912 S
Bedienungsanleitung
Instructions for use
Notice d‘emploi
Istruzoni per l‘uso
Instrucciones de uso
Gebruiksaanwijzing
912 S
The boundary microphone
912 S is a high-quality, pre-
polarized condenser microphone with half-cardioid pick-up
pattern, designed for picking up speech.
Due to its unobtrusive, flat design, it is ideally suited for use on
conference tables, altars and lecterns.
The microphone can be switched on and off via an integrated
membrane switch.
An internal DIP switch bank provides the following operating
modes:
y
y
y
y
On/off (factory preset)
Push-to-talk button (PTT)
Push-to-mute button (PTM)
Permanently switched on
The frequency response curve can be changed via a second DIP
switch bank:
y
y
y
y
Low cut
Low and high boost (factory preset)
Low boost
linear (= frequency response curve of the 912)
The 912 S is available in three different finishes:
y
y
y
912 S BK (black)
912 S WH (white)
Cat. No. 500875
Cat. No. 500876
912 S NX (Nextel non-reflecting gray) Cat. No. 502193
1
Features
y
y
y
y
y
Programmable membrane switch
Programmable frequency response curve
Very unobtrusive due to flat design
Extremely rugged sound inlet basket
Rubber damping plate on base to minimize structure-born
noise
y
Mounting slots for mounting the microphone to table tops,
lecterns, etc.
y
y
Gold-plated XLR connector
Integrated electronics (instead of in-line preamp)
Delivery includes
y
y
y
y
912 S boundary microphone
Pouch
Instructions for use
Warranty Certificate
2
Postioning the microphone
Boundary microphones make use of the pressure effects at a
room boundary and need to be mounted on a flat surface:
Position
Sound result
Comments
Altar or lectern:
Less room resonance Unobtrusive due to
on a sound-reflecting portions or comb filter flat design; no micro-
surface
elements; improved
speech intelligibility
and greater gain
reserves in contrast to
freestanding micro-
phones
phones in the field of
vision
Conference rooms:
lying on the table;
directed towards the freestanding
Less room resonance Microphones must
in contrast to
not be covered by
papers, folders or
similar objects
conference
microphones
participants *)
*) The cardioid pick-up pattern has an opening angle of approx.
130°. Try to position the microphone so that the sound source
(conference participant, speaker or instrument) is located in
this angle area (see polar diagram).
3
Setting the operating mode and frequency
response curve
³
·
DIP switch bank:
(visible when rear side
is open)
³ Operating mode
· Frequency response curve
Position of
Operating
Position of
Frequency
DIP switches mode ³
DIP switches response curve ·
Permanently
switched on (ON)
Low cut, can be
used in all
operating modes
1
2
3
4
1
2
3
4
Push-to-talk
button (PTT)
Low boost
1
1
2
2
3
3
4
4
1
1
2
2
3
3
4
4
Push-to-mute
button (PTM)
Low and high
boost (factory
preset)
On/off (factory
preset)
linear
1
2
3
4
1
2
3
4
4
Operating Mode ³:
y
y
y
y
Permanently switched on:
disables the switch completely, the microphone is
permanently switched on.
Push-to-talk (PTT):
The microphone is switched on as long as the membrane
switch is pressed.
Push-to-mute (PTM):
The microphone is switched off as long as the membrane
switch is pressed.
On/off (factory preset):
turns the switch into push to switch on, push again to switch
off.
Frequency response curve ·:
y
Low cut:
reduces the bass frequencies to minimize structure-born
noise – this switch (1) is independent of the other three DIP
switches and can be used in any of the following conditions
(eg: you can use the low cut as well as the bass boost if
placing the microphone on a small table with a high risk of
structure-born noise).
y
Low boost:
extends the bass response to compensate for putting the
microphone on a small table.
y
y
Low and high boost (factory preset):
extends the frequency response at both ends.
Linear:
is the natural response of the microphone.
5
Polar diagram
6
Frequency response curve
dBv
- 30
- 40
- 50
- 60
- 70
- 80
20
50
100 200
500 1000 2000 5000 10000 20000 Hz
Low and high boost (factory preset)
Rumble filter (low cut)
dBv
- 30
- 40
- 50
- 60
- 70
- 80
20
50
100 200
500 1000 2000 5000 10000 20000 Hz
Linear ( 912)
Low boost
7
Specifications
Transducer principle
pre-polarized condenser
microphone
Frequency response
Pick-up pattern
20 – 20,000 Hz
half-cardioid
Sensitivity (free field, no load)
(1 kHz)
6 mV/Pa (factory preset)
10 mV/Pa (lin)
Nominal impedance (1 kHz)
Min. terminating impedance
Phantom powering
<100 Ω
1 kΩ
48 V/2.8 mA
Max. sound pressure level (1 kHz) 134 dB SPL
Connector
Weight
XLR-3
550 g
Dimensions
L: 126.5 mm
W: 105 mm
H: 26.5 mm
Pin assignment of XLR-3 connector
+
+
+
+
1
2
2
1
2
1
3
3
3
XLR
XLR
XLR
8
Overview of microphone applications
Variant
Application
Vocals
x
Choirs
x
x
x
x
Studio, acoustic
instruments
x
Orchestra
x
Trumpet, trombone
Saxophone
x
x
x
x
x
x
Acoustic guitar
Acoustic bass
Guitar amplifiers
Bass amplifiers
Leslie
x
x
x
x
x
x
x
x
x
Piano, grand piano
Kick drums
x
x
x
x
Snare drums
Rack toms
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Floor toms
Congas
Cymbals
x
x
Percussion
x
x
x
x
Conference table,
altar
x
x
Lectern
x
x
x
x
Theater stage
9
Manufacturer Declarations
Warranty
2 years
CE Declaration of Conformity
Sennheiser electronic GmbH & Co. KG declare that this
device is in compliance with the applicable CE
standards and regulations.
WEEE Declaration
Please dispose of this product by bringing it to your
local collection point or recycling centre for such
equipment.
10
Sennheiser electronic GmbH & Co. KG
30900 Wedemark, Germany
Phone +49 (5130) 600 0
Fax +49 (5130) 600 300
Printed in Germany
Publ. 09/07
516585/A03
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