PreSonus Eris E.45 HD 2-Way 4.5" Nearfield Monitors, 70Hz-20kHz Frequency Response, 10kOhm Input Impedance, 2x Balanced 1/4" TRS, 2x Unbalanced RCA, Pair This bundle includes: 1 x PreSonus Eris E4.5 Hi-Definition 2-Way 4.5' Nearfield Monitors (Pair) Acoustic Tuning Adjustment Controls 1" Silk Dome Tweeter for Treble 4.5" Kevlar Woofer Cone for Bass 25W Class AB Amplification