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            ProAudio: Setting Up a Subwoofer & Crossover Filters (Config Tool)

            Last updated: 23 Jul 2026



            Each zone has a crossover filter that can pass only low frequencies, only high frequencies, or be disabled entirely. This is what lets a subwoofer handle the bass while the main speakers handle everything else, without either one straining or distorting.

            You'll need the ProAudio Config Tool, available to registered installers at monitoring.pulse-eight.com/Downloads/ProAudioConfigTool.
            Setting up a subwoofer zone? It should usually also be locked to its paired speaker zone so it follows the same source and volume changes — see Locking Two (or More) Zones Together (Config Tool).

            Opening the Filter Settings

            1
            Open the Config Tool and select your switch.Pick your ProAudio unit from the Device Discovery list. If it isn't listed, enter its IP address directly in the Connect by IP Address section at the bottom of the page.
            A screenshot of a computer AI-generated content may be incorrect.
            Select your switch from the discovery list, or connect by IP address.
            2
            Open the filter settings for your zone.On the zone you want to configure — in this example, Zone 1 — click the crossover filter icon in the zone's icon row.
            Click the crossover filter icon on the zone you want to configure.
            3
            The filter panel opens.You'll see two dropdowns for this zone: Filter Type and Filter Frequency, plus a Mode setting.
            Filter Type and Filter Frequency for the selected zone.

            Setting the Filter Type

            Available Filter Type options.

            If these don't mean much yet, that's fine — as a starting point, use 24 dB/Octave Low Pass on the subwoofer zone and 24 dB/Octave High Pass on the main stereo speakers zone. The 12 dB vs. 24 dB choice controls how sharply the filter cuts off frequencies beyond the crossover point — it's safe to experiment and listen for what sounds best.

            Setting the Filter Frequency

            The Filter Frequency dropdown sets the crossover point — the frequency where the subwoofer hands off to the main speakers.


            Filter Frequency options range from 50 Hz to 300 Hz.

            Both the subwoofer and the main speaker zone should be set to the same frequency. It's typically somewhere between 100 Hz and 150 Hz, though the full range runs from 50 Hz to 300 Hz — again, safe to experiment and listen for what sounds best.

            Both Filter Type and Filter Frequency must be set for the filter to actually engage. If either one is left at "No Filter," the crossover filter stays disabled — even if the other one has a value selected. There's no warning for this, so if a filter doesn't seem to be doing anything, check that both dropdowns are set.

            Backing Up the Filter Settings

            Back up after every change. Without this, a power outage can silently revert your filter settings.
            1
            Tick "Zone Audio Parameters."On the right-hand side of the Config Tool, check the box for Zone Audio Parameters.
            2
            Click "Save Selected."The Command History should show ^SS 512$ followed by ^+$, confirming the save was accepted.
             
            Tick Zone Audio Parameters, click Save Selected, and confirm ^SS 512$ / ^+$ in the Command History.

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            Need help with your subwoofer setup?

            Our support team can help troubleshoot crossover filter or Config Tool issues.

            UK: 01202 413 610 | US: (858) 748-8250 | support@pulse-eight.com