• Dual channel with separate controls for both channels
• AIR BAND with 6 frequency presets (2.5, 5, 10, 15, 20 & 40 kHz)
• 5 additional bands (2500, 650, 160, 40 and 10 Hz)
• High transparency and presence in the upper frequency range
• Separate sub EQ band
• Up to 15 dB boost per band
• Peak and signal LED indicators
• Input control for down-regulating the input signal
• 1U rack form factor
• 2 XLR inputs and outputs
• High headroom and low phase shift

Technical specifications

• Frequency response: -2 dB, 10Hz & 75kHz
• Nominal input impedance (XLR): 48 kOhm, balanced
• Nominal output impedance (XLR): 50 ohms, balanced
• Headroom: +29 dBu at 10 kOhm, +28.5 dBu at 600 ohms
• THD + Noise: < 0.005%

Function

Each channel of the EQ4M has six EQ band sections. They are divided into four fixed-frequency bell-shaped equalizer sections, a 2.5 kHz shelving equalizer section, and the air-band equalizer with selections of 2.5, 5, 10, 15, 20, and 40 kHz. The five frequency bands in the main section are: Sub or 10 Hz, 40 Hz, 160 Hz, 650 Hz and the 2.5 kHz shelving EQ.

All EQ sections have a boost/cut range of +15 dB and -4.5 dB with a centre position at 0 dB. The air-band section has its own bypass button, and there are separate hardwire bypass switches for each channel. Each channel also has an input attenuator with a range of 0 to -10 dB and a green LED for the signal present (-20 dBu) and a red LED that flashes at peak levels of +23 dBu.