Svantek » Products » SP 91 – Acoustic Pulse Source

Acoustic Pulse Source SP 91

The SP 91 is a hand-operated acoustic pulse source designed for measuring reverberation time (RT60) in small and medium rooms and open or echoey spaces up to approximately 200 m² (600 m³). With peak sound levels up to 125 dB(C), SP 91 delivers a strong, broadband impulse suited to accurate acoustic decay analysis, while its purely mechanical construction provides consistent, repeatable performance without batteries or external power.

As a durable, sustainable alternative to disposable sound sources such as balloons, SP 91 supports building acoustics measurements and educational demonstrations. Each set includes the acoustic pulse source SP 91, hearing protection, and a lightweight carrying bag for convenient transportation and storage.

RT60 impulse

New release

Peak 125 dB(C)

Product Highlights

Hand-operated broadband pulse source: RT60 measurements in small/medium rooms and open/echoey spaces up to ≈200 m² (≈600 m³).
Peak impulse level >125 dB(C): Measured at 1 m in semi-free field for reliable decay analysis.
Purely mechanical operation: No batteries or external power; consistent, repeatable impulses.
Broadband, even spectrum: Well-distributed frequency content supports frequency-dependent RT60 analysis.
Durable, sustainable alternative: Replaces disposable sources such as balloons.
Robust construction: Wood-based materials, textile, metal, and porous absorber filling.
Compact and lightweight: 300 × 150 × 100 mm; ≈2.27 kg for easy transport.
Supplied as a set: SP 91 unit, hearing protection, and lightweight carrying bag.

Features

Ready to use in field

Mechanical, battery-free operation

Hand-actuated impulse generation suits deployment in small and medium rooms and open or echoey spaces up to ≈200 m² (≈600 m³). Consistent, repeatable output supports RT60 measurements without external power.

Impulse RT60 made easy

Broadband, strong impulse

Peak levels >125 dB(C) at 1 m (semi-free field) provide a clear, broadband response for reliable acoustic decay analysis. Even spectral content supports frequency-dependent RT60 evaluation.

Robust and compact

Durable build, easy transport

Wood-based, textile, and metal elements with porous absorber filling support long service life. The SP 91 set includes hearing protection and a lightweight carrying bag; compact form factor (300×150×100 mm; ≈2.27 kg) facilitates movement between measurement locations.

Ready to use in field

Mechanical, battery-free operation

Impulse RT60 made easy

Broadband, strong impulse

Robust and compact

Durable build, easy transport

A spectrum comparison with other sources

Comparative plots benchmark SP 91 against other impulse sources—such as balloons—providing clear visibility of level-distribution differences relevant to RT60 assessment in small and medium rooms and echoey spaces. Spectrum characteristics and comparisons with other impulse sources (e.g., balloons) indicate balanced frequency distribution, underscoring the suitability of the SP 91 acoustic pulse source for building-acoustics diagnostics and room-acoustic tuning.

Download Catalogue (PDF)

A spectrum comparison with other sources

Applications

Building and room acoustics

Rapid reverberation-time (RT60) assessments in small and medium rooms

The SP 91 acoustic pulse source enables rapid reverberation-time (RT60) assessments in small and medium rooms and in open or highly reflective spaces up to ≈200 m² (≈600 m³). A powerful broadband impulse—peaks up to 125 dB(C) at 1 m in semi-free field—yields clean decay curves and sufficient signal-to-noise for frequency-dependent analysis. Purely mechanical operation supports repeatable multi-position measurements without external power, facilitating on-site surveys and educational demonstrations.

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