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In Reply to: RE: Quick-fix: will the IIIa ribbon with fit the 3.7? posted by Satie on January 10, 2017 at 09:54:03
neolitb wrote:
"The IIIa ribbon is wider than the newer models (everything after the IIIa) and may not fit the cage.
However I think you could easily swap in the IIIa tweeter (cage and ribbon) into the 3.7 since the width of the cages are the same. The IIIa cage is 0.6" shorter than the 3.7 so it will fit in the "groove"."
The cages that I have, have the same measurements, not sure about the screw holes. Mine are Tympani IVa and 3.6. Both cages are 60 inches long, 1524 mm. Width are also the same.
Follow Ups:
The 60" v 60.6" length info came from Magnepan and I did have to rout out the tweeter channel so the 3.7 ribbon would fit in my IIIa's.
I married the perfect woman. The downside is everything that goes wrong is my fault.
The manuals up to the 3.6 indicate a 55" ribbon, I don't know at which point in the course of the 3.6 model's life they started using the 60" ribbons. It has been quite a while that when they get both speakers of a 3A or 3.3 and 3.5 for restoration they swap the origina short tweeters for the long one, at least if asked to.
How about we all measure the length of our ribbons and note the model?
55" is what Magnepan say in the manual of the Tympani IVa, that is for the length of the ribbon - not the cage which is 60". My T-IVa are from 1986 and my 3.6 from 2003. Both have 60" cages!Cross sectional view:
Edits: 01/11/17
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