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RE: Any Tympani-IV / T-IVa owners? Working on mine, and mods

Below pictures showing the mids of T-IV and T-IVa. So your does not have the diaphragm divided into several sections? For the highest performance, it is important that the Mylar stays fixed to the doublesided foam tape. The moving mass of each section is very low as long as the Mylar is attached to the foam tape. If lose, the whole diaphragm act as a large one upsetting the transition to the ribbon tweeter.

Crossovers may be out of phase, depending on the acoustic slopes (no point in looking only at electric slopes). In the end it is the frequency response that counts. If it is flat through the crossover region, then it is fine.

Edits: 11/20/23

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