The Adjustable-Snare Bass Cajon
It may look like a funky speaker cabinet and have a name that is similar to a Spanish word for something else, but a cajon (Spanish for crate) is actually an  instrument. Far from its apparent origins as a makeshift break-time instrument among dock workers at South American ports (hence the crate), contemporary models have become more refined and can frequently be seen in small ensembles–especially flamenco.

The backside of the closed wooden box usually has a resonating hole like a guitar, while the front side  is made of a very thin plywood which acts as the drum head. The drummer plays it as he sits on it. Pretty cool arrangement.

I made these cajones a bit bigger than most for a deeper bass  sound. The one with the  silver knob features a sliding carriage (pictured below) which allows the drummer to quickly convert the  bass cajon into a "snare cajon". By depressing  the  knob the interior   snare ribbon comes away from the damper and snugs up to the head. With a quick pull it retracts, returning  the cajon to a pure bass sound.