Optional Output Limiters

The TDM 24CX series crossovers can be ordered with output limiters. These let you set the maximum level for each crossover output. Limiters are used to help protect speaker components and ears from damage by excessive levels. Levels above the preset threshold

are reduced automatically by the limiter circuit.

If your TDM 24CX series crossover has limiters installed, you will find a set of small, yellow, “trimmer” knobs recessed into the bottom of the unit—one near each crossover output. Use a small screwdriver to adjust these. The units are shipped from the factory with the trimmers set fully counter-clockwise. In this position there is no limiting. As you turn the trimmers clockwise, you lower the limiting threshold, thus reducing the maximum output signal for a given crossover output.

Set up and adjust the crossover for normal operation, then set the limiter thresholds as the final step. One easy, effective way to set the limiter thresholds is by using any audio signal. Increase the level of this signal until it just passes the threshold. In other words, keep increasing the volume until it is slightly louder than you would ever want it to be. Then reduce the limiter threshold by turning the little yellow trimmers clockwise until the volume of the signal is reduced adequately. For example, if you want to set the limiters so that your amplifiers are never driven into clipping, set up an input signal and increase it in volume until the amps just begin to clip; then reduce the limiter threshold for each output until that output’s amp channel is no longer clipping.

Electronic Crossover Owner’s Manual

Page 19