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In Reply to: RE: Observable Woofer Cone Movement posted by House13 on April 20, 2015 at 07:29:39
necessarily indicative of a driver reaching its design limits. Excursion is quite normal when reproducing bass from the first couple of octaves.
As for me, I cannot think of a woofer that does not visibly move to some degree when playing low bass. That's how it moves air!
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Woofer movement?A band I see regularly added a Roland 808 bass sample to their arsenal via trigger, and without the FOH guy's prior knowledge (or sound check for level).
They shared in the repair costs of a JBL 18" speaker. The engineer said that in his many years of live sound work, he had never seen a speaker cone so distended. It was literally touching the heavy metal grille of the dual 18" SR sub cab.
"He 'launched' that bastard", was how he described it ...
http://mindseyemusic.blogspot.com/
Edits: 04/22/15
My dispute is with the very large degree of cone movement. This loudspeaker has four 9 inch bass drivers. I have had speakers, as in the example I gave in my first post, using only one driver with no perceptible cone motion. However, I have seen this effect in cheap mid-fi and PA loudspeakers even with multiple low frequency drivers.
I cannot understand the necessity for such large cone movement in a multiple driver system versus the absence of the effect in a loudspeaker with only one bass driver. Certainly the quality and quantity of the bass is not diminished in any way in my experience with such loudspeakers as the Avalon Eidolon with an 11 inch or the Gallo Ref 3.5 with a 10 inch woofer.
large woofer movements were normal, whether or not any bass instruments were playing. It depended on how warped your LP was. Preamps used to have low filter switches specifically intended to roll off extreme low frequencies to damp out such movement.
JE
Look at the specs of any woofer. You will see a value for Xmax, usually in mm. A modern sub driver will have quite a bit of cone movement.
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Yes, I know. This post should have been a level higher.
we're on the same page.
While stats dominate my two music systems, the Polk LSi speakers in the bedroom and HT sure move. Along with the vintage Advents I use periodically in the garage when playing something with 20-80 hz content.
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