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In Reply to: felt on woofer dustcap - can it help muffle the peak and overtones? posted by freddyi on January 23, 2007 at 15:33:05:
Felt might not do it, depending on the mass of the cap and how much change you're looking for. If the cap is lower density than the cone it acts as a separate radiator, to prevent that you have to make its density closer to that of the cone, and felt may not be heavy enough to get it where you want it. Keep in mind that mass added to the dustcap increases Mms, lowers fs, changes Qes and Qm and a few other specs as well.
Follow Ups:
Your tendency to make things up is discouraging. The entire surface of the cone is a radiator, with its shape and construction contibuting to its behavior, i.e. pistonic, breakup, etc.
Your anonymous criticisms about things which you clearly have no understanding of is a waste of bandwidth. Come back with a name and a set of credentials and I'll be happy to debate you, but otherwise don't waste my time or yours because this is the last response you'll receive.
zip zap
I thought Bill's reply showed unfamiliarity with the issue at hand. What causes jagged response from the dustcap is breakup modes, and Fred's suggestion of adding a dustcap is done to damp them. It has nothing to do with adding mass or any of those kinds of things, which control pistonic behavior. The electro mechanical parameters Bill mentioned describe a speaker moving as a piston, and are purely linear parameters. Breakup modes are non linear, and cannot be expressed the same way.
Uh-huh. Don't have an explaination for your comments, do you? So what part of "breakup modes" do you not understand? Stop playing know it all. Nobody is buying it except newbies.
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