ST450 MKII Owners Manual

SoundField ST450
User Guide
Technical Specification
Page 20
TECHNICAL SPECIFICATION
SPECIFICATIONS (+/- 1dB)
Microphone acoustic line up at 0dB gain - - - 80dB SPL
Maximum input for less than 0.5% THD - - - 135dB SPL
Frequency range - - - - - - 20Hz - 20kHz
Frequency range with 100Hz Hi Pass Filter - - - 100Hz - 20kHz
Equivalent self noise, IEC 179 (cardioid) - - - 13dB - A SPL
Control Unit outputs at line up - - - - 0dBu, Balanced
Maximum output levels - - - - - +22dBu
Minimum loads:
Stereo and B-Format outputs - - - 600 ohms
Headphones - - - - - 400 ohms/side
Output impedance - - - - - - 100 ohms balanced
Powering - - - - - - DC9 / 18V (7W)
*All specifications are subject to change without prior notice.
Humidity and Condensation
Condensation which is caused by rapid changes in humidity and cold, damp conditions can be a
problem to ALL polarised condenser microphones. Moisture from the atmosphere or from the breath,
if used close to the mouth, may condense on the capsules resulting in noise and reduced signal. The
ST450 microphone includes a heater in the capsule cluster to minimise this effect and normal
performance is restored when this moisture has completely evaporated. The heater is operational
when powered by both battery and mains electricity. It is therefore advisable when the microphone
has been stored in a cold place, such as in a vehicle overnight, to bring the microphone into a warm
dry environment prior to use and full performance will be achieved more quickly. For outdoor use it
is desirable - and in many cases essential - to use a shockmounted windshield such
as Rycote.