Carolus
One STep beyond
Anyway, you can get a pair of DIY ones by building them from a juice or milk tetra brick (I hope have been understood) and you'll get an advantage since you can drill a bigger inner hole and maybe put inside a bigger speaker -5'' or 4.5'' if found instead of 4''- so sound will be very much better*...
(*) Make a test prior for exact measures.
(*) Make a test prior for exact measures.
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