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Old 5th January 2011, 09:25 PM   #1
Studley is offline Studley  United Kingdom
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Default Driver sag

I have seen the opinion expressed that it is not a good idea to mount a LF driver horizontally (i.e. so it is firing downwards) because over time gravity causes the cone to sag. I would be interested to hear whether this view is widely accepted or whether it is open to dispute. I'm talking about a 15" driver BTW.
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Old 5th January 2011, 09:56 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
any driver cone will sag instantly when you rotate it to the vertical direction.
The sag may (/will) get worse as time goes on.

Even in the horizontal position the cone sags and uses up clearance of voice coil to magnetic pole.
Rotate the driver every other year to keep the VC near the middle of the magnetic gap.
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Old 5th January 2011, 11:32 PM   #3
Studley is offline Studley  United Kingdom
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Andrew
Your comment re rotation makes me wonder if we are talking at cross purposes. Just to make sure, when I say horizontal I mean with the cone facing straight down (from a ceiling). In that orientation rotating will not change anything as far as I can see.

BTW I have now done a sag calculation as shown on the Adire website and the driver is well below the suggested 5% limit, so I'm feeling happier.
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Old 6th January 2011, 09:57 AM   #4
AndrewT is offline AndrewT  Scotland
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glad you found the Adire calculation.
Yes, I was talking about the same thing, vertical mounting = facing the floor or ceiling.
Horizontal mounting = normal = facing the wall or listener.
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Old 7th January 2011, 02:25 AM   #5
djk is offline djk
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"BTW I have now done a sag calculation as shown on the Adire website and the driver is well below the suggested 5% limit, so I'm feeling happier. "

It will still sag over time.
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Old 10th January 2011, 01:08 AM   #6
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Quote:
Originally Posted by AndrewT View Post
vertical mounting = facing the floor or ceiling.
Horizontal mounting = normal = facing the wall or listener.
I would find that confusing and have always referred to it the other way around.
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Old 10th January 2011, 07:16 AM   #7
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Originally Posted by Cal Weldon View Post
I would find that confusing and have always referred to it the other way around.
I would agree.
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Old 10th January 2011, 09:01 AM   #8
djk is offline djk
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I would prefer to use vertical for facing wall or listener.
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Old 10th January 2011, 09:23 AM   #9
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Originally Posted by Cal Weldon View Post
I would find that confusing and have always referred to it the other way around.
Just to add confusion, in the PA world, it has yet another meaning, vertical being the standard way we look at a rectangular box, i.e. tweeter on the top, with mid and bass below, facing the listener, and horizontal, with the box on it's long side, drivers side by side, still facing forwards.
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Old 10th January 2011, 02:42 PM   #10
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Ya PM, I don't think that's confusing, as you're talking the box versus the driver so no problem there.
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