Product Description
The PG81 is a high quality unidirectional condenser microphone designed for studio recording, broadcasting and sound reinforcement. Wide frequency response and low noise characteristics, as well as low RF sensitivity make it a standard accessory for general instrumentation, especially for guitar, piano and cymbal applications.
The main function:
The structure of the SM81 is very strong. It can be powered by phantom power and can operate in a wide range of temperature and humidity environments. It is equipped with a rotary adapter, attenuator switch lock, a foam windshield and a bag for carrying and storing. Other accessories are also available.
0 Hz to 20 kHz frequency response
Can accurately reproduce the smooth response curve of the sound source
Low noise and high output clipping levels
Low distortion characteristics over a large load impedance range
Heart-shaped pickup mode, balanced frequency and axisymmetric, so as to eliminate off-axis sound and reduce interference as much as possible
Low RF sensitivity
Selectable low frequency response: smooth, 6 or 18 dB/octave attenuation
0 dB/10 dB lockable attenuator switch
Phantom power supply (DIN 45 596, voltage 12 to 48 Vdc)
Rugged steel construction is extremely durable
Field application in a wide range of temperature and humidity conditions
Type capacitor (dielectric bias) frequency response 20 to 20,000 Hz
Pickup mode
Heart-shaped (one-way) response ? Frequency equalization, axisymmetric
Output impedance
Rated impedance is 150 ohms (effective impedance is 85 ohms) Recommended minimum load impedance: 800 ohms (allowable load can be as low as 150 ohms as the clipping level drops)
Output configuration and connector
Balanced transformer coupling output; XLR male connector
Sensitivity
(1,000 Hz) open circuit voltage: -45 dBV/Pa (5.6 mV) (1 Pa = 94 dB sound pressure level)
Limiting level
(1,000 Hz) 800 ohm load: -4 dBV (.63 V) 150 ohm load: -15 dBV (.18 V) total harmonic distortion less than 0.5% (131 dB SPL, 250 Hz, 800 ohm load)
*Sound pressure level
(1,000 Hz) 800 ohm load: 136 dB (attenuator at 0) 146 dB (attenuator at -10) 150 ohm load: 128 dB (attenuator at 0) 138 dB (attenuator at -10)
Acoustic pickup
-3 dB equivalent sound pressure level in 1 milliohm field (60 Hz)
Self noise
(Equivalent sound pressure level; measured with a true rms voltmeter) is typically 16 dB, A weight is typically 19 dB, and weights are in accordance with DIN 45 405
Signal to noise ratio
78 dB (IEC 651)*, 94 dB Sound Level* Signal-to-Noise Ratio is the difference between the microphone output at the 94 dB sound level and the microphone's own noise A weight.
Overvoltage and reverse polarity protection
* External voltage applied to pins 2 and 3 (relative to pin 1): +52 Vdc reverse polarity protection: * 200 mA (fixed diode)
polarity
Positive pressure on the diaphragm produces a positive voltage on pin 2 (relative to pin 3)
Microphone head capacitance
54 pF
Low frequency response switch position
Smoothing; -6 dB/octave
