Features 3.5-inch (89 mm) woven composite low-frequency transducer 1-inch (25 mm), ultra-low-mass, silk-dome, high-frequency transducer Rear-firing acoustic port for superior bass-frequency reproduction Optimized, resonance-suppressing internal bracing High- and low-frequency tuning controls Front-panel Volume control for speakers and headphone amplifier 50 watt (25W/side), Class AB biamplification RF interference, output current limiting, over-temperature, transient, and subsonic protection Amplifier “soft start” feature eliminates popping on power-up Internal power supply with IEC connector Power switch with on/off LED Balanced ¼-inch TRS, unbalanced 1/8-inch stereo, and RCA inputs Integrated stereo headphone amplifier with front-panel 1/8-inch output Specifications Inputs 1- Stereo 1/8 2- Balanced ¼” TRS 2- Unbalanced RCA Performance Frequency Response 80 Hz - 20 kHz Crossover Frequency 2.8 kHz Amplifier Power 25W/speaker LF Driver 3.5 HF Driver 1” silk dome Peak SPL (@ 1 meter) 100 dB Input Impedance 10 kO User Controls Volume Range A-type taper MF Control Variable (-6 to +6 dB, center 100 Hz) HF Control Variable (-6 to +6 dB, center 10 kHz) Protection RF interference Output-current limiting Over-temperature Turn-on/off transient Subsonic filter External mains fuse Power 100-120V ~50/60 Hz or 220-240V ~50/60 Hz Cabinet Vinyl-laminated, medium-density fiberboard Physical Width 5.6 (141 mm) Depth 6.4 (162 mm) Height 8.3 (210 mm) Weight (per pair) 6.4 lb. (2.9 kg) WATCH: PreSonus Eris E3.5 Active Media Reference Monitors