What brand is this?

[Silven_k]

My friend recently started getting into car audio, so he decided to get a secondhand subwoofer for cheap to figure out how to route everything etc. Now i’m curious what brand this is since neither of us can figure it out

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[ciaonzo 5,000+ posts]

I'm not certain but I'm going to suggest that it's an old school Concept sub? It doesn't look like the usual logo but maybe it's an early example. Or what about Treo? Have any motor shots?