Whirlwind LMPRE Single Channel Microphone Preamplifier

The Whirlwind LMPRE is a convenient single channel microphone preamplifier with tone controls and a built in peak limiter. Use it anywhere mic level to line level conversion is required. Common applications include adding a microphone to consumer audio receivers, feeding line level inputs of any professional audio processor or directly into a power amp, distribution amplifier or powered speaker system.

Key Features

• Two place tone controls to enhance the intelligibility of voice applications
• Phantom power (24VDC) supplied for condenser microphones
• Peak limiter protects audio systems from signal overload and distortion
• Level metering and Limit Threshold LEDS
• Balanced male XLR and dual mono RCA output connections

Technical Specifications

Freq. Response at 50 dB gain (Not limiting): ± 1 dBv 20-10 kHz; -2.5 dB at 20 kHz
Freq. Response at 40 dB gain (Limiting): ± 1 dBv 20-20 kHz
THD + N at 50 dB gain (Not limiting): ± .1% 20-20 kHz
THD + noise at 40 dB gain (Limiting): ± .1% 100-20 kHz; ± 1.5% 20 - 50 Hz
THD + noise in limiting: At Threshold < 0.05%;In Limiting <0.11%
Equivalent Input Noise: -115 dBV
Total Gain: 70 dB; 83 dB w/ Bass and Treble at Max.
Gain of Microphone Preamp: 10 to 49 dB
Gain of Master Volume: +/- 15 dB
Range of level pot: Input Gain: 38.6 dB; Output Level 29.8 dB
Common Mode Rejection of Input: 80 dB at 60 Hz
Maximum Input level: +4 dBV
Input Impedance: 20 kOhm differential
Maximum output level: +23 dBV
Output Impedance: XLR 95 Ohms; RCA 1.6 kOhm
Noise at unity gain: -104 dBV
Phantom Power: Yes, 23.7 VDC
Power consumption: Typically 62 mA @ 24 VDC
Power requirements: 24V 200 mA, unregulated; 2.1mm-center positive
Internal Mains fuse: Automatic reset internal fuse; 100 mA