Radio Design Labs RM-MP12A Audio Monitor Panel12 Line or Speaker Input Inputs (12): +4 dBu, 25 V, 70.7 V, 100 V (set by rear-panel switches) Input Level: -11 dBu to +9 dBu (+4 dBu input) 25 V, 70.7 V, 100 V (calibrated with gain trim set fully counter-clockwise) Headroom: 18 dB (above calibrated input level) Gain: 0 dB to 20 dB (Adjustable for speaker-level input, 25-turn trim potentiometer) -5 dB to 15 dB (+4 dBu input) Frequency Response: 10 Hz to 20 kHz (+/-0.25 dB) THD+N: < 0.010% (20 Hz to 20 kHz) Intermodulation Distortion: < 0.025% (20 Hz to 20 kHz) Channel to Channel Crosstalk: < -80dB (10Hz to 20 kHz) Residual Noise: < -80 dB (Channel ON; referred to +4 dBu) OFF Attenuation: 80 dB (10 Hz to 20 kHz) Indicators per Channel (2): Red channel active LED above button; Variable intensity audio level LED for each input (minimum intensity at -15 dB, maximum intensity at 0 dB) CMRR: 75 dB (50 to 120 Hz) Outputs (4): 150 Ohms, +4 dBu fixed level (balanced or unbalanced via plug-in terminal block) 150 Ohms, +4 dBu variable level (balanced, controlled by front-panel volume knob) 4.5 W RMS external speaker connection (use of external speaker disconnects internal speaker) 100 mW ??-inch stereo headphone jack Power Requirement: GROUND-REFERENCED, 24 to 33 Vdc @ 700 mA Dimensions: Height: 1.75", 4.40 cm Depth: 5.35". 13.60 cm Ambient Operating Environment: 00 C to 550 C