Three points define a plane? - Home Theater Forum and Systems - HomeTheaterShack.com

Old 01-26-08, 02:17 AM Thread Starter
Shackster
Brian

Join Date: Jul 2007
Location: Kansas City, MO
Posts: 17
Three points define a plane?

So, what is better for a subwoofer- 3 feet or 4 feet? It seems to me that 3 feet has a better chance of sitting flat on the floor ... am I missing something more important?

I'm building two fairly heavy Rythmik 15's and I haven't really give the feet\spikes much thought until now.

Thanks in advance for whatever input you might have.
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Old 01-26-08, 08:19 AM
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Geoff

Join Date: Dec 2006
Location: Winnipeg, Canada
Posts: 413
Re: Three points define a plane?

With 4 spikes you will have to make adjustments to get all 4 to touch the ground unless both the bottom of the sub and the floor are very close to being perfectly level. Rubber feet will be more forgiving since they should compress to some extent. 3 feet/spikes won't require adjustment as per the title of the thread.
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Old 01-26-08, 11:36 AM
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Josuah

Join Date: Apr 2006
Location: San Jose, CA
Posts: 636
Re: Three points define a plane?

If the mass distribution is such that the tipping point can be easily reached by pushing in the direction between two of the three feet, then it'll tip over. A tripod won't tip by itself if the legs keep the center of mass in the middle, but what happens when something bumps it?
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Old 01-26-08, 11:48 AM
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mrstampe

Join Date: Nov 2007
Location: Springfield, IL
Posts: 220
Re: Three points define a plane?

Quote:
Josuah wrote: View Post
If the mass distribution is such that the tipping point can be easily reached by pushing in the direction between two of the three feet, then it'll tip over. A tripod won't tip by itself if the legs keep the center of mass in the middle, but what happens when something bumps it?
I was about to make the same point. Specifically if you have children, go with the 4 foot design to avoid damage to any of your babies -- human or subwoofer type.

Mark
Springfield, IL

GO MIZZOU!
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Old 01-26-08, 01:40 PM
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Geoff

Join Date: Dec 2006
Location: Winnipeg, Canada
Posts: 413
Re: Three points define a plane?

The center of mass of a tripod stand (ie camera) is considerable higher off the ground than a typical subwoofer. Unless the subwoofer is very tall compared with the dimensions of its base then it shouldn't be an issue.
Geoff St. Germain is offline
Old 01-26-08, 01:54 PM Thread Starter
Shackster
Brian

Join Date: Jul 2007
Location: Kansas City, MO
Posts: 17
Re: Three points define a plane?

Thanks for your replies.

I'm thinking two feet in front and one in the back. The sub design is down-firing and the amp will be over the rear foot, so I'm expecting the center of gravity to be pretty low. Another reason I was thinking three feet is that I won't need to buy adjustable spikes\feet.
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