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The most powerful, lightweight sound source & amplifier for building acoustics: Qsources Qohm & Qam

Check out our latest video for Qsources Qohm and Qam.

Qohm is the ideal sound source for different acoustic measurement situations:
– Room acoustics
– Building isolation testing
– Facade isolation testing
– etc.

This source is extreme lightweight & powerful. Request your demo via our contact form.

Sound source suitability for in-situ noise barrier measurements

KU Leuven (Belgium) & Qsources analysed sound source suitability for in situ noise barrier measurements according to EN 1793-5:2016.

This method aims at optimizing the reliability of field measurements of reflection and scattering on barrier surfaces. Measurements took place at the Laboratory of Acoustics at the Department of Physics and Astronomy of KU Leuven.
Qoms2 (monopole omni-directional source) as well as Qohm (lightweight high output dodecahedron) were measured in comparison with a conventional sound source. During this study the direct sound arrival was analyzed using a microphone grid placed in a large reverberant room. Impulse responses where measured using different settings of the DSP controlled Qam measurement amplifier.

A preliminary analysis showed significant differences between the sound field characteristics of the Qsources devices and the ones of the conventional sound source, indicating a potential advantage of the Qoms2 source.

Other interesting tests such as measurements against surfaces with different absorption characteristics are planned in the near future.
Qsources would like to thank KU Leuven and Prof. Dr. Christ Glorieux for the cooperation.

Determining sound power of fixed machinery

This article investigates how to measure sound emission in an acoustically complex environment by using a reference sound power source.

The reference source method provides fast and low complexity measurements of sound power on-site in arbitrary acoustic environments.
Qsources Qref , a small and lightweight sound power reference source, was used to improve the accuracy of the sound power reference method.

This blogpost was based on an application note and can be read in full via below link.

 Frequency Response Function (FRF) testing

Watch the recent Simcenter on-demand webinar about boosting digitalization in noise and vibration (NVH) product development and see our Simcenter-products being set-up and used.

Simcenter-Qsources Q-MED Low Frequency Monopole source was used for excitation in vibra-acoustic transfer function measurements.

Q-HSH High frequency shaker was used for modal analysis of CAE correlation. This shaker ensures excitation without damaging the surface with low hardness and changing dynamic stiffness of the structure.

Acoustic transfer function measurement executed in this webinar included Q-MHF Mid High Frequency Volume Source. This source was used to artificially generate noise from outside the vehicle.

In this webinar, you will learn how hybrid modeling uses test and CAE data, how FRF test data can help improve CAE models & how acoustic FRFs support vehicle package NVH design.

Acoustic comfort in atria and large halls

This article discusses acoustic comfort in atria and large halls & the effects of transparent foil roofs.
This study was presented by researchers of the Slovak University of Technology in Bratislava in cooperation with KU Leuven faculty of architecture.

The low frequency measurements conducted inside the building of the Berufsbildende Schule in Oldenburg, Germany included In-situ reverberation measurements, Sound pressure level decay
and Numerical analysis using room acoustic software.

Thanks to Monika Rychtarikova, Daniel Urbán, Carl Maywald, Lukáš Zelem, Magdaléna Kaššáková and Christ Glorieux and the team of KU Leuven and STU Bratislava for supporting the use of the article

Challenges of acoustic measurements in performance sites….

In measurement situations where control of sound quality and intelligibility are crucial factors, there can be certain challenges to be taken into account. These type of room acoustic measurements include:

  • Room Impulse Responses
  • Reverberation Time
  • Speech Transfer Measurements

Learn why a monopole sound source outperforms dodecahedron speakers.

Infra-Qsources Equipment Rental

Impress your clients using state-of-the art Infra-Qsources equipment.

Use the most lightweight equipment: no worries taking your equipment on-site & enjoy the easy set-up or simply try the Infra-Qsources sound sources & amplifiers for your project prior to purchase.

Infra-Qsources rental equipment allows you to use specific, “niche” measurement equipment for projects you don’t have to do on a routine basis.

Qsources developed a custom miniature Wind tunnel reference sound source for TU Delft Aeroacoustics & Wind Energy Research Group.

QindW is a custom miniature sound source with very low diffraction and excellent omni-directionality. A narrow and long design allows minimal impact on the flow and minimal feedback from the flow on the source output.

This Low Turbulence Tunnel experiment was part of the NWO-TTW THAMES project: Towards High-Reynolds Airfoil self-noise MEasurementS. The goal was to understand how to improve noise measurements in closed wind tunnels, with particular application to wind turbine blade noise studies. 

Low Frequency Sound Source Q-MED

Q-MED is a low frequency monopole source designed to measure vibro-acoustic transfer functions in and around vehicles.

The negligible diffraction makes it an accurate omnidirectional sound source up to 2,000 Hz. allowing typical vibroacoustic body noise transfer functions measurements including frequency response functions (FRFs).

A recent Siemens Simcenter blogpost provides a step by step approach to obtaining the most accurate results using corrected values for analysis and comparison to avoid influence of the source on the measured FRF.
This article explains how to use the data from the Q-MED calibration report as well as post processing calculations to account for variations of source sensitivity and applying corrections in amplitude.


ISO9001:2015 Certification

Following the audit of SGS, a leading company in inspection, verification, testing and certification, Qsources has successfully gained certification to ISO 9001:2015. The main feature of the ISO 9001 Quality Management system is offering a customer central approach including overall performance improvements and risk-based thinking. We at Qsources are proud to have gained this acknowledgement.

Simcenter Qsources Q-ISH used in modal analysis

A recent Siemens Simcenter blogpost discuses test-calibration of mode shapes. The test set-up includes Qsources Q-ISH integral shaker on the SimRod, a full electric sportscar at Siemens Simcenter. Control of the mode shapes allows modifications to increasing the range of a vehicle and optimizing the drivetrain.

Next to CAE based modal analysis the actual testing supports a balanced development.  However, testing can become expensive. The example of the Simcenter Qsources Q-ISH integral shaker shows that excitation and calculation can be performed in an easy and fast manner. The compact shaker can be attached and positioned easily under any inclination and has a patent protected self-aligning stinger-suspension system. This way the shaker can be mounted directly on the relevant excitation location.

McGill university in Montreal Canada installed a large set of Qohm sources with dedicated equalization equipment.

In the recording research centre at McGill, the very light weight omni-directional sources are used in experiments to influence musicians during their performance recording using replay. And, a set of two of the same Qohm sources are also used when going over the world to investigate the acoustics of large performance sites with exceptional acoustic properties. See the 16 sources suspended over the recording area at McGill in the shown photo.