Corus Preamplifier Features and Specifications

Precision machined from a single block of non-resonant aircraft-grade aluminum, the Corus Preamplifier’s main chassis houses all audio and control circuits, entirely isolating the power supply in its own external machined aluminum housing.

The Corus Preamplifier features fully isolated transformer-coupled inputs/outputs combined with military-grade 4-layer ceramic circuit boards, delivering a sensuous grain free musicality with astonishing transparency and low level resolution.


Machined Aluminum Chassis
Preamplifier circuitry housed inside a single ultra-low resonance, structurally rigid chassis, precision-machined from a solid block of aircraft grade 6061-T6 aluminum, completely sealed for maximum electrical/EMI/RFI isolation.

Functional Isolation
Power supply is confined inside an external machined aluminum chassis. Sensitive audio circuits isolated from power supply in main preamplifier chassis. Left and right channel circuits are further isolated into individual milled aluminum pockets in a true dual mono design for ultimate EMI/RMI shielding.

Ceramic Circuit Boards
All audio circuits are implemented on military-grade, multi-layer, low dielectric constant, Rogers™ ultra-rigid ceramic circuit board substrate for extremely low energy retention and absorption. Large low impedance ground plane areas for extended internal star-grounding.
Ceramic Capacitors
Newly developed ceramic capacitors replace conventional electrolytics, resulting in power supply noise decoupling improvements by an order of magnitude (10X), especially at higher frequencies.

Dual Zone Pre-amplification
Separate 2nd gain stage for record outputs offers same circuitry as the primary signal path with independent volume control.

All inputs and outputs routed through professional grade Lundahl transformers for maximum common noise rejection, EMI immunity, and cross-component compatibility. Transformer coupling to all circuits ensures identical gain for both balanced and unbalanced inputs and outputs.
Flexible Connectivity
6 inputs (4 XLR balanced, 2 RCA unbalanced); 4 main outputs (2 XLR balanced, 2 RCA unbalanced); 2 record outputs (1 XLR balanced, 1 RCA unbalanced); per channel.

Output Offset
High-resolution programmable gain offset on main unbalanced output 2 with 0.5dB resolution adjustable relative to main output 1.

Unity Gain Inputs
Any main input can be configured as a unity gain bypass for compatibility with theater processors.

Channel Balance
High-resolution (1.0dB) panning of stereophonic image (channel balance) for a maximum +/-20dB shift.

Long life 32x320 pixel custom graphic vacuum fluorescent display (VFD) offers maximum resolution of display data for status indication.

Handheld Remote
Highly ergonomic, custom handheld remote transmitter milled from aluminum billet supports complete system control and duplicates front panel operations.

Remote sensor
Wired remote sensor milled from aluminum billet enables handheld remote transmitter operation while housing preamplifier in closed cabinet enclosures.

Quiet power-up
No turn-on or turn-off transients during intermittent power interruptions.


Overall Gain   
Maximum 7 dB , +/- 20 dB programmable on each input

Gain Range
99.5 dB, 199 Equal Increments

Gain Resolution
0.5 dB, +/- 0.03 dB Over Entire Range

Frequency Response
10 Hz – 300 kHz, -3 dB @ 8 ohms

Maximum Input Level
13.5 volts (RMS) @ 0 dB Gain

Maximum Output Level
13.5 volts (RMS)

THD + Noise
< .003% @ 2 volt (RMS) Output, 50 Hz – 20 kHz

Signal-to-Noise Ratio
> 100 dB

Common Mode Rejection Ratio
> 90 dB, 20 Hz – 20 kHz

Channel Separation
> 93 dB, 20 Hz – 20 kHz

Input Impedance
40k ohms Balanced or Unbalanced

Output Impedance
60 ohms Balanced or Unbalanced

4 pair Balanced (XLR), 2 pair Unbalanced (RCA)

2 pair Balanced (XLR), 2 pair Unbalanced (RCA) for Main

Power Consumption
15 watts

Power Supply
Universal Voltage Input Power Factor Corrected Power Supply

320 x 32 dot Vacuum Fluorescent Display (VFD)

Preamplifier Weight
22 lbs. / 10 kg

Power Supply Weight
6 lbs / 2.7 kg

Preamplifier Dimensions (h/w/d)   
3.9” x 15.5” x 12.3” (99mm x 394mm x 312mm)

Power Supply Dimensions
(h/w/d)    2.9” x 4.7” x 11” (73mm x 119mm x 279mm)

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Last Updated
25th of September, 2013

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