EQ TWO follows the topology of the four band parametric equaliser that Graham first used in the Amek M3000 mixing console in 1979. This was later adapted for use in M1000 and M2500 consoles and formed the basis of the equaliser design in many other Amek and Total Audio Concepts consoles.

The topology differs from many other state variable filter designs in that each band is composed of a 6dB/octave high pass and a 6dB/octave low pass filter with different turnover frequencies. This enables the bandwidth to be varied over a wide range and also facilitates the Bell/Shelf switching on the High and Low frequency ranges.

Default Q is 0.5 on HF and LF bands. However, these can be increased for sharper response by changing two resistor values for personal taste.

The frequency dividing range switch shifts the HMF range one octave lower to 160Hz to 5kHz, giving more control over instrument frequencies.

A single LED provides indication of signal level. This has quasi-PPM ballistics and illuminates green for signal present (-18dBu), yellow for signals above +4dBu and red for signals above +18dBu.

Typical specifications:

• High frequency: 680Hz to 20kHz, +/-15dB, Q: 0.5 plus shelf mode.

• High mid frequency:320Hz to 10kHz, +/-15dB, Q: 0.5 to 3.2.

• Low mid frequency:100Hz to 3kHz, +/-15dB, Q: 0.5 to 3.2.

• Low frequency:32Hz to 1kHz, +/-15dB, Q: 0.5 plus shelf mode.

• Frequency response (EQ out): +/- 0.5dB, 20Hz-80kHz.

• Phase response (EQ out):+/-20 degrees, 20Hz-80kHz.

• Maximum input and output (100k load):+27dBu.

• Internal operating level/headroom:-6dBu/+27dBu.

• THD&N (EQ in or out, +10dBu input signal):better than 0.05%, 20Hz-80kHz.

• Noise (no EQ in), 22Hz-22kHz, RMS, 40 ohm source:-98dBu.

• Noise (typical EQ setup), 22Hz-22kHz, RMS, 40 ohm source:-89dBu.

• Input/output impedance:20k ohms/75 ohms

ALL SPECIFICATIONS ARE SUBJECT TO CHANGE