Altec Model 1650 Active Equaliser

A classic piece of Altec engineering, the Model 1650 is an Acousta-Voicing filter set designed to shape and correct the frequency response of a sound system with precision. Built for professional installations, it offers detailed control over problem frequencies, making it equally at home in studio, live sound, or vintage hi-fi setups.

At its core, the 1650 features multiple band-rejection filters with continuously variable sliders, allowing you to tame peaks, lift valleys, and refine the overall house curve of a system. The controls are detented for repeatability, making it easy to recall settings across different rooms or applications – a thoughtful touch that reflects its original use in calibrated environments.

Unlike many passive EQs of the era, the 1650 is an active design with internal gain compensation, ensuring that your output level remains consistent even after significant tonal shaping. Once your curve is dialled in, the gain s