Graphic equalisers are found in just about every sound application, from room contouring to feedback control and general audio sweetening.
These filters are very musical gentle boost and cut shelving filters which can be used to add (or remove) room effects that change with temperature, audience numbers or humidity.
All these effects can be easily made without disturbing the critical fader settings already made.
Constant Q Filters
The modern generation of graphic eq's uses the Constant Q topology, pioneered by BSS Audio, which means that the filter width is constant whatever the fader gain setting.
Compared to the earlier 'gyrator' style of filters, Constant Q filters provide a smoother and more predictable interaction between adjacent faders and the resulting eq curve more closely resembles the actual fader positions.
More Gain Control Per Filter
Each eq fader has +/-15dB of adjustable gain, more than many competitive graphic eq's. The faders are long-throw 45mm types for precision control.
When any eq fader is in its centre detent position, the filter is automatically bypassed, for optimum performance.
The EQ IN buttons switch the EQ path
into circuit. When switched out, or power fails, a high-quality relay switches the input signal directly to the output connectors.
30 EQ filter faders on ISO centres, each with nominal +/-15dB of gain. Positive centre-detent on 45mm long-throw precision faders.
Sweepable high pass filter, frequency adjustable from OUT (flat) up to 250Hz.
Smooth shelving filter, +/-6dB of gain at 50Hz
Smooth shelving filter, +/-6dB of gain at 14kHz.
Used for overall unity gain adjustment. Adjustable from - infinity to +10dB.
Triple-point clip detector that indicates red when the internal signal is clipping at any one of three critical points.
Shows output signal level (input signal when eq is bypassed) from -24dBu to +18dBu in 8 steps.