Gracey & Associates UK Hire

Bruel & Kjaer 4205 Sound Power Sources

B&K 4205

Reference Sound Power Source

£ 25 a day *

Battery operated reference sound power source for use in A-weighted and octave band sound power measurements using any of the following techniques:

♦  Substitution method ♦  Comparison method ♦  Juxta-position method Sound power level measurements ♦  40 dB to 100 dB in 7 octave bands from 125 Hz upwards and ♦  White or Pink Noise - 100 Hz to 10 kHz.

Manufacturer's Specifications

For much 'louder' sound sources - up to 122 dB SWL see the Nor 250 & 260/280 speaker/amplifier systems in the Building Acoustics section.

If you need a suitable sound level meter - click here for details.


* Our standard hire charges are based on a 4-day minimum period - details and other options.

Gracey & Associates   01933 624212

BSI accreditation for instrument hire and calibration

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