זוג מוניטורים אולפניים מוגברים PreSonus Eris E3.5   Components and construction   3.5-inch (89 mm) Kevlar® 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   User controls   High- and low-frequency tuning controls Front-panel Volume control for speakers and headphone amplifier   Power and safety   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   Inputs and outputs   Balanced ¼-inch TRS, unbalanced 1/8-inch stereo, and RCA inputs Integrated stereo headphone amplifier with front-panel 1/8-inch output