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Old 15th May 2009, 03:24 AM   #1
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Question Driver Burn IN and Aging

We all know that drivers can go through some parameter changes when first used. But what about over a long time?
About 10 years ago I built an MTM using 4 of the well known Vifa P13WH. These speakers never got much use often going unplayed for a year at a time. Recently I decomissioned them to make some prototypes. After some stange results I measured them and the Fs was in the 150 to 160Hz range vs 65 to 70. I've run them overnight with a low frequency and only had maybe a 10 Hz drop.

Does anybody have suggestions as to what I might do? Or they destined to be midrangers forever.
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Old 15th May 2009, 06:54 AM   #2
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Strange - I would have thought the mech. Q would have changed, not Fs.
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Old 15th May 2009, 07:10 AM   #3
Ron E is offline Ron E  United States
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Just some observations, no direct experience with such a dramatic parameter shift. First, the Vifa woofers' Fs usually measured a bit higher than spec, 20% or so, IIRC. Drivers with rubber surrounds can have a strong temperature dependence, and while the rubber may look good, it can harden over time. Usually the surround doesn't dominate on suspension stiffness, though...
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Old 15th May 2009, 07:13 AM   #4
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David Weems mentions in one of his books on speaker design that the suspension on the P-13 is known to stiffen with time and does recommend using it as a mid-range
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