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03-27-2008, 09:48 AM
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#1 |
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Member (11 bit)
Join Date: Mar 1999
Location: somerville,mass usa
Posts: 1,270
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is this called a "passive" woofer?
took apart two old EPI 200 three way loouspeakers
found woofers with no electrical connections!--e just mounted in the enclsoure with no electrical connections! I guess they are meant only to produce bass via vibration?? strange design to me--but wonder if this method was used in 1970s (vintage of this speaker) to achieve "super" bass??? tx |
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03-27-2008, 10:31 AM
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#2 |
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Forum Administrator
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Premium Member
Join Date: May 2000
Location: Joplin MO
Posts: 36,460
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Yes, that's called a passive radiator.
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03-27-2008, 11:50 AM
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#3 |
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Techphile.
Join Date: Nov 2003
Location: San Francisco Bay
Posts: 5,746
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I built a speaker cabinet with a passive radiator a long time ago. It pretty much does the same thing as a tuned port. Allows some of the pressure out of the inside of the cabinet at a distance from the primary driver so as not to cause partial phase cancellation...it effectively boosts the sound pressure and lowers the frequency response by making the driver "think" its a larger cabinet than it is.
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