Introducing the Rational Noise Stick

January 13, 2009

We are proud to introduce the first acoustic test and measurement hardware product to be designed and distributed under the Rational Acoustics brand name.

The Rational Noise StickTM, our new phantom powered pink noise generator is a study in simplicity, precision and ruggedness.  Its mission is to do one thing really well and to do it faithfully for years to come.  Plug it into a phantom powered microphone input and it generates pink noise – very nice, well-behaved pink noise.  Unplug it and it stops.  RA_Noise_Stick_Image_2.jpg

The Noise Stick is hand built in the USA exclusively for Rational Acoustics by PMP Audio Works, sparing no detail for quality and reliability. It features such niceties as hand matched transistors, 1% tolerance resistors and a Linear Feedback Shift Register (LFSR) random number generator that provides a pseudorandom signal with excellent statistical properties and without any obvious, audible repeats. The output of the Noise Stick’s random number generator drives a hand tuned filter bank that delivers a pink spectrum that is nominally flat within +/- 0.5 dB from 30 Hz to 20 kHz on a 1/3-octave analyzer.  The frequency response and output level for each unit is tested at both the beginning and end of the burn-in process to ensure that both criteria perform over time without variation. 

The sleek, compact design is unobtrusive and fits easily into mic cases and gear bags. The housing for the Noise Stick is milled from a solid piece of aluminum rod to yield a thicker walled tube than we could have gotten using standard tubing stock.  The entire unit is filled with epoxy after assembly to protect the electronics from shock and increase its crush strength. Prototype test units were found to work just fine after being dropped from two stories onto a concrete surface and run over by a car, although we wouldn’t recommend doing this to yours (on purpose). 

The Noise Stick is available for only $89 USD and is available for purchase at the Rational Acoustics web store ( ) immediately.

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