Speaker Polish?

I'm sorry, but I don't know about any speakers or speaker maintenance products made in Poland. I understand that it is pretty wet over there, so I'd be more concerned about rot than drying out! I'm understand that the Kuzma TTs and Audes speakers come from former Easter bloc contries though;)

I would contact the manufacturer and see what they recommend. Finding out about something like this the hard way may be something you want to avoid.

Having said that, i typically use lemon oil to clean and polish most of the speaker cabinets that i have. This can ( and does ) darken the finish on older cabinets, bringing back the lustre and richness that they once had. You are smart in wanting to take care of this situation prior to them actually needing maintenance though. Sean]
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I always used Boiled Linseed oil on hand rubbed oil finished wood loudspeakers. If the wood has a poly or protective finish,you'll have to treat that differently.