Four Channel Microphone Preamplifier

Authentic Transparency for Unrestricted Creativity

Unsurpassed ambience retrieval
Transformerless design with matched hi-speed discrete transistor octet has +23 dBu input headroom: no attenuator “pads” needed
Uncolored timbral accuracy at all dynamic levels
Entirely balanced audio path with precision components maintains signal integrity: THD under 5 ppm (.0005%)
Effortless, vividly realistic musical performance
Laser-trimmed FET-based output stage has 32 dBu headroom: drives 1000 foot (300 m) cable runs with ease
Standard 36-step gain controls (1.5 dB per step) are stereo matched to .08 dB
Ultra-clean universal power supply
Gold switches
Mogami Neglex OFC audio wiring
Silver Teflon power wiring
Welded 16 gauge steel rack chassis

Specifications

Minimum Gain: 8.5 dB
Maximum Gain (1.5 dB per step, 36 steps): 65 dB (up to 75 dB on request)
Frequency Response (+0 / -3 dB): sub 3 Hz to beyond 300 kHz
Noise (60 dB Gain, 10 Hz - 30 kHz, Inputs common): -133 dB EIN
Total Harmonic Distortion + Noise (35 dB Gain, 10 Hz - 20 kHz bandwidth, +27 dBu Out): < .001%, Typ. < .0005% (< 5 ppm)
Intermodulation Distortion (50 Hz & 7 kHz) 35 dB Gain, +27 dBu Out: < .0009%
Phase Response (35 dB Gain, 50 Hz - 20 kHz bandwidth, +27 dBu Out): < 2 degrees deviation
Common Mode Rejection Ratio (35 dB Gain, 10 Hz - 20 kHz bandwidth, 100 mV C.M.): > 65 dB, Typ > 85 dB
Slew Rate (35 dB Gain, +27 dBu Out): > 25 Volts per microsecond
Maximum Input Level (20 Hz - 40 kHz): +23 dBu (no attenuator pads required)
Maximum Output Level (20 Hz - 40 kHz): +32 dBu
Phantom Input Impedance (1 kHz): 6,750 ohms
Output Impedance: 24.3 Ohms (x2)
DPA (B&K) Mic Powering: +130 V dc max, (non-phantom)
Phantom Powering: +48 V dc, +/- 4 V dc
Power Consumption: 45 watts maximum
Power Requirements: 100V to 240V, 50/60 Hz
Dimensions/Shipping Weight: 19” W x 3.5” H x 12.5” D, 21 lbs.