Home > Products & Shop > NTi Test Equipment > AL1 Acoustilyzer

To order NTi products call 01727 569521

AL1 Acoustilyzer

AL1 Technical Specifications    
NTi AL1 Acoustilyzer

The Acoustilyzer is a handheld sound level meter and acoustic analyser for measuring and monitoring sound pressure levels, room acoustics and speech intelligibility STI-PA. The practical blend of electrical and acoustical functions, combined with computer connectivity, positions the AL1 Acoustilyzer as an indispensable tool for every sound system contractor, installer and multi-media specialist.


  • Sound Level Meter
    • Instantaneous and integrated sound pressure level (SPL) measurements
    • Repeatable LEQ and LCpeak measurements
    • Results may be logged to the internal memory for further investigations.
  • Real Time Analyser
    • Enhanced real time spectrum analyser (RTA) features high speed measurements with selectable 1/1 and 1/3 octave bandwidth
    • Simultaneous real time single band SPL and LEQ measurements complying with 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.
    • Ideal tool for visualization of comb filters and narrow band effects
    • 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
    • RT60 with 1/3 octave resolution supported by post processing
    • 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
    • Designated chirp is provided by the Minirator MR-PRO or the supplied Test-CD
  • Electrical Measurement Functions
    • Polarity verification for speakers and systems
    • Level RMS and distortion (THD+N) measurement
    • Smart features, like the "Balance indicator" (immediately showing balanced / unbalanced problems of the connected signals), supports fast debugging of audio systems
  • MiniLINK PC Software
    • MiniLINK supports documentation and data acquisition of all measurement functions
    • The AL1 stores test results in the internal memory, thereafter screenshots and measurement data can be transferred to PC for post processing
    • AL1 features direct online logging of all measurement data to PC
    • MiniLINK acts as AL1 power supply for longterm operations and supports all PC's with Windows 2000 + SP3, XP, Vista, Win7 (32 & 64 Bit) and pre-installed USB interface
Product code: AL1 :: NTI 600 000 080
Palm sized acoustic analyser £POA

STI-PA Option

The STI-PA analyser option allows durable and reliable speech intelligibility measurements 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 analyser 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.

Product code: AL1-STIPA :: NTI 800 000 013
Firmware option for speech intelligibility £POA

Measurement Microphones

The AL1 requires a measurement microphone for acquiring acoustical signals. NTi Audio offers the following microphones:

When using the M2010 an external phantom power supply is required and the microphone is not directly hard-mounted to the AL1.

Product code: MINISPL :: NTI 600 000 022
Class 2 1/2" measurement microphone £POA
Product code: M2010 :: NTI 600 040 010
Class 1 1/2" measurement microphone £POA

MiniLINK PC Interface

MiniLINK, the optional USB interface and PC Software, allows documentation and data acquisition of all ML1/AL1/DL1 functions. With MiniLINK the instruments are able to store and transfer screen shots and measurement data for post processing.


Product code: MINILINK :: NTI 600 000 033
MiniLINK PC Interface £POA

Soft Pouch

The soft pouch protects the AL1 Analyser against shock and dust and incorporates a convenient belt-clip.

Soft pouch for ML1
Product code: AL1-SOFT-POUCH ::NTI 600 000 012
Soft pouch for AL1 analyser £POA

ML1/AL1 Crossgrade

The ML1 - AL1 Crossgrade package enables loading the Acoustilyzer AL1 firmware onto the Minilyzer. For more details on the functionality see Acoustilyzer AL1

AL1/ML1 Crossgrade software package
Product code: ML1/AL1 CROSSGRADE :: NTI 800 000 012
Software to swap AL1 to ML1 and vice versa £POA

Minstruments System Case

Store your valuable test instruments in this compact system case with with adequate extra space for your cables and connectors for those "out in the field" jobs. Fits AL1, DL1, DR2, ML1, MR1, MR-PRO. Not suitable for XL2.

AL1/ML1/DL1 minstruments system case
Product code: MINSTRUMENTS-CASE :: NTI 600 000 020
Minstruments system case for AL1/DL1/DR2/ML1/MR1/MR-PRO £POA

Calibration Certificate

Although the AL1 is factory calibrated before despatch it is not routinely supplied with a calibration certificate but one may be bought if required.

Product code:AL1-CAL-CERT :: NTI 600 000 018
AL1 calibration certificate when initially purchased with new AL1 meter £POA
Product code:AL1-RECAL+CERT :: NTI 600 000 015
Factory recalibration of AL1 with certificate £POA