Single jensen speaker ... what to do

I picked up someones junk last weekend and got a jensen spx-9 speaker (single).
What does one do with one speaker ... make a project out of it perhap? It has 4x5 inch speakers and sounds pretty tight.

I was considering making a pair of small passive subs, but dont really have the kit here to do it.

Or is there a market for 1 speaker .. perhaps people with only one ear?

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