Best practices for speaker cabinet care

Use caution on speaker finishes.   Most are fine with just a microfiber cloth.   Many modern finishes are water soluble and can be damaged with products made for unfinished or oiled wood.   

Sonus Faber is a good example.  Some are lacquer finished,  some are solid wood.   

Klipsch uses a very thin satin finish on Forte , Cornwall, Heresy and it's easily damaged.   

Black Ash veneer is almost always painted , not stained.     

I had CDM1nt and it was a cherry veneer that had a clear coat finish.     I always just dusted them with a  micro fiber cloth. 

I spray Endust on a micro cloth & wipe down my cherry finish, 804s & LaScala ll. No harm here.

The only type of wood finishes that need any "conditioners" are wax or oil finishes. Anything other type of finish, the wood is completely sealed and anything applied to the finish just sits on it never penetrating the finish. If the veneer finish gets a film on it from cooking, smoke, or other air pollutants, a furniture cleaning solution is what you need, not a wax. For painted finishes, something like Meguiar's Instant Detailer works well to clean and shine without leaving a film buildup. Just make sure there's no dust on it to cause micro scratches before using. 

While we are at it, what is the best way to care for the black lacquer finishes without creating micro-scratches?