A low-frequency siren (rumbler-type system) emits a 150–500 Hz band that penetrates bodywork and closed windows — the driver of a sound-insulated car not only hears the signal but feels it. The REZON system installs alongside the main siren: it synchronizes with its tones automatically, shifting them two octaves down.
Low-frequency generator module (sync)The band you feel.
A 150–500 Hz low-frequency module with two dedicated REZON speakers — two octaves below the siren, synchronized with its tones. A signal you feel through the bodywork: it penetrates insulated cabins, closed windows and city noise.
Low-frequency generator module (stand-alone)Low band. Own signal.
A stand-alone 150–500 Hz low-frequency generator with its own signal — works without EMCORE Ultra or any base amplifier. The shortest route to a vehicle you feel before you hear it.
Dual-Siren generator moduleLower. Deeper. Further.
A Dual-Siren module in an aluminum housing: a 150–1800 Hz band in one module — low and high tones at once, synchronized with the main amplifier. Depth and reach a single siren cannot achieve in dense traffic.
A low-tone siren generator in two variants: REZON synchronizes with the EMCORE ULTRA amplifier (−2 octaves), while REZON PLUS+ runs as an independent generator with its own signal. Both drive dedicated low-frequency speakers (a siren subwoofer, 180–500 Hz band, 100 W RMS) mounted at the front, rear or under the bumper.
The dual-tone variant emits low and high tones across the full 150–1800 Hz band through TS-100F-family speakers, synchronized −1 octave against the main siren — longer acoustic reach without a second speaker path.
Cabin insulation and audio systems suppress the siren's high tones; a low-frequency signal travels through the body structure — drivers feel the vibration before they locate the sound. It is the standard in ambulances and police cars working dense urban traffic, junctions and congestion.
E20 · ECE R65 class 2 · ECE R10 type approvals — every configuration tested in our own laboratory.
Answer not here? Call us — an engineer picks up, Mon–Fri 7:00–15:00 (CET).
No — it is a supplement: the main siren (500–1800 Hz) provides range and the type-approved signal, while the low-frequency path (150–500 Hz) provides effectiveness inside insulated cabins. REZON follows the siren automatically.
Describe the vehicle and the fleet's duties — we will propose a set with the full type-approval documentation.
