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T-IVa ribbons

Well, the original ribbon that I have is 3 Ohm without any resistor. Was the T-IVa released before the MG-IIIa? I also have the replacement ribbon, the 2 Ohm, as this is the only spare Magnepan have for these.

The external crossovers are not identical for MG-III/IIIa and the Tympani IVa. The T-IVa is crossed over lower.

Edits: 01/20/21

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