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In Reply to: RE: Quick-fix: will the IIIa ribbon with fit the 3.7? posted by Roger Gustavsson on January 10, 2017 at 11:42:11
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.
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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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