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:
- 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.
- 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.
- 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.
- 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.