Low frequency volume sound source

This product was developed to allow accurate measurement of very low frequency isolation (or transfer) of noise, both air-borne and structure-borne.

The Qohl is used both for reciprocal an direct sound field excitation, for source strength identification, contribution analysis and isolation or barrier effectiveness quantification.

The high levels of low frequency noise allow building acoustics, large infrastructure and/or industral site application.

Features:

• Integrated volume acceleration sensors provide accurate information of the source strength
• Point source behaviour with low frequency omni-directionality within ISO 140
• High level of low frequency noise; 118 dB from 35 Hz upwards.
• Both very low weight and compact transport dimensions for efficient field work.

Main specifications*:

* These specifications may be adapted if neccesary to improve the quality ofthe product
** when excited with band-limited and low crest-factor white noise during two minutes
*** see also light weight measurement power amplifier Qam

Applications:

• Buildings, industry, power, road-, railway-infrastructure testing
• Airborne and structure borne applications
• General reciprocal or direct transfer function measurements
• General low frequency air-borne and structure-borne applications