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C - Audio EQ 312 Dual 31 band Equaliser



C-Audio EQ 312 

C - Audio RA 3001 


Optimised for low noise and distortion

ISO frequency centres

Balanced inputs and outputs on XLR and 1/4" jacks

24dB sub-sonic filter

5Hz-200Hz variable high pass filter

EQ bypass

User-definable Peak indicator (-10dB to +22d) 

Band gain makeup control

Ground lift switching


The EQ312 provide 31 ISO centred filters per channel.A fader range switch is provided to allow selection of either 6dB or 12dB of band cut or boost about unity gain.


C - Audio EQ 312 

Technical Specifications

Input Impedance

10kOhm, electronically balanced
XLR and 1/4" jack



Output Impedance

200 Ohm, electronically balanced
XLR and 1/4" jack

Max Output Level


Frequency Response

20Hz-20kHz, +0/-0.5dB


0.01% @1kHz, +4dBu

Noise (unweighted)


Peak Indicator

Variable from -10dBu to +22dBu


-infinity to +6dB

Filters - max boost/cut

Selectable +/-6dB, +/-12dB

High Pass Filter

5Hz-200Hz, 24dB /octave


Shipping 5Kg (11lbs)


483mm x 220mm x 88mm (2U)
19" x 8.7" x 3.5" (2U)


IEC connector, 220/240V ac +/-20% 50Hz

Architect's and Engineer's Specifications


The active equaliser shall be a 1 (or 2) channel rack-mountable unit with 15 (or 31) 'high definition' filters per channel placed on ISO centres. 


Equaliser settings shall be graphically displayed by the position of each filter's centre-detented high-resolution control fader. A fader range switch shall be provided to allow selection of either 6dB or 12dB of band gain or attenuation relative to unity gain.


Inputs and outputs shall be via XLR and 1/4" jack connectors and shall be electronically balanced.


The equaliser shall have a unity gain frequency response of +0/-0.5dB from 20Hz to 20kHz, distortion of no more than 0.01% @ +4dBu, and hum and noise of at least -100dBu unweighted.


The equaliser shall be capable of delivering +22dBu (12V rms) into a 600 Ohm load. Equalisation and operational functions shall include 30-step detented rotary controls for: trimming output gain between -infinity and +6dB, a user-definable peak indication threshold control ranging from -10dB to +22dB, and a 24dB per octave high pass filter with corner frequency continuously variable between 5Hz and 200Hz.


The equaliser shall incorporate a facility to bypass the graphic filter section but not the high pass filter. A rear-mounted panel switch shall be provided to safely isolate signal grounds from AC and chassis grounds.


The equaliser shall be capable of operation from a 220/240V 50Hz AC power source, and shall be 2 rack units (3.5") high. A perspex front panel security cover shall be available.


The published specifications shall be met or exceeded.


The equaliser shall be a model EQ 152/311/312 manufactured by C Audio, Herts, England.


Trade Descriptions Act: C-Audio have a policy of continual product improvement and accordingly reserve the right to change features and specifications without prior notice.



















The C-Audio RA Series is comprised of three

High performance stereo power amplifiers.

The models are:


RA 1001:  250W/4 ohms x 2

RA 2001:  450W/4 ohms x 2

RA 3001:  625W/4 ohms x 2


The RA Series has been developed to provide optimum long-term performance, operational reliability and sonic quality from a tough and compact amplifier package just 2U high. The Power Rating Table (see below) details the continuous average output power of each model into a variety of loads.


Power Rating Table

Continuous Average Power

Both Channels Driven



4 Ω

8 Ω

16 Ω

8 Ω

RA 1001





RA 2001





RA 3001






Output power values are in Watts @ 1kHz and

@ 1% distortion.


RA 1001

RA 2001

RA 3001







Rugged steel chassis and a high standard of internal construction ensure long term reliability in “real-world” operation.

Compact 2U (3.5”) height and very efficient forced cooling make for economical and safe of high-density multiples.

Overall sonic quality and satiability into

long cable runs and difficult loads

enhanced by audiophile grade circuit


High CMRR electronically balanced inputs to both XLR and 0.25” jack

Connectors, output on Neutrik Speakon Connectors.

Product reliability and service life extended through optimum power supply design  and improved output stage efficiency.

In-built protection of amplifier and speaker loads against faults and misuse

Ground lift switch fitted to help eliminate system hum loops.

Large-scale use of  common assemblies and components  simplifies servicing and minimises spare parts inventories.


















RA Series design is the result of many years of development and applications expertise been merged with the extensive CAD/CAM resources of the advanced technical and operational features built in to these products (see panel) have been well proven and have been incorporated to satisfy known user requirements.


In particular the benefits of reliability, consistent stability into “difficult” loads and the protection of the amplifier and loudspeakers from faults and misuse have been  assured through innovative circuit design and the use of high-grade, close tolerance components. Comprehensive control, indication and termination facilities are fitted as standard to every amplifier.


It is these features. together with the three models high level of commonality and their carefully graded power  output ratings that have made RA Series amplifiers the choice of audio engineering  professionals worldwide.


RA Series products are specified and constructed to be fully performance compatible with all other  industry standard and pro-audio equipment.



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