NO!!! That product states that it's for vinyl, rubber, and plastic. I don't own Focal speakers but believe that they're a painted finish, if so you'd be better advised using a finishing product made for fine automotive paint finishes. I'm sure someone more familiar with the specific finish on the Sopra speakers will respond with suggestions of a more appropriate product to use. I've used Gerlitz Smudge Off to clean similar painted high gloss speakers which Ivan has recommended, and it works very well to clean and leave a streak free shine.
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