Sealed Sub Help!

[BeginnersLuck]

Hey, I just finishied assembling a 122L sealed box for one of my tempest drivers. The adire plans call for 32oz of polyfil. My question is do I need to stick the polyfil to the walls or can I just let it float freely in the box.

Any help is greatly appreciated...
-BL

[tryrrthg]

From what I've read is you can do either. I think I just read a thread about the 122L tempest over at HT forum and they told him to just stuff it in there...

Hope that helps.

link to the thread (http://www.hometheaterforum.com/htforum/showthread.php?s=&threadid=147165)

[burdette]

You want to tease the fill so that it is somewhat consistent density... in other words, DON'T just throw a wad in there.

You'll get different advice on leaving the space behind the driver clear vs. putting fill there. If you were using actual fiberglass, I'd leave the space clear AND put some barrier between the fill and the driver, like stapling in a very open-weave cheesecloth or something.

If you're using regular poly or something like AcoustiStuf, it isn't as much an issue.

Depending on the distance from the rear of the driver to the back wall of the cabinet, you may want to actually line the back wall with a 'non teased' piece, at least the 15" x 15" space RIGHT behind the driver.

If you're up for it, and if you've designed your woofer-mount for easy removal, experiment with different levels of fill. Try empty, just to see how it sounds, then stuff it half full, then completely full... listen each time, and determine the actual level of fill you like best. Or, just use what Adire suggests.. the 32oz... but do tease it so that you have a relatively consistent density throughout.

[BeginnersLuck]

Thanks guys-

I guess I'll have to give burdette's suggestion a try...I used t-nuts and machine screws to hold the driver in place so driver removal is no problem at all...

Thanks for the link tryrrthg...it proved to be helpful in my quest for DIY subwoofer happiness...

-BL

[burdette]

I used hurricane nuts and machine bolts for my 12" sub, and I *have* removed the woofer once or twice, but I can't escape the nagging thought that one of those interior nuts is going to come loose if I take the driver out too often. I even used plywood inserts to mount the nuts (rather than putting them in MDF), and used a strong adhesive on the plywood/nut joint.

That is why I said 'if you want to'... I'd want to if I'd built a sealed sub, but don't think I actually would if I had the same fear of loose nuts that I have now... Um... I'll let that stand. I read and read and READ before I built... I would feel 120% confident using Adire's suggestions.