High-Pass Filter, 300 Hz and 500 Hz – RDL ST-HP3

RDL ST-HP3 — High-Pass Filter, 300 Hz and 500 Hz

The RDL ST-HP3 is a purpose-built high-pass filter offering 300 Hz and 500 Hz cutoff frequencies for audio signal conditioning. It is intended to remove low-frequency rumble and subsonic energy that can degrade intelligibility and overburden speakers or downstream electronics. By attenuating unwanted low-frequency content, the device helps maintain clearer audio and more reliable system performance in installed sound and pro-audio environments. The unit addresses common field challenges such as HVAC rumble, handling noise, and low-frequency hum that affect microphones and line-level signals. It is suitable for integration into new equipment designs or as a service part for maintenance and repair tasks. The ST-HP3 supports consistent, repeatable filtering where fixed cutoff points are required for system tuning and protection.

Key Features:

• High-pass filtering for audio signal conditioning
• Provides 300 Hz and 500 Hz cutoff frequencies
• Reduces low-frequency noise and rumble to protect downstream equipment

Specifications:

• Manufacturer: RDL
• MPN: ST-HP3

Applications include use by field installers and low-voltage technicians for improving installed audio clarity, OEM customers integrating consistent low-frequency roll-off into manufactured equipment, and MRO operations performing maintenance or upgrades to existing systems. The ST-HP3 is appropriate where fixed high-pass filtering is required to protect speakers, mixers, or downstream electronics from subsonic energy.

Tri-Tek Electronics is an authorized distributor of this product with full manufacturer warranty support and nationwide availability.