Not content with having its CDJs in the booth in pretty much every club in the world, Pioneer has been on a mission to fill the world's best venues with its Pro Audio system since it launched in 2013.

I have a chance to pick up a pair of fairly new Pioneer CS-405 speakers for $50, or an older pair of Pioneer HPM-40 speakers for $40.The CS-405s appear to have a 15" woofer, whereas the HPM-40s ...