Speaker Playing 5 Hz Tone - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 07-31-2015, 01:43 PM - Thread Starter
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Speaker Playing 5 Hz Tone

Basically what happened was I got a base tone test on my phone which was plugged into my amp which obviously was plugged into my speakers. I pressed play and it played a 5 Hz tone. My speakers were moving A LOT and I almost instantly turned it off because I wasn't expecting that. The volume was not loud at all (but of course at 5 Hz i couldn't hear anything). The speakers are 8.5 inch JBL speakers and they are pretty old but sill in perfect condition. They are very good speakers, not some cheap stuff. I believe the cones have been replaced once because the old ones dried out and were no good. There is no visible damage to the cones and I played fairly bass heavy music after and they sounded just fine. So my question is, could the speakers have been damaged at all from my playing that 5 Hz tone and the speakers moving a lot?

Thanks for any replies.
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post #2 of 9 Old 07-31-2015, 01:46 PM
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They could be damaged by doing that; but since you say you've played them since then and they sound ok, it appears they survived intact. If they had been damaged, they would likely sound horrible now and it would be obvious.

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post #3 of 9 Old 07-31-2015, 01:47 PM
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Did you hear any wierd or clanking noise while the tone was playing?
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post #4 of 9 Old 07-31-2015, 01:48 PM - Thread Starter
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Originally Posted by Manamb View Post
Did you hear any wierd or clanking noise while the tone was playing?
Nope. I heard nothing
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post #5 of 9 Old 07-31-2015, 01:49 PM - Thread Starter
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Originally Posted by beaveav View Post
They could be damaged by doing that; but since you say you've played them since then and they sound ok, it appears they survived intact. If they had been damaged, they would likely sound horrible now and it would be obvious.
So your saying if they were damaged I would very obviously know?
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post #6 of 9 Old 07-31-2015, 01:50 PM
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Then I agree with beaveav's statement.
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post #7 of 9 Old 07-31-2015, 01:52 PM - Thread Starter
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Then I agree with beaveav's statement.
So your saying that they should still be in perfect condition, because when they were playing that tone the rim around the cone didn't seem to be getting all dimply or anything. They were just moving farther out then I had seen them do before.
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post #8 of 9 Old 07-31-2015, 03:35 PM
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post #9 of 9 Old 07-31-2015, 07:06 PM
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Essentially as you turn the volume up, the excursion would become greater and more forceful until the voice coil is rocketed out of its normal range to a point called Xdamage. I understand that this is a catastrophic event, not minor damage but total failure.

Alternatively, certain cones like paper cannot handle that much abuse and will suffer deformations am that eventually become permanent. This requires long term high power input and I am not sure that it can happen to this type of speaker.
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