SERVICE MANUAL
Published by Sony Techno Create Corporation
Sony Corporation
Audio Business Group
SPECIFICATIONS
ELECTRET CONDENSER
STEREO MICROPHONE
9-887-969-01
2008A04-1
©
2008.01
US Model
Canadian Model
Ver. 1.0 2008.01
ECM-957PRO
General
Type
One-point stereo (employing the Mid-side stereo
system), electret condenser microphone
Microphone cord
4mm diameter, two core-shielded OFC (Oxygen-free
copper) cord with Canon XLR-5-12C type connector
and gold plated L-shaped stereo miniplug
Stand screw
PF
1
/
2
screw
Dimensions Approx.
40
×
183mm (diameter
×
length) (1
5
/
8
×
7
1
/
4
in.), projecting parts and controls not included.
Mass
Approx. 330 g (11.7 oz.) including battery and cord
Supplied accessories Wind screen (1)
Microphone holder (PF
1
/
2
screw) (1)
Microphone stand (1)
Carrying case (1)
Performance
Frequency respone 50 – 18,000 Hz
Directivity Unidirectional
× 2
(Directive angel: 90
° or 120°)
(switchable)
Output impedance
600 ohm ± 30% unbalanced
Sensitivity (directive angle 120
°)
Open circuit output voltage
∗
1
: –37
± 3 dB
Effective output level
∗
2
: –40.8
± 3 dBm
Difference between L and R channel sensitivity: Less
than 3 dB
Power requirements Normal operating voltage: 1.5 V , R6 (Size AA)
battery
Minimum operating voltage: 1.1V , R6 (Size AA)
battery
Battery life: Approx. 200 hours with Sony R6P (SR)
battery
Maximum sound pressure level input
∗
3
More than 120 dB
SPL
Dynamic range
More than 95 dB
Operating temperature range
0
°C – 40°C (32°F – 104°F)
∗
1
0 dB = 1 v / Pa, 1,000 Hz (1 Pa = 10
μ
bar = 94 dB
SPL
)
∗
2
0 dBm = 1 mW / Pa, 1,000 Hz
∗
3
1% wave distortion at 1,000 Hz. (0 dB
SPL
= 2
×
10
3
Pa)
Design and specifi cations are subject to change without notice.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
FEATURES
This microphone is suitable for use in a variety of situations such as at
concerts or conferences with digital recording equipment (Sony DAT, MD,
NT (Digital Microcorder) ICD, etc.).
• The turning capsule function allows both vertical and horizontal
sound pick-up.
• The Mid-Side Stereo System provides a natural sound pick up,
delivering a stereo sound image with superb clarity.
• The directive angle (between left and right channels) can be set
to
90
° or 120° according to the sound source.
