Setting the room response calibration controls
Genelec monitors are calibrated flat in anechoic free field conditions. When the monitor is placed in a room close to walls or other boundaries, the low frequency output of the monitor increases.
To achieve a flat low frequency response an adjustment of typically -4 dB on the bass tilt control is used. Genelec also provides a bass roll-off control to compensate for any remaining excessive LF energy around the low cut-off frequency.
Genelec GLM AutoCal can implement a more precise compensation after measuring the acoustic effects produced by the monitor’s installation location. Differences in room reverberation time and listening distance can lead to changes being required in the treble region so treble tilt is fitted to most of the models in the Genelec range.
In three-way monitors and large main systems there are additional driver controls for the bass level,mid level and treble level which enable very fine adjustment of the frequency response so that the monitors can be placed in many different listening environments, whilst still achieving a consistent and neutral sound reproduction.
The best way to set the room response controls of a Genelec monitor is by taking an acoustical measurement at the listening location, using a measurement system for those products that offer local controls (DIP switches) on the monitor or subwoofer, or by using GLM AutoCal for the SAM™ (Smart Active Monitoring) products.