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.