ProAudio: Setting up the Subwoofer / Setting up the Subwoofer Crossover Filters (PuTTY)

Modified on Thu, 17 Jun, 2021 at 11:13 AM

Each zone has a cross over filter that can allow only high frequencies, or only low frequencies to pass, or be disabled (and allow all frequencies to pass). To enable a  filter, both the filter type and the filter frequency has to be set before the filter is enabled.

For the following example, we're assuming the main stereo speakers are connected to zone 1, and the subwoofer is connected to zone 2.

Start by picking the type of filter and slope:

0 - Disabled, the filter is bypassed. 

1 - Also disables the filter, but you should use 0.

2 - 12dB / Octave Low Pass Filter

3 - 12dB / Octave High Pass Filter

4 - 24dB / Octave Low Pass Filter

5 - 24 dB / Octave High Pass Filter

and then sending the command:

  • ^FTYPE @1,5$                    ; set the stereo speakers to use a 24dB / octave high pass filter
  • ^FTYPE @2,4$                    ; set the subwoofer to use a 24dB / octave low pass filter

If these don't make sense, that's fine. Use '4' (24dB / Octave Low Pass Filter)  for the subwoofer zone and '5' (24dB / Octave High Pass Filter) for the main stereo speakers zone. The 12dB / 24dB is the sharpness of the filter, how fast it cuts off high or low frequencies. Experimenting with this setting and listening for what sound best, cannot hurt anything.

Now pick the crossover frequency:

0 - Disabled, the filter is bypassed.

1 = 50Hz               9 = 79Hz               17 = 126Hz          25 = 200Hz

2 = 53Hz               10 = 84Hz            18 = 133Hz          26 = 212Hz

3 = 56Hz               11 = 89Hz            19 = 141Hz          27 = 224Hz

4 = 59Hz               12 = 94Hz            20 = 150Hz          28 = 238Hz

5 = 63Hz               13 = 100Hz          21 = 159Hz          29 = 252Hz

6 = 67Hz               14 = 106Hz          22 = 168Hz          30 = 267Hz

7 = 71Hz               15 = 112Hz          23 = 178Hz          31 = 283Hz

8 = 75Hz               16 = 119Hz          24 = 189Hz          32 = 300Hz

 

and send the frequency command using the above table to select a frequency:

  • ^FFREQ @1@2,16$          ; set the crossover frequency for stereo and subwoofer speakers to 119Hz

Experimenting with this setting and listening for what sounds best, is encouraged. Both the main speakers and the subwoofer should be set to the same frequency. When going up in frequency, this setting indicates the frequency the subwoofer stops working and the main speakers take over. This value is usually between 100Hz and 150Hz, but we allow values between 50 and 300Hz.

Note: Changes to this command should be backed up in case of power failure by sending the "SS" command:

  • ^SS 512$              ; Backup zone settings

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