The Shure RPM89 Microphone Preamplifier is a Class A, discrete shotgun preamplifier that can be used interchangeably with VP89 and SM89 microphone capsules. Lightweight with low self-noise, the RPM89 features rugged aluminum alloy construction.
In addition to its high output level and fast transient response, the RPM89 has no crossover distortion and minimal harmonic and intermodulation distortion.
To control background noise and rumble, the RPM89 has a switchable low-frequency rolloff at 200 Hz.
|Output Impedance||115.0 Ω|
|Signal to Noise Ratio||79.0 dB|
|Low Frequency Roll-Off||
-12 dB/oct below specified frequency:
Normal, flat response: 100 Hz
Low frequency rolloff engaged: 200 Hz
|Operating Temperature Range||0 to 135°F (-18 to 57°C)|
|Storage Temperature||-20 to 165°F (-29 to 74°C)|
|Operating Relative Humidity||0 to 95%|
|Polarity||Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3|
|Housing||Charcoal-grey metallic painted aluminum alloy|
|Power Requirements||11-52 V DC phantom power (IEC-61938), <2.0 mA|
|Dimensions||4.02 x .87" (102 x 22 mm)|