Aliexpress dual rail power supplies for +/-50 volts?

Make your own. There are a lot of fake components used in Chinese audio kits and modules.
two of these capacitors - 10,000 uf 63v (also need a pair of mounting clips)


80-ALS80A103DB063 from Mouser.com


A bridge rectifier: 35a 600v GBPC33506

512-GBPC3506W also from mouser.com


By all means use one of their speaker protection units and hope it works when its needed.
 
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