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In Reply to: RE: Old glue formulation or newer formulation posted by Green Lantern on April 14, 2016 at 05:34:38
The mids of the 20-series will certainly not withstand hundreds of Watts without melting the Mylar. Remember the foli conductor is just 0.0005" x 0.1". They will also compress in its lower range as they cannot move very much air.
Those of you running 1000 W amps with Magnepan speakers. Have you ever measured how many Watts you really feed to the speakers? I would be surprised to see 1000 W in the bass, at least the in low bass where the fundmental resonance take up very much of the limited excursion.
Follow Ups:
Do foil conductors in the 20 series (0.0005" x 0.1") differ from those in the 3 series. If not it doesn't explain the failures in the 20.Xs. Additionally, there are probably fewer 20.s than 3.s in service.
Do the 20.s move less total 'corresponding' air than do 3.7s (or 3.7is) when given the same amount of 'juice', which might then tempt their owners to crank it up?
The 3.7/3.7i has different foil conductors, 0.001"x0.075". These can take more power. I am not sure if the 20-series mid have the thinner Mylar as the Tympani IVa had. Thinner Mylar will melt earlier/quicker. The mids of the 20-series are more "stressed" due to the lower cut-off frequency compared to the Tympani IVa.
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