SPS-1 Specifications Preamp Modules Input(Piezo or Magnetic): 10 Mohm, unbalanced Input(mini-mic): 15Kohm, unbalanced, +9 Vdc power to mic. Maximum Input Level: +15.5 dBu (4.6 Vrms) Input Noise: EIN less than -113 dBu, input shorted. Frequency Response: +0/-1 dB, 20 - 20,000 Hz Distortion: THD less than 0.01% at 0 dBu Gain: 0 to +20 dB, adjustable Output: Balanced, 3-pin mini-connector Main Preamp Unit Module/Mic Input: 3-pin XLR, balanced Line In: 1/4" phone jack, unbalanced, 10Kohm. Insert: 1/4" stereo jack, tip=send, ring=return. Mic Preamp:  EIN less than -128 dBu, 50dB gain. Frequency Response: +0/-1 dB, 20 - 20,000 Hz Distortion: THD less than 0.007% at 0 dBu Output Noise: EQ out, unity gain: less than - 93 dBu, EQ in, set flat: less than - 88 dBu Maximum Output: +21 dBu, unbalanced, +27 dBu, balanced Channel Outputs: 1/4" phone jack, TRS balanced, 600 ohm. Master Outputs: XLR, balanced, pin 2 in phase, 600 ohm. Monitor Outputs: 1/4" phone jack, unbalanced, 600 ohm. Effects Sends: 1/4" phone jack, unbalanced, 600 ohm. Effect Returns: 1/4" phone jack, unbalanced, 10Kohm. Tuner Output: 1/4" phone jack, unbalanced, 10Kohm. Phones: 1/4" stereo phone jack, 100 ohm. Metering: Signal (green): -20 dBu; Peak(red): +14 dBu Equalizer: Three band fully parametric, ± 15 dB boost/cut Lo: 35 - 880Hz, 0.1 to 1.0 octave (Q=10 to 1) Mid: 180Hz - 4.2kHz, 0.3 to 1.0 oct. (Q=3 to 1) Hi : 0.84 to 19kHz, 0.3 to 1.0 oct. (Q=3 to 1) Phantom Power:  +48 Vdc applied to pins 2 and 3 Foot Switch: 1/4" TRS phone jack, 10 mA current loop. Power: 120 VAC, 10 Watts Dimensions Preamp Module: 1.1" x 2.2" x 1.0", excluding input plug. Main Preamp Unit: 1.75" x 19" x 8" (1 rack space), 6 lbs. Foot Switch: 4.3" x 2.3" x 1.2" Notes: 0 dBu = 0.775 Vrms. All noise measurements are unweighted, 20 - 20,000 Hz bandwidth. All specifications are subject to change without notice.