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NTi Audio MiniSPL Analyzer Measurement Microphone for Acoustilyzer AL1 and Minilyzer ML1

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The MiniSPL is the ideal accessory for the Acoustilyzer AL1 and Minilyzer ML1. Its self-powered design, the individual factory adjustment and the auto power-off control combine to make MiniSPL an accurate, easy to handle yet affordable measurement microphone.The servo-loop output stage design sup... Read More

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The MiniSPL is the ideal accessory for the Acoustilyzer AL1 and Minilyzer ML1. Its self-powered design, the individual factory adjustment and the auto power-off control combine to make MiniSPL an accurate, easy to handle yet affordable measurement microphone.

The servo-loop output stage design supports long cable connections between the analyzer and the microphone - up to several hundred meters. MiniSPL is also recommended and easy to use in conjunction with PC based measurement systems with high quality audio cards.The MiniSPL measurement microphone includes following additional items: 1x Windscreen; 1x Microphone-holder + Adapter 5/8" - 3/8"


  • 1/2" Measurement Mic
  • Battery Powered
  • Balanced Output
  • Omni-directional
  • Individually Adjusted
  • Auto Power-Off Control

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Product Specs

MR Pro
OutputsBalanced XLR, unbalanced RCA
phantom power resistant
InputsDC power supply, USB
XLR for cable test
Wave FormsSine, Pink Noise, White Noise
Polarity test signal, Delay test signal
Wave File Format
Sampling freq48 kHz
Resolution16 Bit, Mono & Stereo
Output level0 dBFS = 18 dBu (sine)according to EBU R68
Frequency setting
Range 10 Hz - 20 kHz
Incrementin 1 digit steps
Accuracy 0.01%
Stepped Sweep Function
Freq. rangefreely selectable
Increment1/1, 1/3, 1/6, 1/12 octave
Sweep speedselectable 0.5 - 5 seconds
Continuous Sweep (Chirp) Function
Freq. rangefreely selectable
IncrementLinear / Logarithmic
Chirp speed 1.0 - 99 seconds per cycle
Level UnitsdBu, dBV, V
dBFS, %
Output Level Ranges
Sine, Sweep, Chirp- 80 dBu to +18 dBu
White Noise- 80 dBu to +10 dBu
Pink Noise- 80 dBu to + 8 dBu
Polarity, Delay Test- 80 dBu to +16 dBu
Flatness ± 0.2 dB
Accuracy @ 1kHz± 0.2 dB
22 Hz - 22 kHz, average, @ 1 kHz, typical-96 dB (0.0016 %) @ 18 dBu
Noise Floor typ. 15 μV
Output Impedance12.5 Ohm balanced
Imax = 10 mA
Impedance Measurement
Method Absolute value Z
Meas. range4 Ohm - 50 kOhm balanced
2 Ohm - 25 kOhm unbalanced
@ f = 30 Hz to 10 kHz (Sine)
@ Level from -20 to +18 dBu
Accuracy ± 10 % or ± 2 Ohm
Phantom Power Reading
Meas. range0 - 54 V
Accuracy± 3 % or ± 0.5 V
USB FunctionalityFirmware update
Mass Storage Device
Flash Memory32 MByte
for storing wave files and configurations
Display Graphical, with back light
Auto-Power-Off10, 30, 60 minutes or OFF
Batteries3 x AA Alkaline dry cells or rechargeable equivalents
Battery Life typical - 10 h
Temperature range0° to 45° C (32° to 113° F)
Humidity < 90% rel. humidity, non-condensing
Dimensions (LxWxH)152 x 81 x 43 mm
(incl. protective shock jacket)
Weight310 g (11 oz.) (including batteries)
Sound Pressure Level•Leq, short-time Leq , Lmin, Lmax acc. IEC 61672, DIN15905-5, SLV 2007•Timer for single and repeated measurements

•Dynamic range (using MiniSPL): 30 - 130 dBSPLA•Filters: Flat, A- and C-weighted, X-Curve-1, RLB

•Logging of SPL/LEQ results into AL1 memory•Wideband- and RTA values simultaneously available
Real Time Analyzer•1/3 or full octave band resolution, class 0 filters•SPL, LEQ and Max-Min display per band

•Fast logging of results to the PC
Zoom FFT•Real-time Zoom FFT with 50% overlapping, 93 Bins•Frequency Range: 10 Hz - 20 kHz

•Resolution: 187.5 Hz to 0.73 Hz
Reverberatinon Time•1/1 Octave band resolution, based on T20 results, according to ISO3382•1/3 Octave band resolution with post processing

•Automatic averaging with individual result readout and storage•Source signal: Gated pink noise (from Test-CD or Minirator)
Polarity Test•Positive / Negative detection through internal microphone or XLR/RCA connector.•Checks polarity of tweeters, midrange-speakers, woofers, sub-woofers and cables.

•Down to 10 dB S/N ratio of input signal.•Testsignal: NTi Audio Polarity Signal (AL1 Test CD oder Minirator)
Delay Time•Propagation delay between electrical and acoustical signal input using built-in mic. Resolution < 0.1 ms, max time: 1 s•Dedicated test signal: NTi Audio chirp (from Test-CD or Minirator)
STIPA (Option)•Single value STI and CIS test result. Modulation indices and individual band level results accessible. Error indicator.•According to IEC 60268-16, 2003 release

•TNO verified algorithm•Post processing with recorded spectra supported
Electrical•Level: RMS, THD+N, Frequency, Polarity• Filters: Flat, A- and C-weighted, HP400, HP19k
LevelUnits: dBu, dBV, VRMSAccuracy: ± 0.5 % @ 1 kHz

Flatness: ± 0.1 dBBandwidth: 20 Hz to 20 kHz

Resolution: 3 digits (dB-scale) or 4 digits (V-scale)
FrequencyRange: 10 Hz to 20 kHzResolution: 4 digits

Accuracy: < ± 0.1 %
THD+NMeas. Bandwidth: 10 Hz to 20 kHz

Resolution: 4 digitsResidual THD+N: balanced < -85 dB @ -10 dBu to +20 dBu

Residual THD+N: unbalanced < -74 dB @ 0 dBu to +14 dBu

Data logging

•Interneral device memory for up to 580 records•USB interface to MiniLINK PC software

•Online data logging from Acoustilyzer directly to PC
Input ConnectorsXLR balanced, RCA unbalanced
Impedance40 kOhm balanced, 20 kOhm unbalanced
Max. AC Input

•balanced +20 dBu (7.75 VRMS),

•unbalanced +14 dBu (3.8 VRMS)• for input levels > 20 dBu (balanced) the accessory Adapter -20 dB is available

Max. DC Input± 50 VDC
Residual Noise< 12 µV, XLR-input shorted
Internal MicrophoneOmni directional (for polarity and delay measurement only)
Monitor OutputJack 3.5 mm (1/8“), suitable for all common headsets
DisplayGraphic LCD 64 x 100 pixel, with backlight
Batteries3x AA batteries (alkaline)
Typical battery lifetime > 16 hours
Dimensions163 x 86 x 42 mm (6.4“ x 3.38“ x 1.63“)
Weight300 g (10.5 oz) incl. batteries
Temperature0° to +45° C (32° to 113° F)
Humidity90 % R.H., non condensing

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