Rubber Ball Brace [message #46773] |
Wed, 27 April 2005 12:56 ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18758 Registered: January 2001
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Illuminati (33rd Degree) |
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For those of you building seven π or eight π speakers, or anything else with a π midhorn in a cabinet, here's a neat trick you'll want to do.Get a tennis ball or similarly sized rubber ball and cut it in half. You can actually find a wall protector at hardware stores that works perfectly. That's what is shown below. It is used as a door stop to protect the wall from a doorknob going through the sheetrock. Anyway, take two hemispheres and put them on either side of the magnet vent hole before fastening down your access panel. It will act as a brace for the panel. ![](http://www.pispeakers.com/misc/Rubber_Ball_Brace.jpg)
I always hated access panels because they are prone to vibration. Any panel large enough to fit a 10" or 12" speaker through is large enough to vibrate. I don't care how rigid the rest of the cabinet is, and it doesn't matter if the panel is very solid, it always seems to be a trouble spot because you can't put a fixed brace in place. I put wedge shaped braces on each of the four sides of the horn flare, so it and the cabinet surrounding it are solid as a rock. But without these rubber braces, the access panel wouldn't have any other mechanism to brace it. Put these in there and squish them down when you tighten the panel and viola! - The panel is preloaded and well braced. It will make that back panel as solid as the rest of the cabinet. You'll really hear the difference in the low keys of the piano, so do this step for sure.
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Re: Rubber Ball Brace [message #46779 is a reply to message #46773] |
Wed, 27 April 2005 17:48 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
Russellc
Messages: 397 Registered: May 2009
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Illuminati (1st Degree) |
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My A7s have such a panel, the whole back removes (828 cab) I deaden it thusly: My a7s are in the corners, and the corner void behind the speaker is stuffed with pillows. also makes a first rate cat bed also. Obviously this wouldn't work for the corner Pi horns but my help in cases where square box speakers are in corner positions.Regards, Russellc
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Re: Rubber Ball Brace [message #46787 is a reply to message #46780] |
Thu, 28 April 2005 07:45 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
Russellc
Messages: 397 Registered: May 2009
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Illuminati (1st Degree) |
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Fortunately, they ignore the cones now. when they were new, one cat stared at the cone of a 515 8G, looked at me and pounced! scratch one driver cone. Oh well, great plaines fixed it up. russellc
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