Presonus Eris E8 Pair - Two High-Definition 2-way 8 inch Near Field Studio Monitors 5.25-inch (E5) / 8-inch (E8) Kevlar low-frequency transducer 1-inch (25 mm), ultra-low-mass, silk-dome, high-frequency transducer 70 (E5) /130 watt (E8), Class AB biamplification Front-firing acoustic port for superior bass-frequency reproduction Midrange (6 dB, continuously variable), HF (6 dB, continuously variable), High-Pass (Off, 80 Hz, 100 Hz) and Acoustic Space settings (flat, -2, -4 dB) for accurate mixing contour