With regards to Neo speakers, I've had good luck with the Eminence Tonkerlite. As far as technology goes, the signal does not pass through the magnet, so what's the problem? I also have a 4x12 cab loaded with Jensen Mod 12-35 speakers that have really small ceramic magnets, no problems.
Maybe it's like all Celestion speakers: When they say 25 or 60 or 80 watts, that's *exactly* what they mean! Celestions sound great, but are not (IMHO) forgiving when overpowered...
Or, the Chinese Celestions aren't up to snuff...
OR, some new mass produced items, regardless of brand can fail...
*OR,* I haven't a clue
go figure
ty