Pioneer DJ DM-40D-BT-W 4" Desktop Monitor System With Bluetooth (White)The DM series speakers deliver balanced, punchy bass sound and they can pump out extra power thanks to the new Class D amplifier and 4 inch woofer in each unit. Flick the switch to change from DJ mode to Production mode and the DSP settings will automatically create the best sound for each application. KEY FEATURES Advanced design for higher quality sound Class D amplifier Each DM series speaker produces pure, balanced bass sound thanks to a new Class