Pioneer DM-40 The Pioneer DM-40 is a powered pair of 4′′ studio monitors designed to give you exceptional sound for your home studio and DJ set-up. Based from the popular S-DJX series, the monitor pair features a front-loaded bass reflex systems with DECO technology for a punchier sound and wider ‘sweet spot’. Easy to set-up and use with an easily accessible volume control knob on the front, and both RCA and stereo mini jack inputs for connecting to your DJ or production kit. The DM-40 monitors feature a built-in Class A/B amplifier (left speaker) that delivers 2x 21W with amazing audio response and clarity. Perfect for use as reference monitors, or for your home studio / production set-up.