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Yeah I was thinking about this but I got the impression that I should just go for the one with higher xmax and power handling, which in this case is the MX15.
I wouldn’t.
I would counter that shorting rings are not very important for sub bass frequencies as they can't be made thick enough to have effect. Stamped frames also they are associated with cheaper drivers but do they have issues in the sub bass range?
You clearly did not suffer through the era of super long throw overhung-motor drivers with no inductance control. Yes, one can equalize out the nauseating upper-bass hump inherent in these crude air pumps, but even after doing so they are audibly different from modern drivers. Try to pick up one of the ****** bass pumps of that era - Ascendant Audio Avalanche, Elemental Designs, some Stryke/Acoustic Elegance (TC Sounds made) HE15 or similar TC-made Eclipse drivers, etc. - and compare to a driver with some attention paid to inductance control. A comparison that vividly hammered it home to me was a TC Sounds TC2+ (Oaudio brand) 15" driver and a TC Sounds 3HP (I think - Stryke/AE HE15 brand ) driver. TC2+ was their base model, but newer in design and had shorting rings in the motor. HE15 was longer throw but and more expensive but a lesser design. I did the comparison back in the day, equalized for the same nearfield response using a Velodyne SMS-1. It was not close - TC2+ 15 added musical foundation, HE15 added a loud dull thud.