Behringer Media 40USB 4" Powered Studio Monitors with USB Behringer Media40USB 40W Bi-Amped High Resolution Digital Monitor Speakers - Behringer 3 Year Limited Warranty Configuration: 2-Way Amplification: 40-watt bi-amplification system Connector: Powered Speaker:1x USB2x unbalanced RCA 2x balanced 1/4" TRS 2x balanced 1/8" mini-plug1x 4-pin proprietary connectorSatellite Speaker:1x 4-pin proprietary connector Input Types: 1 x USB, 2 x 1/4", 2 x RCA