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Sound Level Meter
Class 1 LA-4441A
Class 2 LA-1411/1441A

ONO SOKKI’s sound level meters LA-1411/1441A (Class 2) and LA-4441A (Class 1) comply with IEC 61672-1:2013 and JIS C 1509-1:2017. These models can simultaneously measure seven sound parameters, including the equivalent continuous sound level, and display selected parameters without needing to adjust for sound fluctuation. Featuring an exclusive coaxial cable, the microphone can be used remotely from the main unit. With a curved body and intuitive menu, these meters offer enhanced usability. Additionally, the LA-1441A/4441A models can quickly transfer data to a PC via RS-232C or USB and can be remotely controlled from a PC.




●Sound level meter (Class 2) for product testing and measuring the sound level generated from machines etc.
●High-performance and cost-effective model

●Sound level meter (Class 2) for measuring the working environment and environmental noise
●Auto measurement function by timer and trigger.
●Level trend can be recorded at the interval from 1ms. (Lp memory function)
●Equipped with USB and RS-232C interfaces

●Sound level meter (Class 1) for sound analysis and product testing.
●Time weighting (10ms, Impulse) corresponding to the fast sound fluctuation.
●Level trend can be recorded at the interval from 1ms. (Lp memory function)
●Equipped with USB and RS-232C interfaces


ONO SOKKI’s LA series sound level meters can simultaneously measure and selectively display seven sound parameters, including the equivalent continuous sound level (Leq). These parameters include time-weighted sound level (Lp), time-average sound level (Leq), sound exposure level (LE), maximum time-weighted sound level (Lmax), minimum time-weighted sound level (Lmin), peak sound level (Lpeak), and percentile sound pressure level (LN). The microphone can be detached from the main unit using exclusive coaxial cables, enabling distant measurements. By connecting to a Windows-based PC via RS-232C or USB, the LA series can easily and quickly transfer data to the PC and be remotely operated from the PC (excluding LA-1411).

System Configurations


Applicable standard

IEC 61672-1 : 2013 Class 2

IEC 61672-1 : 2013 Class 1

JIS C 1509-1 : 2017 Class 2
JIS C1516 : 2020 Class 2

JIS C 1509-1 : 2017 Class 1
JIS C1516 : 2020 Class 1

1/2-inch backelectret-type
condensor microphone MI-1433
Nominal sensitivity level:-29 dB

1/2-inch backelectret-type
condensor microphone MI-1235
Nominal sensitivity level:-29 dB


MI-3111 Preamplifier for mocrophone

Linearity range

100 dB (Wide range), 80 dB (Normal range)

Measurable frequency range

10 Hz to 8 kHz(IEC, JIS)

10 Hz to 20 kHz(IEC, JIS)
Measurement level range

A : 26 to 135 dB(IEC, JIS)
C : 31 to 135 dB(IEC, JIS)
Z : 36 to 135 dB(IEC, JIS)

A : 27 to 135 dB(IEC, JIS)
C : 30 to 135 dB(IEC, JIS)
Z : 35 to 135 dB(IEC, JIS)
Frequency weighting


Intrinsic noise

A : 20 dB or less
C : 25 dB or less
Z : 30 dB or less

A : 19 dB or less
C : 22 dB or less
Z : 27 dB or less

Level range

20 to 90 dB, 30 to 90 dB, 40 to 100 dB, 50 to 110 dB, 60 to 120 dB (Normal range),
70 to 130 dB, 40 to 120 dB (Wide range)

Time weighting


FAST, SLOW, Impulse, 10 ms
Measurement itemsLp, Leq , LE, Lmax, Lmin, Lpeak, L(Lhigh, L5, L10, L50, L90, L95, Llow, Lave)
Level trendp, every kind of calculated value

Lp, every kind of calculated value
(Read out the displayed value as auto memory recall)

Sampling interval

31.25 μs (other than LN )
100 ms(LN)

20.83 μs (other than LN)
100 ms(LN)
Measurement timeManual, arbitrary setup (199 h 59 m 59 s max.)
Total measurement timeArbitrary setup (199 h 59 m 59 s max.)
Start modeManual onlyManual, timer (Hour,minute), trigger (can be started after a lapse of specified time [0 to 10 seconds, in increment of 1 minute] after trigger detection: trigger delay function)
Internal calibration signal (REFOUT)1 kHz sine wave (For upper limit level range : -6 dB(normal range), -16 dB(wide range))
Recommended sound calibratorSC-2500A,SC-2120ASC-2500A
DisplayLCD with LED backlight semitransparent (124 x 64-dot)
Measurement value display by numeric and bar indicators
List display and trend graph display for various kinds of calculated values
Displays of date, time, measurement time, and conditions of various kinds of instruments
Display update timeDisplay by numeric:1 s, bar indicator: 0.1 s, trend screen: 0.2 s
Manual memory functionTotal calculated values: 100 addresses
Auto memory functionLeq : 1000 addresses x 200 blocks
Total calculated values: 100 addresses x 200 blocks
Lp Record memory functionSound level with time weighting is stored at the specified interval. (1000 address × 200 blocks)
Storing intervals (1 ms, 2 ms, 5 ms and 10 ms)
Measurement condition memory functionCondition memories (9 kinds)
Resume functionSettings activated at power ON can be selected from follows; settings used at previous power OFF, factory setting, and any condition memory number which is set from menu.
Backup functionThe backup of data stored in clock and memory can be performed by built-in secondary power source.
• Time for full charged: approx. 24 hours
• Backup period: more than 3 months (when stored at temperature of 23 °C)
AC output *10.707 Vrms/F.S (normal range), 2.236 Vrms/F.S. (wide range), load resistance 10 kΩ or more (with upper-limitation value of bar indicator)

Frequency weighting can be selected: conjunction with selected frequency weighting or fixed to Z-weighting.

DC output *12.5 V/F.S. (with upper-limitation value of bar indicator)
Amount of voltage fluctuation per 10 dB: 0.25 V
Load resistance: 10 kΩ or more
External control inputOperation: toggle operation of start/place in pause

Specifications of hardware: negative pulse input
 (voltage level: Low:0.0 to 0.5 V, Hi:3.0 to 50 V)

Pulse width: 100 ms or more
Absolute maximum rated input voltage: 5 V

Comparator function

(Option: LA-0141) *2

Set comparison value : 40.0 to 130.0 dB(in increment of 0.1 dB)
Comparison item : Lmax or Lpeak
Delay time : 0 ms, 100 ms, 1 s, 5 s
HOLD time : 100 ms, 1 s, 5 s, manual
Output logic : negative or positive logic
Output format : open collector
(withstand voltage:+3 to +24 VDC, current:50 mA or less)
Timer functionBuilt-in (year/month/day/hour/minute)

Control of operation, data output, print out (to the DPU-414 printer)
Baud rate : 9,600/115,200 bps

Control of main unit and data output,
USB 2.0 FULL SPEED (connecting virtual COM port)
Cable extension *3

(Between microphone and main unit)

305 m max.105 m max.
Printer function


Measurement value, measurement start/stop time,
measurement time interval, frequency weighting, time weighting

Normal (alphanumeric) or screen image Applicable printer: DPU-414

Power requirementSize AA battery × 2 pcs.
(manganese (6R) or alkaline (LR6) or oxyride (ZR6)) or PB-7090 AC adapter (option))
Battery life (continuous using)Approx. 8 hours (LR6 alkaline battery in use / 23 °C/ backlight off / not RS-232C・USB in use)
Operating (storage) temperature range-10 to 50 °C (-20 to 60 °C)
Operating (storage) humidity range25 to 90 %RH (10 to 90 %RH) with no condensations
Outer dimensionsApprox. 78(W) × 263(H) × 47(D) mm
Approx. 360 g (including batteries)

Windscreen×1 (φ 70 mm), carrying case×1, hand strap×1,
size AA battery × 2 pcs. instruction manual(CD), simple,operation guide

Option• LA-0141 Comparator output option
• SC-2500A Sound calibrator (Class1)
• SC-2120A Sound calibrator (Class2)
• AG-2010 Microphone extension cable (10 m)
• AG-2030 Microphone extension cable (30 m)
• AG-2050 Microphone extension cable with code reel (50 m)
• AG-2100A Microphone extension cable with code reel (100 m)
• PB-7090 AC adapter (120 to 240 VAC)
• AX-501 Signal input-output cable (2 m)
• AX-5022B RS-232C cable for PC (2 m)
*1 AC or DC output is selectable from menu of sound level meter.
*2 Comparator function (LA-0141, option) cannot be installed with the LA-1411.
*3 The cable length given here is the length when each of the exclusive cable sold by Ono Sokki is used. The cable length less than 30 m is applicable to CE marking.




LA-0141 Comparator output function

OutlineThis optional function outputs the signal when value exceeds the setting value. Useful for the determination of sound level under measurement.
Set comparison value40.0 to 130.0 dB(in increment of 0.1 dB)
Comparison itemLmax or Lpeak
Delay time0 ms, 100 ms, 1 s, 5 s
It can be used for the determination only when the measured value keeps exceeding against the setting value. Error-determination caused from single-shot sound can be avoided. When HOLD setting is manual, setting to delay conditions is automatically deactivated.
Hold time100 ms, 1 s, 5 s, manual
It is a time period to hold output signal even though measured value goes below the setting value. When the operating mode is manual, output signal is held until next measurement starts.
Output logicNegative or positive
Output formatOpen collector
(withstand voltage: +3 to +24 VDC, current: 50 mA or less)


The SC-2500A and SC-2120A are sound calibrators which are indispensable for sound measurement, conforming to JIS C1515:2004 ( and SC-2500A / IEC 60942:2020). The SC-2500A is Class 1 type sound calibrator with 1000 Hz and 114 dB output. It uses the sound pressure feedback control method to control fluctuations in sound pressure caused by static pressure to generate a stable sound pressure even if the operating environment changes. SC-2500A are recommended sound calibrator for LA-1411/1441A/4441A. The SC-2120A is Class 2 speaker type sound calibrator with 1 kHz and 94 dB output.

LA-0207A+LA-0208A All-weather windscreen

OutlineUsing the all-weather type windscreen reduces noise caused by the wind when performing sound level measurements outdoors, and prevents the microphone from being damaged by rain or snow. Screen diameter:Φ 200 mm
Mounting screw:1/4-20 UNS depth 6(screw for tripod attachment) * Applicable to JIS C 1509-1:2005 and IEC 61672-1:2002 when the LA-0207A and LA-0208A are attached to the sound level meter.
* Periodical exchange is necessary for the expendables (windscreen, waterproof mesh).
Illustration (AG-2000 series Microphone Extension cable)

AG-2000 series Microphone Extension cable

OutlineMicrophone can be used away from main unit of sound level meter by connecting exclusive coaxial extension cable. Using exclusive coaxial cable enables measurement of extension and moving the measurement place easier with small-type code reel.

Illustration (AG-2000 series Microphone Extension cable)


・ MI-0301 Microphone holder is a standard accessory of each extension cable.
・ Conjunction cable (5 m) for connecting to main unit of sound level meter is attached to an extension cable with code reel.
・ Microphone can be used away from main unit of sound level meter by connecting several extension cables.

AG-2010 :10 m
AG-2030 :30 m
AG-2050 :50 m with code reel
AG-2100A :100 m with code reel

AX-501 Output cable

OutlineOutput cable for AC / DC signal output, comparator output, and external control signal input. It is used for the connection to FFT Analyzer, data recorder, PC, and sequencer etc.(2 m)

Illustration (AX-501 Output cable)

AX-5022B RS-232C cable


IF cable for connecting the LA-1441A/4441A and PC (RS-232C connector). (2m)

Illustration (AX-5022 RS-232C cable)

Tripod for sound level meter


Standard tripod for use with sound level meter.

(Airy L100, made by SLIK Corporation)

Photo (Tripod for sound level meter)

PB-7090 AC Adapter


Input voltage : 100 to 240 VAC
Output voltage : 5.9 VDC
Output connector : EIAJ RC-5320A Voltage category 2
Rated output current : 3.5 A
Total length: 3.5 m

* Please specify the input voltage of the adapter with your order; 120 to 240 VAC.

Photo (PB-7080 AC Adapter)

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Outer appearance and specifications are subject to change without prior notice.