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Author Topic: Bt-12 speaker tilter.  (Read 15811 times)

Stephen Kirby

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Re: Bt-12 speaker tilter.
« Reply #50 on: December 16, 2015, 07:10:06 pm »

It looks like the GC on the Community is a bit higher than the typical 2 way.  How much pressure forward does it put on the pole?
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Robert Patch

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Re: Bt-12 speaker tilter.
« Reply #51 on: December 16, 2015, 07:56:42 pm »

It looks like the GC on the Community is a bit higher than the typical 2 way.  How much pressure forward does it put on the pole?

That's a big ass speaker to put on a tripod at 70 lbs.  I thought the FA22ac was big at 60 lbs.
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Ed Hall

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Re: Bt-12 speaker tilter.
« Reply #52 on: December 16, 2015, 09:32:09 pm »

It looks like the GC on the Community is a bit higher than the typical 2 way.  How much pressure forward does it put on the pole?

It sits nice on the BT-12 to about 8-9 degrees. Any further and the CG is forward of the pivot and will slide to 12 degrees on its own. It is still much less pressure than with other tilters. I'm very happy with it. I think it will work well until I can get my SM80s
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Tim Weaver

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Re: Bt-12 speaker tilter.
« Reply #53 on: December 16, 2015, 10:44:57 pm »

Better than with the K&M's I bet!

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Nimrod Webber

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Re: Bt-12 speaker tilter.
« Reply #54 on: December 17, 2015, 12:58:01 pm »

It sits nice on the BT-12 to about 8-9 degrees. Any further and the CG is forward of the pivot and will slide to 12 degrees on its own. It is still much less pressure than with other tilters. I'm very happy with it. I think it will work well until I can get my SM80s

The thread array in the SLS920 that takes that external top hat seem to be located inline with the cab's COG which is perfect for normal/vertical use.
When the cab is tilted, the added height results in a substantial shift of the COG which loads different parts of the tilter and stand assembly, including the base (top hat or thread attachment on the sub). This loading may be beyond what they were designed for.

Although the cab's weight is nicely within the load limit of the BT-12, that rough behavior of the tilter in the higher angles is definitely a sign that the COG height in this setup is way higher then the range that the tilter is designed for (between 200 and 370mm (8" 14.5") from the bottom of the cab, when resting on the rubber foot).

:)
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Chuck Simon

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Re: Bt-12 speaker tilter.
« Reply #55 on: December 17, 2015, 01:52:21 pm »

I wonder how it will work on the SRX 835P?
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Jay Barracato

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Re: Bt-12 speaker tilter.
« Reply #56 on: December 17, 2015, 02:01:17 pm »

I have repeatedly put hpr152's on mine on top of ts99s at the minimum height. Yes the center of gravity moves forward but not excessively. I just make sure the CG is directly over one leg of the tripod ( the ts99 have a wider base) and everything is as stable as any usual tripod setup.

Sent from my XT1254 using Tapatalk

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Jay Barracato

Nimrod Webber

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Re: Bt-12 speaker tilter.
« Reply #57 on: December 17, 2015, 02:41:58 pm »

I wonder how it will work on the SRX 835P?
Should be ok. I see no mention in the specs of the COG height, but with the amp located at the bottom of the cab, the woofer being double ferrite and both mid and high drivers are neodymium, I estimate the COG is around 2/5 of the total height which comes to 390mm. That is just over the top range of the recommended COG height. Tilt ahead...

 :)

 
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Dave Garoutte

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Re: Bt-12 speaker tilter.
« Reply #58 on: December 17, 2015, 07:40:19 pm »

To find the actual center of gravity is quite easy.
Lay the speaker face up or down on a 2x2 board.
Move it until it balances and you have the CG in one plane (it is on the vertical line from the balance point).
We can assume that the speaker manufacturers put the pole mount under the CG in the other relevant plane.
The intersection of these two lines is the CG point.
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Nimrod Webber

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Re: Bt-12 speaker tilter.
« Reply #59 on: December 18, 2015, 03:03:56 am »

To find the actual center of gravity is quite easy.
Lay the speaker face up or down on a 2x2 board.
Move it until it balances and you have the CG in one plane (it is on the vertical line from the balance point).
We can assume that the speaker manufacturers put the pole mount under the CG in the other relevant plane.
The intersection of these two lines is the CG point.

+1
But for the sake of the subject on hand, only the height of the COG (point) is relevant.
Here is a sketch I made once of how to find a cab's COG height:



 :) 
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ProSoundWeb Community

Re: Bt-12 speaker tilter.
« Reply #59 on: December 18, 2015, 03:03:56 am »


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