The Sonodore pre-amplifier MPB-502 is especially designed for the Sonodore microphone RCM-402. The pre-amplifier is 'unbalanced' to avoid the negative effects (different kinds of distortion) that occur in balanced circuits. This results in a very high sound quality.

Frequency response: 4 Hz to 1MHz (-3dB)

THD+N: 0.0001% at 0dB gain 0.001% at 53dB gain (at +14dBu, 20Hz to 20KHz)

Equivalent input noise: 0.29µV at 53dB gain 1,8µV at 0dB gain (A-weight)

Slew Rate: 20V/µS

Crosstalk: >75dB at 0-10KHz

Maximum output level: 8,5V ,+21dBu

Output impedance: 56 Ohms

Maximum output current: 50mA

Input impedance: 22KOhm unbalanced

DC offset : < ±2mV

Cable drive capability: > 100m

Gain: 0 to 53 dB (0 dB, 15 dB, 30 dB +0 to 23dB in 1dB steps)

Number of channels: 2

Input: 4-pin XLR female connector (unbalanced, transformerless)

Output: 3-pin XLR male connector (balanced, ground compensated)

Power requirements: 105-120V and 210-240V, 50 to 60 Hz

Power consumption max : 20W

Weight: 6,2 kg

Dimensions: 30,5cm × 23,5cm × 7cm (12" x 9.3" x 2.7")

Battery power

Max operating time, full battery: 32 hours

Operating time after 1 hour charging when batteries are empty: 6 hours

Battery fully charged in 20 hours

Operating time after 1 year storrage: about 15 hours

If max operating time is lower than 20 hours: consider replacing batteries

For max life span of batteries: it's wise to stop charging after 1 day