Cleaning, polishing Speaker Cabinets ?

As Bill_K says, there is no one product right for all finishes. Currently, most wood veneer finishes are over coated with a catalyzed clear coat that is not going to allow any product to pass through to the wood underneath. So, waxes or automotive type products are going to work fine for clear coated veneer or lacquer surfaces. Most of the time, those oil based wood care products do no good whatsoever. In the rare event you have an open grain or oil finish over wood veneer, then one of the oil based products will actually work.

Natatmvs. I read up on your speakers and they are finished with a process akin to automobile painting using a catalyzed polyester finish. The last thing in the world you want to use is an oil based wood furniture polish. Clean all the old lemon oil residue off with furniture cleaner and a clean microfiber cloth (don't use any cloth that can scratch the polyester finish.) I've never felt the need to use anything other than Mother's "Showtime" automotive detailing spray on my similarly finished speakers.