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In Reply to: RE: Tympani IV vs IV-A? posted by Roger Gustavsson on November 10, 2014 at 05:38:37
My bass panels were restored at magnepan, one a couple of years back and one 15 years ago. They measure about the same and not off from the numbers on the frame. The 40 hz must have been measured before the speakers broke in to any extent.
I must say 46 and 55 is not a close match. Are they both the same type panel?
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The T-IIIA low bass panels are without buttons. The lower section of the driver is tuned to 55 Hz, the upp to 46 Hz. These have heavy copper wiring. Mine are now 39 years old...
The mid bass panels are tuned to 55, 70 and 80 Hz, two buttons on each panel.
The midrange panels are tuned to 71, 71, 97, 110 and 155 Hz, four buttons each.
All these numbers mentioned here are written on the frames of the drivers. With usage these numbers lowers, especially the lowest ones.
I don't remember all the numbers any longer and don't remember where I wrote them down. I am tempted to take the socks off again but I am not sure it is worth the trouble.
I expect the resonance numbers would fall during break in and then slowly drift down. But not from 46/55 to mid 30s. That is a lot of change.
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