What to use in polishing high quality wood speaker

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.

When I had original C1's in cherry I used a wood cream. When I got the C1 Sig's I use a good (no swirl) auto wax like Meguires NXT - Turtle wax liquid ice or Mothers quick detailer. Of course use a micro fiber cloth.

Avalon Acoustics encourages their owners to use Stewart McDonald Preservation Polish (stewmac.com). Whatever you use, stay away from silicone based products.

Absolutely what Raks said.

How about renaissance wax. This is what museums use for their priceless collections. Expensive, but a little bit goes a long way. Found at high end woodworking stores like Woodcraft and Rockler to name a couple.