Thiel used to only recommend Endust.
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More important than the wood product is the technique and tools. Use only 100% cotton towels or microfiber cloths and rub gently in straight lines to avoid scratching. No paper towels. As to product, probably any decent wood spray will work, depending on the finish. If it's a high-gloss poly finish, you're not even touching the wood itself, only the poly.
This overview on finish care from the Piano Technician's Guild on piano care is equally applicable to a fine finish on your speakers.