Boredbrain Music EQx5

MUSICAL FEATURES

The Boredbrain Music EQx5 is an effective 5-band stereo equalizer for Eurorack synthesizers.This unit, which can quickly and musically adjust the frequency component of an audio signal, implements CV control for all parameters for experimental equalizing processing.

• Five frequency bands with ± 12 dB gain width
• Post EQ balance and level control
• Equipped with CV input for all parameters
• Stereo input / output with separate signal paths
• Equipped with Mono Sum output

HOW TO USE

Five Frequency Bands

This unit is equipped with a 12-band graphic EQ, each capable of a level boost / cut of ± 5 dB.The primary filter used in the equalizer has a slope of 1 dB / Oct from each center frequency.

• HIGH ―― 10kHz shelf
• HI-MID ―― 4kHz peak
• MID ―― 1kHz peak
• LO-MID --400HZ peak
• LOW --100Hz shelf

Adjusting these bands applies subtle or dramatic changes to the frequency response of the source audio signal.These adjustments can be used in a variety of situations, such as attenuating problematic frequencies to emphasize others, or creating deliberate space in a mix to create a particular sound.

Balance & Level

The Balance parameter is essentially an equal-power crossfader that simultaneously affects the gain of both the left and right channels, as well as their opposite ends. When a stereo signal is patched to the module's input, this parameter functions as a panning control, shifting the stereo image left or right. When two mono signals are patched to the module's input and the OUT L+R mono output is used, this parameter functions like a volume crossfader, without any noticeable level drop at the center point. The LEVEL parameter is a post-EQ volume adjustment, primarily used to compensate for level changes after frequency equalization. EQx5 implements a pseudo-loudness function; as the LEVEL is lowered, the LOW and HIGH shelving filters are gradually boosted. This allows the richness of the signal to be maintained even when the signal attenuates, resulting in an equal-loudness curve.

Complete Voltage Control

An important feature of EQx5 is that it implements CV inputs for all parameters, offering a wide range of experimental possibilities in a Eurorack environment.The amount of boost / cut applied in each band can also be modulated using a 10Vpp CV signal, in which case the gain knob in the frequency band acts as an attenuator.In addition, both the Balance and Level controls also have their own CV inputs (± 5V). The Level parameter works more or less like a VCA when used in combination with a CV.

Input & Output

The two inputs, L and R , are designed for audio signals within the audible range. These inputs are AC-coupled and block DC signals to suppress noise. Input R is normalized to L, so if no patch is present, a copy of L is input. In addition to the two separate L and R outputs, the module features an OUT L+R mono output that provides the sum of the two channels. As mentioned earlier, this output is useful for crossfading between two signals using the Balance parameter, or for easily mixing two audio signals.

DEMO