The Acoustilyzer is a handheld audio test instrument with a wide range of acoustical measurement functions, such as testing and monitoring of sound pressure level at concerts, room acoustics and speech intelligibility STI-PA.

The practical blend of electrical and acoustical functions, combined with computer connectivity through the standard USB interface, positions AL1 to be an indispensable tool for every sound/system contractor, installer and multi-media specialist.

Acoustilyzer Features

Sound Level Meter In addition to the familiar instantaneous and integrated sound pressure level (SPL) measurements, the repeatable LEQ and LCpeak measurements complete the event monitoring requirements. The AL1 visualizes the actual audio spectrum (RTA) without interrupting ongoing sound level measurements. All measurement results may be logged to the internal memory for further investigations.

RTA, Real Time Analyzer The enhanced real time spectrum analyzer (RTA) features high speed measurements with selectable 1/1 and 1/3 octave bandwidth. The RTA simultaneously provides real time single band SPL and LEQ measurements complying with the IEC 60804. Stored spectra may be averaged or combined by using the available mathematical functions. The “Max-Min” display is particularly helpful for finding dominant room modes and characterization of listening areas.

Zoom FFT Extremely fast, real-time Zoom FFT with resolutions up to 0.7Hz over the entire frequency range. The ideal tool for visualization of comb filters and narrow band effects. Features detailed cursor readout and data storage.

RT60, Reverberation Time Reverberation time is measured in accordance with ISO3382 in octave audio bands (8 bands from 63Hz to 8kHz), including smart trigger- and ranging features. The test result reliability is displayed with confidence indicators. Suitable gated pink noise sequences are included in the Minirator MR-PRO and on the supplied Test-CD.

Delay Time The propagation delay time measurement for speaker setups is conducted between the electrical input of the AL1 and the built-in microphone. Automatic difference calculation simplifies the verification of correct delay arrangements for larger halls and auditorium. A designated chirp is provided by the Minirator MR-PRO or the supplied Test-CD.

Electrical Measurement Functions Besides the polarity verification for speakers and systems the AL1 includes basic electrical functions like Level RMS and distortion (THD+N) measurement. Unique smart features, like the "Balance indicator" (immediately showing balanced / unbalanced problems of the connected signals), supports fast debugging of audio systems.

Speech Intelligibility STI-PA (optional) The STI-PA analyzer option allows durable and reliable speech intelligibility measurement within 15 seconds. Besides the single value STI or CIS test result, a detailed view of modulation indices and individual band level results is provided. The STI-PA analyzer includes amplitude weighting in accordance with the 2003 IEC 60268-16 standards release. A designated STI-PA test signal is provided by the Minirator MR-PRO or the supplied Test-CD. Acquired measurements may be referenced to previously established background noise level spectra's with automatic recalculation of the STI values.

Required Accessories

MiniSPL  Measurement Microphone

The AL1 requires a measurement microphone for acquiring acoustical signals. NTI offers the following microphones: MiniSPL, class 2 acc. IEC 61672 M2010, class 1 frequency response When using the M2010 an external phantom power supply is required and the microphone is not directly hard-mounted to the AL1.

For Minilyzer Customers