KS Series Crossover Settings – Do and Don’t


All three KS Series Active Subwoofers feature powerful DSP, which allow you to adjust a number of useful parameters. Among these is the crossover frequency (low-pass). Now, to perfectly match your KS active subwoofer with your top active loudspeakers, you need to choose a suitable crossover frequency (80 or 100 Hz) – and apply the correct setting to both subwoofer and top loudspeakers. However, what happens if you don’t? Well, let’s look at it:

  1. Subwoofer set at 80 Hz, top loudspeaker set at 80 Hz: very good summation of both responses, with powerful bass. Additionally, the low 80 Hz crossover setting reduces low frequencies localization cues.
  2. Subwoofer set at 100 Hz, top loudspeaker set at 100 Hz: smooth crossover summation as well as additional headroom for the top loudspeaker, which reproduces a narrower audio bandwidth.
  3. Subwoofer set at 100 Hz, top loudspeaker set at 80 Hz: now both units are reproducing the same energy between 80 Hz and 100 Hz, generating extra bass level.
  4. Subwoofer set at 80 Hz, top loudspeaker set at 100 Hz: the crossover region will not display a flat, smooth frequency response. There will be a notch of -5 dB centered around 90 Hz, which will translate to a loss in bass reproduction.

So, the appropriate adjustment of your crossover is important to get the best out of your QSC active subwoofers and loudspeakers.

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