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-   -   Use floor as one side of a port or mouth (https://www.diyaudio.com/forums/subwoofers/339442-floor-port-mouth.html)

Guerilla 22nd June 2019 12:43 PM

Use floor as one side of a port or mouth
 
Just a fast idea - Could one using a seal have the floor act as one side of a port or mouth in a ported or horn enclosure?

Cheers!

TBTL 22nd June 2019 12:52 PM

Yes, as long as the enclosure does not vibrate relative to the floor.

Guerilla 22nd June 2019 02:05 PM

Oh yes. I guess some weight and 3-point rest would be in order. Maybe use a piece of seal as each resting point?

tommus 25th June 2019 12:18 AM

I think the unbraced cabinet sides will be flapping from the sound pressure. I would not do this... just to save a piece of plywood? Or do you have very attractive floors?

Guerilla 25th June 2019 08:04 AM

Attractive floors could be a reason to do it. I dont have a project where i need it. Was just an idea. Your post made me think that yes it would need some bracing. Ive had an idea about a portable speaker where I could store a toolbag/bucket/toolbox to bring on my job. I guess the tools could use the bracing as part of the mount.

tommus 25th June 2019 12:07 PM

OK, let me clarify... a well-joined edge of a box is going to give you the best rigidity and "bracing" even if there is no actual "brace." It's like an I-beam versus a flat strip of steel, the geometry is what is making it stiff.

If you are pumping intense bass frequencies through a box that has corners without at least two faces meeting, it will "flap" and cause distortion. The larger the box is compared to the thickness of the box material, the worse this will be.

If you are building a portable system with a small subwoofer and are using stiff ply, then maybe an open edge/corner wouldn't be much of a problem.

Guerilla 25th June 2019 12:14 PM

Oh yes. Probably wont go after loud or very low extension for my portable boombox/tooltrolley?.


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