Test Solution for Room Acoustics

Building Acoustics Solutions

The Room Acoustics Kit measures the behavior of acoustic sound in enclosed spaces, such as dwellings, class rooms, auditoriums, offices, theatres, concert halls, or transportation terminals. The kit consists of the DS3 Dodecahedron Speaker set, the XL2 Acoustic Analyzer and the Room Acoustics Reporter software. All measurements are performed in accordance with the relevant standards.

Overview

Room acoustics describes how acoustic sound behaves in an enclosed space. Typical room acoustic measurements are

The acoustic response of the room should fit the primary purpose of the room. For example, for good speech intelligibility in classrooms, a reverberation time RT60 of 0.5 to 1 second based on the volume is desirable. In a concert hall designed for orchestral music, a reverberation time RT60 of 2-3 seconds may offer a rich and warm sound experience. Based on measurements, the acoustic properties of an enclosed space can be modified e.g. by adding sound absorbing materials to walls or ceilings.

Sound Source

Room acoustic measurements require a sound source with a diffuse sound field, which means that the sound energy has to be distributed uniformly. For this reason, a sound source with an omnidirectional radiation characteristic is best used for precise measurements.


DS3 Dodecahedron Speaker Set

DS3 Dodekaeder-Lautsprecher

The DS3 Dodecahedron Speaker is a powerful sound source with omnidirectional radiation characteristics. It includes 12 loudspeakers of the same type, mounted to a dodecahedron-shaped chassis. The optimized frequency spectrum delivers a high level of equalized sound energy for precise Reverberation Time measurements. Additionally, it offers the reference sound source to evaluate the spatial decay rate in open plan offices.

PA3

The DS3 is powered by the portable Power Amplifier PA3, which offers a built-in Pink Noise generator with an equalized output signal. The wireless remote control allows the test signal to be switched on/off from outside of the measurement room.

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TalkBox

TalkBox

The TalkBox is an acoustic signal generator for speech intelligibility measurements. The TalkBox simulates a human talker (60 dBA @ 1 meter) with the STIPA test signal and spoken messages. Further it provides a wide range of test signals like Sine, Pink Noise, White Noise, a delay test signal, and spoken announcements. It offers a balanced Line-In/Out connector and an FIR equalized speaker (level and phase).

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Minirator MR-PRO

MR-PRO

The Minirator MR-PRO generates a gated Pink Noise with a low Crest factor dedicated to RT60 measurements. In addition, the MR-PRO offers the Speech Intelligibility signal and a GlideSweep signal with editable cycle time. All test signals may be replayed via the DS3 Dodecahedron Speaker set.

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XL2 Analyzer for Room Acoustics

XL2

 

Reverberation Time RT60

The XL2 Acoustic Analyzer measures the energy decay in the range from 63 Hz to 8 kHz by the Schroeder method in 1/1 octave bands. Automatic triggering and averaging of multiple measurements simplify the operation and minimizes the measurement time. Use either an impulse source or an interrupted Pink Noise as the test signal. The optional Extended Acoustic Pack extends the RT60 measurement to a 1/3 octave resolution. The measurement result may be compared with the recommended reference values using the optional software «Room Acoustics Reporter».

XL2 RT60 Nachhallzeitmessung

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Speech Intelligibility STI

 

The XL2 Analyzer, with the STIPA Option installed, measures the Speech Intelligibility according to the latest revision (edition 4) of the IEC 60268-16:2011 standard and older editions. It offers ambient noise correction and automated averaging for repeated measurements. The XL2 displays the Speech Transmission Index (STI) and the Common Intelligibility Scale (CIS), accompanied by the individual levels and modulation indices of the seven Octave bands. This allows e.g. to determine the privacy and distraction distance in open plan offices in accordance with ISO 3382-3.

Speech Intelligibility STI

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Sound Pressure Level

The XL2 is a powerful sound level meter for comprehensive room acoustic measurements. It offers a wide range of levels, such as average Leq, maximum or minimum sound pressure level measured in combination with frequency weighting A, C or Z and time weightings fast, slow and optional impulse. All results are simultaneously available.

XL2 Sound Level Meter

Customers may log all acquired level information onto a removable SD card. Additionally, the XL2 offers wav-file recording for a complete documentation of the measured sound pressure levels. Voice notes may also be added to each measurement.

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Background Noise Spectrum

The RTA perfectly suits the sound optimization in rooms. The XL2 measures and logs wideband values and the real time spectrum in 1/1 or 1/3 octave-band resolution according to IEC 61260 class 0. The sound level meter results of the wideband and RTA spectrum are simultaneously available.

XL2 Sound Level Meter

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Noise Curves

The XL2 Acoustic Analyzer provides a Noise Curve measurement for an objective rating of the background noise level in a room. The Noise Curve rating of a spectrum is designated as the value of the highest noise curve “touched” by the measured octave-band spectrum. The Speech Interference Level (SIL) and the Noise Curve rating are calculated in parallel. The Noise Curve function is offered with the Spectral Limits Option.

XL2 Sound Level Meter

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Room Acoustics Reporter

The XL2 Acoustic Analyzer saves the acquired measurement data on its SD card. The data contains all relevant information formatted as a text file so it can be easily imported into any spreadsheet program such as MS Excel or the professional Room Acoustics Reporter software.

Projector PRO XL View

The Room Acoustics Reporter is a PC software for automatically generating reverberation time measurement reports and analyzing the RTA frequency response spectrum. The software supports acousticians and experts in the visualization and detailed evaluation of measurement data recorded with the XL2 Sound Level Meter.

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Configurations

XL2 Building Acoustics Kit

XL2 Measurement Kit for Basic Room Acoustics

including
  • XL2 Acoustic Analyzer
  • Extended Acoustic Pack for XL2
  • M4261 Measurement Microphone
  • Minirator MR-PRO
  • ASD Cable for XL2
  • 2x Mains Power Adapter
  • Exel System Case
 

XL2 Measurement Kit for Professional Room Acoustics

including
  • PA3 Power Amplifier
    with built-in noise generator
  • DS3 Dodecahedron Speaker
  • Speaker Stand for DS3
  • XL2 Acoustic Analyzer
  • Extended Acoustic Pack for XL2
  • M2230 Measurement Microphone
  • ASD Cable for XL2
  • Mains Power Adapter
  • Exel System Case

Optional as required:
 

Speech Intelligibility Option for XL2

for STI measurements

Spectral Limits Option for XL2

for noise curve measurements

TalkBox

Acoustic Generator

Class 1 Sound Calibrator

for microphone calibration to actual environmental conditions

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