![]() Set all headunit EQ settings and bass controls to 0. Install the remote gain knob and turn it 1/2 way up (the midpoint on the dial) 6. You can select the subsonic filter frequency (frequency at which you want to begin filtering) and subsonic filter slope (the rate at which you want to attenuate the frequencies). Set the amp gain to minimum (all the way to the left) 5. You can set the subsonic filter on your 1723 Series Subwoofers in the Crossover Menu and for the 1961 Subwoofers in the Setup Menu. It is recommended to set up a very subsonic filter with a very steep slope (attention factor) to combat this issue. A subsonic filter is a component on your subwoofer that reduces the intensity of notes which come through at lower frequencies. These warps can produce frequencies well below 20Hz and can introduce distortion into your playback system. Adjust the control knob or enter the frequency in the settings menu, depending on your equipment. Set the amplifier's subsonic filter to its lowest setting Start playing a test tone whose frequency is equal to the desired low pass filter setting, say 80hz. Set the subsonic filter frequency to the determined value from step 1. Subsonic Filters are particularly important if you spin vinyl records as they can have possible warping that causes a phenomenon known as woofer pumping. Set the Subsonic Filter: Access the subsonic filter settings on your amplifier, receiver, or dedicated subwoofer crossover. They are a good thing to have on a ported box since it will keep the sub from playing frequencies too far below the tuning frequency at loud levels, keeping the sub from unloading. It will attenuate the frequencies below the setting (in this case, 26hz). Think of the filter as a slope, not an on-off switch. Subsonic filter is basically a highpass filter for the subwoofer. So, if it’s tuned to 40 Hz, set the filter knob to 30 Hz. ![]() Therefore, to get your subsonic filter setting, take your subwoofer’s tuned frequency and multiply it by 0.75. Then set your phono preamp budget to match the quality of your turntable, cartridge, and stereo system. Rumble is caused by a turntable’s bearings or by warped records. ![]() It’s the opposite of a low-pass filter, which only attenuates signals above a certain line.įor example, If your subsonic filter is set to 40 Hz, 30 Hz notes will still get through but will be much quieter. Each octave up is twice as many Hz as the previous one, and dividing any frequency by 2 takes it one octave lower. A subsonic filter removes inaudible low-frequency vibrations called rumble. In other words, it’s what we know as a high-pass filter: a filter that lets through signals above a certain Hz threshold and attenuates any signal below that threshold. It decreases the amplitude of those low notes that you feel more than you hear. A subsonic filter is a component on your subwoofer that reduces the intensity of notes which come through at lower frequencies. ![]()
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