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RE: Quick-fix: will the IIIa ribbon with fit the 3.7?

Posted by Satie on January 10, 2017 at 09:54:03:
The Adyton amp Beluga uses on the tweeter and mids is not going to have a problem with the low impedance of a 3a tweeter. It might be useful to check how hot it is running, but I doubt it is a problem.

I am going to venture a guess as to the cause of the tweeter failure. I would guess that it is related to the adoption of high rez DSD and 24/96 and 24/192 files. These are commonly mastered with 6db higher levels of deep bass and the transients are recorded more fully so that the average mid content level is going to be 5-10db lower, resulting in the listener raising the volume setting.

This has two results, 1. there is more bass content that can leak into the tweeter despite the 2nd order XO. 2. the transient content becomes far more powerful with a transient crest factor up to 10 db greater than on CD.. This increases the burden on the tweeter. People playing vinyl on idlers and high torque DD turntables already face this issue.

The solution is to watch your listening level with a fast response peak SPL measurement with a hold function. If you are getting peaks on high rez content (drum and rim shots, brass) at 110 db then you should tamp down the volume. The second solution is to raise the crossover HP for the tweeter up to above 4 khz.

The old 2 ohm 3A/ T IV tweeter can be used and it is more resilient - perhaps a better choice for you. It is a 55" tweeter whereas the 3.7 has a 60" tweeter inherited from the 20.x models.
Your HP cap for the tweeter is likely going to need a change in order to retain the same -3db point with the lower impedance tweeter. Measure and fix the cap value accordingly.