​System Overview

Key Applications

Building Sound Insulation

• Airborne sound insulation between rooms

• Internal wall and partition testing

• Floor and ceiling airborne sound insulation

• Façade and external wall sound insulation

• Door and window sound insulation

• Room-to-room sound isolation

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Impact Sound Insulation​

• Floor impact sound insulation

• Floor-ceiling assembly assessment

• Standard tapping machine measurements

• Rubber impact ball measurements

• Low-frequency impact sound evaluation

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Room Acoustics

• Reverberation time

• Sound decay measurements

• Background noise

• Room-to-room level differences

• Building services noise

• Indoor environmental noise

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Core Advantages

Wireless Measurement Architecture

​Wireless acquisition units allow measurement channels to be positioned in separate rooms without long signal cables.

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This reduces installation time and improves measurement efficiency in occupied buildings and completed construction projects.

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Two-Channel and Four-Channel Configurations

The system is available in flexible two-channel and four-channel versions.

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Multiple wireless measurement units can be connected simultaneously for synchronized measurements at different positions.

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Portable and Field-Ready

​Compact instruments, wireless communication and battery-powered operation make the system suitable for field measurements.

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The complete system can be transported between different rooms, buildings and project sites.

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Integrated Measurement Workflow

The ZX9920 supports the complete architectural acoustics measurement process:

• Source-room sound level measurement

• Receiving-room sound level measurement

• Background-noise correction

• Reverberation-time correction

• Frequency-band analysis

• Single-number rating calculation

• Automated report generation

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Guided Software Operation

The dedicated measurement software provides guided workflows, standardized test procedures and automatic data processing.

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New users can follow step-by-step instructions, while experienced consultants can access advanced measurement and reporting functions.

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Measurement Methods

Guided Software Operation

The system measures sound levels in the source room and receiving room and applies background-noise and reverberation corrections.

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Supported applications include:

• Room-to-room airborne sound insulation

• Wall and partition performance

• Floor and ceiling airborne sound insulation

• Façade sound insulation

• Door and window sound insulation

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Typical reported quantities may include:

• Apparent sound reduction index

• Standardized level difference

• Normalized level difference

• Weighted sound insulation ratings

• Spectrum adaptation terms

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Impact Sound Insulation

The ZX9920 supports standardized floor impact testing using a tapping machine or optional rubber impact ball.

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The measurement system records impact sound levels in the receiving room and applies the required corrections and rating calculations.

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Typical applications include:

• Floor-ceiling assembly testing

• Residential floor impact assessment

• Comparison of floor covering systems

• Evaluation of resilient layers

• Construction quality verification

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Reverberation Time

Reverberation time can be measured using:

• Interrupted-noise method

• Integrated impulse-response method

• MLS-based measurement mode, where permitted by the selected procedure

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The software automatically calculates decay curves and reverberation-time results across the selected frequency range.

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Measurement Methods

Reverberation Time

The system measures sound levels in the source room and receiving room and applies background-noise and reverberation corrections.

​

Supported applications include:

• Room-to-room airborne sound insulation

• Wall and partition performance

• Floor and ceiling airborne sound insulation

• Façade sound insulation

• Door and window sound insulation

​

Typical reported quantities may include:

• Apparent sound reduction index

• Standardized level difference

• Normalized level difference

• Weighted sound insulation ratings

• Spectrum adaptation terms

​

Impact Sound Insulation

The ZX9920 supports standardized floor impact testing using a tapping machine or optional rubber impact ball.

​

The measurement system records impact sound levels in the receiving room and applies the required corrections and rating calculations.

​

Typical applications include:

• Floor-ceiling assembly testing

• Residential floor impact assessment

• Comparison of floor covering systems

• Evaluation of resilient layers

• Construction quality verification

​

Reverberation Time

Reverberation time can be measured using:

• Interrupted-noise method

• Integrated impulse-response method

• MLS-based measurement mode, where permitted by the selected procedure​

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The software automatically calculates decay curves and reverberation-time results across the selected frequency range.

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Advanced MLS Measurement Option

Efficient Measurement in Real-World Conditions

The optional MLS-based measurement mode uses digitally generated test signals and signal processing to obtain room impulse-response and sound decay information.

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Compared with conventional methods, MLS measurement can provide several practical benefits:

• Improved resistance to steady background noise

• Faster room-acoustics measurements

• Improved signal-to-noise ratio

• Reduced source power requirements

• Broader useful measurement range

• Better repeatability in difficult test environments

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MLS measurement is particularly useful for rapid reverberation-time measurements and low-level receiving-room conditions, where permitted by the selected standard and project procedure.

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Standards Support

International Standards

The ZX9920 is designed to support measurements and calculations based on applicable architectural acoustics standards, including:

Field Measurement Methods

ISO 16283-1

Acoustics — Field measurement of sound insulation in buildings and of building elements — Part 1: Airborne sound insulation

ISO 16283-2:2020

Part 2: Impact sound insulation 

ISO 16283-3:2016

Part 3: Façade sound insulation 

ISO 3382-2

 Reverberation time in ordinary rooms

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Rating Standards

ISO 717-1:2020

 Rating of sound insulation in buildings and of building elements — Part 1: Airborne sound insulation

ISO 717-2 / AS ISO 717.2

Supports measurements required for Australian building-acoustics assessment, subject to the applicable NCC edition, project specification and adopted test standard.

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Australian Applications

The ZX9920 can be configured for architectural acoustics measurements according to applicable Australian, adopted ISO and project-specific requirements.

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Typical applications include:

• Residential wall and floor sound insulation

• Apartment separation testing

• Façade sound insulation

• Floor impact sound assessment

• Reverberation-time measurement

• Building code and project acceptance testing

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Typical reported quantities may include:

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Relevant Australian references may include adopted ISO 717 standards and applicable AS or AS/NZS field measurement methods.

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Supports interrupted-noise and integrated-impulse-response measurement methods, depending on the selected standard and software configuration.

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