I don’t think anybody would seriously bother. Cables make little to no difference as anyone can verify themselves easily - provided they have good equipment. If you have big differences then get better matching equipment, repair it or get rid of it.
Nobody who sells high end cables does double blind because it would show that special high $ cables dont work (unless they have a filter) and ordinary cables are just perfect as good audio systems are designed that way - so there is no interest to prove that cable products are just snake oil and hence none of the sellers or manufactures offer any form of proof.
Obviously if a manufacturer could prove their high end cable to be audibly superior to others then you can bet one or more of the hundreds of manufacturers would be offering demonstrations - quickest way to make millions of $ so it is not like there is no incentive to prove the superiority of a product.
Nobody who sells high end cables does double blind because it would show that special high $ cables dont work (unless they have a filter) and ordinary cables are just perfect as good audio systems are designed that way - so there is no interest to prove that cable products are just snake oil and hence none of the sellers or manufactures offer any form of proof.
Obviously if a manufacturer could prove their high end cable to be audibly superior to others then you can bet one or more of the hundreds of manufacturers would be offering demonstrations - quickest way to make millions of $ so it is not like there is no incentive to prove the superiority of a product.