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The flat wind coils in the SSD do allow for more thermal power handling than the round wire. They do use a larger awg wire, 8 layers instead of 4, slightly larger OD... but in the case of the SSD, are 0.100" shorter reducing Xmax by a little over 1mm. But, for those that normally would need these, you would be using the subs in ported enclosures, in or around tuning (for SPL apps) and the minute loss in Xmax is far outweighed by the power handling and other increases. Only recommend it for daily users if they are running a dual purpose system (daily use with different power for occasional SPL comp).
As for MTs needing excessive recones, I have never been aware that it was an issue. We have had plenty of SPL competitors using obscene amounts of power with the same set of soft parts all season. Seems they have things dialed in. Others break stuff all the time no matter what they put in their system. I have noticed that once we do send out a recone to a competitor that they buy them more often... Im assuming that it could be to improper installation, or that they simply push the envelope harder now that they know how easy it is to repair things.
Not doing too much different on the BTLs. But we do have several options that reduce failires as well as a few new construction techniques that keep everything together. The pole chamfer does reduce pressure under the dustcap... at the same time forcing cooling air over the coil for increased power handling. Same goes for the full coolin option, but even more so. Lead wire failure should be a thing of the past with the BTLs as well. Coils will pop long before you run into burnt leadwires.
Our SSD and Q drivers use the older larger MT leadwires, while the BTL uses something MUCH larger than that.