PreSonus Eris E66 Near Field Monitor Pair (2) Presonus ERIS E66 145w Active Powered Dual 6.5" MTM Studio Monitors. Dual 4.5-inch/6.5-inch, custom-woven Kevlar LF/midrange drivers produce dynamic, size-defying bass output 1.25-inch, silk-dome HF driver ensures smooth high-frequency performance that is never fatiguing to the ears. Balanced XLR, balanced -inch TRS, and unbalanced RCA inputs provide flexibility for seamless integration into any environment Acoustic tuning controls help to compensate for room anomalies, providing a consistent frequency response customized for your mix environment. Continuously variable HF and MF controls (-6 to +6 dB) Low-cut filter (flat, 80 Hz, 100 Hz). Acoustic Space settings (Flat, -2 dB, -4 dB) compensates for room placement. 90W/140W Class A/B bi-amplification for an open, clear sound RF interference, output-current limiting, over-temperature, and subsonic filter protection. Amplifier soft start feature eliminates popping on power-up. Internal power supply with IEC connector