Sonodore pre-amplifier MPB-502
2 Channel Microphone Pre-Amplifier / Battery Powered / combined 60V Power Supply.
The Sonodore pre-amplifier MPB-502 is especially designed for the Sonodore microphones.
The
pre-amplifier is 'unbalanced' to avoid the negative
effects (different kinds of distortion) that
occur in
balanced circuits. It is built with the latest developments in improved sound quality such as:
Mundorf silver/oil and silver mica capacitors, siltech mono crystal wiring and special metalfilm
resistors. This results in a very high sound quality.
It is a well known and documented fact, that battery powered audio equipment
(separated from the main voltage) sounds substantially better. There are several plausible reasons for
this. Apart from getting rid of the pollution on the main power,
also the absence of interfering ground
currents adds to the improvement also.
What we found in our testing period, which extended over half a year of recording with prototypes, is:
Technical Specifications
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: 0.29uV at 53dB gain, 1.8uV at 0dB gain (A-weight)
Slew Rate: 20V/uS
Crosstalk: >75dB at 0-10KHz
Maximum output level: 8,5V ,+21dBu
Output impedance: 56 Ohms
Input impedance: 22KOhm unbalanced
Gain: 0 to 53 dB (0 dB, 15 dB, 30 dB +0 to 23dB in 1dB steps)
DC offset : < ±2mV
Cable drive capability: > 100m
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: 6,5 kg
Weight special lightweight model: 3,9 kg
Dimensions: 30,5cm × 23,5cm × 7cm (12” x 9.3” x 2.7”)
Manual for charging the batteries: Battery