What is HPF (or Subsonic Filter)?

The acronym HPF stands for High Pass Filter, which is also known as a High Cut Filter.

It allows only the sounds above the selected frequency to pass through.

👉 Practical example:

• If the filter is set to 10 Hz, almost all audio will pass through (since 10 Hz is extremely low).

• If it’s set to 1,000 Hz, only higher-pitched sounds above 1,000 Hz will be sent to the speakers.

This feature is very useful for protecting speakers.
For example, a driver or tweeter (which is responsible for high frequencies) can be damaged if it receives bass signals.
The HPF prevents this by blocking low frequencies, allowing only what the speaker is designed to handle.

🔊 Examples in Taramps amplifiers:

• In some series like DS and TS, the HPF comes fixed at 90 Hz, allowing only frequencies above this value to pass through.

• In other series such as HD and MD, the HPF is adjustable (usually between 10 Hz and 90 Hz), allowing you to fine-tune it according to your project — without needing an external crossover.