What is Subsonic on Amplifier – Subsonic on an amplifier is a low-frequency filter (also called a subsonic filter or infrasonic filter) that removes extremely low bass frequencies below the audible range or the speaker’s capability. It typically cuts frequencies under 20–30 Hz.
How Subsonic Filter Works
Amplifiers send power to speakers or subwoofers. Very low frequencies (subsonic) produce sound waves your ears barely hear but that demand huge power and physical movement from the speaker cone.
The subsonic filter acts like a high-pass filter for bass. It blocks these unwanted ultra-low frequencies while letting the strong, audible bass through. You usually adjust it with a knob or settings on the amp.
Why You Need Subsonic on Amplifier
- Protects subwoofers from damage caused by excessive cone excursion
- Reduces distortion and amplifier strain
- Improves overall sound clarity
- Prevents wasted power on inaudible rumble
It pairs well with a low-pass filter to create a clean bass range.
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Subsonic vs Low-Pass Filter
| Feature | Subsonic Filter | Low-Pass Filter |
|---|---|---|
| Purpose | Cuts frequencies too low | Cuts frequencies too high |
| Typical Setting | 15–35 Hz | 60–120 Hz (for subs) |
| Effect | Protects from overload | Prevents midrange bleed into bass |
When to Use It
Turn on or adjust the subsonic filter when:
- Playing music with heavy bass
- Using ported subwoofer boxes
- Noticing distortion or rattling at high volumes
- Tuning a car audio system for clean, powerful bass
Set it slightly below the tuning frequency of your subwoofer enclosure for best results.
FAQs : What is Subsonic on Amplifier
Should the subsonic filter always stay on?
Yes for most car audio setups, especially with powerful amps and subs. It protects your equipment.
What frequency should I set subsonic to?
Start around 20–25 Hz and adjust based on your subwoofer specs and enclosure type.
Does subsonic affect bass quality?
It improves quality by removing muddy, inaudible lows and reducing distortion.
Is subsonic only for car amplifiers?
No. Home theater and professional audio amps also use it, though car audio systems use it most often.