Do you turn your drive units through 180 degrees to counteract the effects of gravity on the suspension over time? If so, how often? I did it on some old KEF bass drivers when the voice coil started rubbing. It did the trick, for a while . I wonder whether this is good idea to do with all drivers periodically, intuitively it seems so.
Only of they're a Leslie.
The speakers in a Leslie are mounted horizontally. I don't think this represents Scottjoplin's point .
Btw, some older models feature a Rotosonic TM drum which is a vertically mounted speaker, usually 6"x9", that rotates around a vertical axis.
Best regards!
If the manufacturer thought it necessary I would imagine they would have a mention about it in the speaker info that came with the speaker. Large systems....never seen or heard a mention on it. I would think if you have a problem with coil drag its probably time to do something with the driver like a recone or diaphram replacement.
Good idea, I hadn't thought of less than 180 degrees, but that makes sense, evens out the wear more.I rotate 90 degrees, rather than 180. No set period between rotations. I've probably come full circle on my main system in it's 10 year life.
What made you do it now? Were they having "issues"?I've only recently turned the drivers of my Mordaunt Shorts through 180 degrees.
This is the first time I've done so in 30 years of ownership.
Sorry, can't follow the logic here I can think of a couple of reasons off the top of my head why they wouldn't mention itIf the manufacturer thought it necessary I would imagine they would have a mention about it in the speaker info that came with the speaker. Large systems....never seen or heard a mention on it. I would think if you have a problem with coil drag its probably time to do something with the driver like a recone or diaphram replacement.
Well, my HIVI M12's have 12 fixing screws, so, hey.....120° anyone? + or - ?
It's a great question...one I've thought about a lot since building a PPSL sub that puts the drivers in horiz position, because I was warned about cone sag doing so.
I contacted the driver manufacturer (BMS) and was told, "yes be concerned with sag...the voice coil weighs over half a pound."
After thinking about sag situations and doing bit of research, I've come to the conclusion that any larger drivers with heavy-ish coils, or lighter-ish cone/suspension structures, probably need periodic rotation, especially when they leave vertical alignment. But that many (most) home audio drivers probably don't.
On the PPSL subs, I run a small DC voltage, 0.7v, on the drivers when subs aren't in use.
This lifts the coil the right amount to offset the gravitational sag.
I contacted the driver manufacturer (BMS) and was told, "yes be concerned with sag...the voice coil weighs over half a pound."
After thinking about sag situations and doing bit of research, I've come to the conclusion that any larger drivers with heavy-ish coils, or lighter-ish cone/suspension structures, probably need periodic rotation, especially when they leave vertical alignment. But that many (most) home audio drivers probably don't.
On the PPSL subs, I run a small DC voltage, 0.7v, on the drivers when subs aren't in use.
This lifts the coil the right amount to offset the gravitational sag.
I go one further than that. I rotate them a full 360º.I rotate 90 degrees, rather than 180.
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