INFRA-QSOURCES-Qdhl

Directional mid frequency volume sound source

An instrumented sound source for transfer measurements within a limited angle of excitation. To achieve high levels of high frequency noise at longer distances this source is purposely made directional.
But, within the limited angle the source is actually behaving as an omni-directional point source.

Features:

• Accurate omni-direct ional point source behaviour within a narrow angle
• Integrated volume acceleration sensors for accurate transfer function measurements.
• Both low weight and compact transport dimensions for efficient field work.

Main specifications*:

Frequency range:                     400-4000 Hz
Measurement angle:                 45 degrees (+/-1 dB up to 3000 Hz)
Maximum levels:                      126 dB at 1 meter in semi-free-field**
Advised distance to reflectors:   minimal 1 meter
Source weight:                        12 kg

Dimensions in transport:           0,7 m * 0,7 m * 0.45 meter
Power requirement:   500 Watt RMS to 8 Ohm (Light weight power amplifier available)‏

*These specifications may be adapted if necessary to improve the quality of the product.
**When excited with band-limited and low crest-factor white noise during two minutes.

Applications:

• Reciprocal airborne transfer function measurements
• Specially suitable for longer distance applications
• In-situ airborne isolation measurements
• Sound barrier performance measurements