High-Pass Filter (HPF)
Definition
A filter that allows frequencies above a set cutoff point to pass through while attenuating frequencies below it. Used to remove low-frequency rumble, hum, or unnecessary bass content from signals.
In Simple Terms
Cuts everything below a chosen frequency. Use it on vocals, guitars, and anything that doesn't need deep bass — it removes rumble and muddiness you didn't even know was there. Probably the most-used tool in mixing.
In Practice
A high-pass filter set at 100 Hz on an acoustic guitar channel removes low-frequency room rumble that muddies the low-mid range of the mix.
Common Confusion
Despite the name, a high-pass filter removes lows, not highs. It passes the highs.