I think it's a good idea Jeff.

 

[Nudels]

would be nice to see a variant that easily allows adding or subtracting mass from,... or, a variant that allows you to adjust spider stiffness.

 

[Jeffhulbert50]

the part that I pictured above is an example of what I would offer, that's just one piece of 2. the way I see it, the spider and cone meet or there spaced. if they were spaced, you would need what is pictured and a similar piece that is slightly taller to fit in the cone neck to sandwich it. you would glue the sandwiched pieces together then run a bolt through the center hole to connect them with a not locking each section of the assembly in place (if that makes sense)

the other kind would be a triple joint type setup where theres a plastic washer above the cone under the cap and one below the spider which are glued to there respective piece (top washer to the cone, bottom to the spider) then bolted together. you would then add washers to the bolt to increase/decrease tuning

 

[adulbrich]

I liked the idea of using passive radiators, but the roll-off after tuning is ridiculous

 

[Jeffhulbert50]

ill leave the roll off/tuning and bandwidth to the guys that know more about it then me, I just want to help people be able to readily build them without rednecking the parts/assembly

 

[Jeffhulbert50]

parts are now on the site

[url]http://audiocontraptions.tictail.com/products/subwoofer-stuff/passive-radiator-parts[/URL]

 

[T3mpest]

Are you 3d printing this? You should 3d print a screw on dustcap assembly allow the weights to be added to the front of passive and then screw a dustcap cover on over the top of it.

That way tuning on the fly can be done without taking the passives out of the box like you normally do. Simply unscrew the dustcap, add weight and screw it back on.

I've been thinking about making some BEAST passive radiators and the only part I couldn't figure out how to DIY was the pieces you have here.... Bravo.

 

[T3mpest]

I liked the idea of using passive radiators, but the roll-off after tuning is ridiculous

Just 6db/octave more than ported. Still passives are not nearly as idiot proof since they have mechanical clearances, so proper SSF is a must. However they do have the advantage of taking up almost no space compared to a adequately sized port. They also suffer from less compression than most ports will as well.

They arent' something you use just to use, but when you NEED to use them in a design, there simply isn't anything quite like them. I had a trunk setup with 2 15's in 7 cubic feet tuned at 25hz. Good luck fitting a drop in box with a good sized port otherwise. Would have been like 10 gross as compared to the 7.5 gross it ended up being lol.

 

[Jeffhulbert50]

Are you 3d printing this? You should 3d print a screw on dustcap assembly allow the weights to be added to the front of passive and then screw a dustcap cover on over the top of it.

That way tuning on the fly can be done without taking the passives out of the box like you normally do. Simply unscrew the dustcap, add weight and screw it back on.

I've been thinking about making some BEAST passive radiators and the only part I couldn't figure out how to DIY was the pieces you have here.... Bravo.

Dustcaps are a very hard thing to print . I've been asked many times. The issue is layer overlap. It's sort of like cnc where you want to take a little less then half the mills width per pass to keep things clean. with a dust cap, the rise over run is so fast that the layers barely overlap like so they fall off each other. Only way to beat it is to increase the wall thickness but that exaggerates the weight and cost

 

[ludeman]

Curiosity killed the cat. Wanted to build a high power passive radiator just for fun.