Audio Samples     Each sample is available in 2 different qualities. Most people will want to use the "low" quality samples, as both qualities will sound identical on most computer speakers. If you want to hear the difference, we suggest listening with a pair of headphones. Noise Type Quality Description Chart Pink Noise Hi | Low Pink Noise (14s) Y White Noise Hi | Low White Noise (13s) Y White & Pink Noise Hi | Low First white, then pink noise (27s) Y Sine Sweep 20-20k Hi | Low 20Hz-20kHz sine wave sweep (20s) N Relative SPL 10dB Hi | Low Pink noise @ varied 10dB increments. (23s) N Relative SPL 5dB Hi | Low Pink noise @ varied 5dB increments. (28s) N Relative SPL 3dB Hi | Low Pink noise @ varied 3dB increments. (26s) N Relative SPL 1dB Hi | Low Pink noise @ varied 1dB increments. (27s) N Centrifugal Chiller Hi | Low 1000 Ton Centrifugal Chiller (27s) N Screw Chiller Hi | Low 100 Ton Screw Chiller (27s) N Supply Plenum Fan Hi | Low Supply Plenum Fan, startup (20s) N Mixed Flow Fan Hi | Low Mixed Flow Fan (24s) N