Microtech Gefell KEM 975 User manual

KEM 975
Cardioid-Plane-
Microphone
with non-rotatinal symmetrical directivity
Manual
M.EN 201180.01
Date of issue: 31.08.2016
User Manual

Adress Microtech Gefell GmbH
Georg-Neumann-Platz
07926 Gefell
Germany
Telephone [phone]
Fax [phone]
Internet www.microtechgefell.de
E-Mail [e-mail]
2 M.EN 201180.01
Address

Operating elements
KEM 975
On/Off
switch for
LED-light
socket for
delta capsule
4-pole
connector for
delta capsule
LED-light
XLR5M-
connection
microphone holder
MH 975
Power supply N 975
rotary switch
GAIN
on/off
switch
OUTPUT PIN1
switch
XLR3M-
connection
XLR5F-
connection
safety
switch
power
supply
line
level
meter
M.EN 201180.01 3
on/off
switch for
LED indicator
4-pole
connector for
Delta capsule
LED indicator
socket for
Delta capsule
microphone holder
MH 975
XLR-5M
connector
IEC mains
connector
fuse holder / voltage
change switch
OUTPUT PIN 1
switch (earth lift)
XLR-3M
output
connector
XLR-5F
microphone
input
connector
rotary switch
GAIN
level
meter
on/off
switch

Rackmount kit
front panel
connector
housingrack
adapter rack
adapter
4 M.EN 201180.01
rack
adaptor
“ear”
joining
connector
blank panel
rack
adaptor
“ear”

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M.EN 201180.01
Contents
1 Technical specifications 07
2 Delivery 08
3 Accessories 09
4 About this manual 10
5 General Safety Instructions 10
5.1 Danger and information signs . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 Normal Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3 Unauthorised Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Intended Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Initial Steps 11
6.1 Setting up the equipment .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11
6.1.1 Setting up the KEM 975 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1.2 Setting up the N 975 power supply . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2 Installing the rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11
6.2.1 Installing the N 975 into a half-19” Rack . . . . . . . . . . . . . . . . . . . . . 12
6.2.2 Installing the 19” Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.3 Connecting the equipment .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13
6.4 Aligning the microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13
6.5 Disassembling and storing the microphone.. . . . . . . . . . . . . . . . . . . . . . .. 14
6.5.1 Storage at the venue . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 14
6.5.2 Storage in the transport case ... . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Individual settings 14
7.1 Setting the supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 14
7.2 Setting the level ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.3 Setting grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Use of the accessories 16
8.1 Using the DM 21 Delta capsule .. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16
8.1.1 Installing the DM 21 Delta capsule . . . . . . . . . . . . . . . . . . . . . . . . 16
8.1.2 Removing the DM 21 Delta capsule .. . . . . . . . . . . . . . . . . . . . . . 17
8.2 Using a microphone stand .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 17
8.3 Using the KH 975.1 or KH 975.03 anti-vibration mount . . . . . . . . . . . . . . . . . . 17
8.3.1 Installing the KH 975.1 or KH 975.03 anti-vibration mount . . . . . . . . . . .. 17
8.3.2 Removing the KH 975.1 or KH 975.03 anti-vibration mount . . . . . . . . . .. 18
8.4 Using the MA 975 auditorium hanger . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.4.1 Installing the MA 975 auditorium hanger . . . . . . . . . . . . . . . . . . ... 19
8.4.2 Removing the MA 975 auditorium hanger . . . . . . . . . ... . . . . . . . . . 19
9 Cleaning and Maintenance 19
9.1 Cleaning . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .. 19
9.2 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
M.EN 201180.01
5

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M.EN 201180.01
10 Guarantee 20
11 Disposal of old equipment 21
6

1 Technical specifications
Cardioid-Plane-Microphone KEM 975
Poar pattern horizontal super cardioid
vertical club shaped
Recording angle horizontal 120 Grad
vertical 30 Grad
Acoustic operating principle Pressure gradient
transducer
Frequency range 40 bis 18000 Hz
Sensitivity 775 mV/Pa
at 1 kHz, Gain 0 dB
Rated impedance 40 Ohm
Equivalent loudness level CCIR 468-4 24 dB
DIN EN 60268-4 15 dB(A)
Max. SPL for THD 0,5 Gain 12 dB 104 dB
Gain 0 dB 116 dB
Gain -12 dB 128 dB
Gain -24 dB 140 dB
Gain -36 dB 152 dB
Connecting plugs Neutrik XLR5M
Weight 1,07 kg
Length 343 mm
Diameter Mesh 38 mm
Gain 25 mm
Finish nickel matt,
dunkel bronze
Power supply N 975
Power supply voltage 230/115 V AC
±10%, 50/60 Hz
Connecting plugs KEM 975 XLR5F
Audiosignal XLR3M
Weight 1,6 kg
Width 221 mm
Depth 170 mm
Height 45 mm
M.EN 201180.01 7
Polar pattern
Output connector
Neutrik XLR-5M
120º
30º
40 - 18,000 Hz
40 Ω
Housing
Connectors
Audio output
XLR-5F
XLR-3M
satin nickel
dark bronze
Connectors
Connectors
Output connector

2 Delivery
Cardioid-Plane-Microphone KEM 975
Microphone holder MH 975
Power supply N 975
Connection cable (10 m) C 975.1
Main cable
Rack mounting set
Reducing nut 5/8” on 3/8” or 1/2”
Tommy-screw 8 mm for MH 975
Socket wrench 8 mm for MH 975
Suitcase 450 x 160 x 365 mm
satin nickel Order-No. 211180
dark bronze Order-No. 211181
Prior to each use of the microphone make sure that all the parts are in a perfect condition. We also rec-
ommend to inspect the device for residual dust at appropriate intervals and to have the Microtech Gefell GmbH
examine it, if necessary.
8 M.EN 201180.01
IEC mains cable
Thread adaptor: ⅝” male to ⅜” & ½” female
8mm Allen key for MH 975
Transit case 450 x 160 x 365 mm
Prior to each use of the microphone make sure that all parts are in perfect condition.
We also recommend that the microphone is inspected for residual dust at appropriate intervals and to have
Microtech Gefell GmbH examine it, if necessary.

3 Accessories
Microphone connection cable 10 m C975.1 Order-No. 202224
Microphone connection cable 20 m C975.2 Order-No. 202225
Microphone connection cable 30 m C975.3 Order-No. 202226
Microphone connection cable with angle plug 10 m C975.1 W Order-No. 202227
Delta-Capsule DM 21
satin nickel Order-No. 201246
dark bronze Order-No. 201247
Cone holder for elastic-stationary fixing KH 975.03
Reducing nut 5/8” on M10
nickel matt Order-No. 202374
dunkel bronze Order-No. 202375
Cone holder for elastic-stationary fixing KH 975.1
Reducing nut 5/8” auf M10
satin nickel Order-No. 202376
dark bronze Order-No. 202377
Microphone hanger MA 975
1x Microphone holder MH 975
2x Reducing nut 5/8” on M6
2x Ring screw M6
Tommy-screw und socket wrench 8 mm
satin nickel Order-No. 202380
dark bronze Order-No. 202381
Prior to each use of the microphone make sure that all the parts are in a perfect condition. We also recommend
to inspect the device for residual dust at appropriate intervals and to have the Microtech Gefell GmbH examine
it, if necessary.
M.EN 201180.01 9
Microphone connection cable with rt.angled plug 10m
satin nickel
dark bronze
Anti-vibration mount for permanent fixing - 10cm
Thread adaptor ⅝” to M10
Anti-vibration mount for permanent fixing - 3cm
Thread adaptor ⅝” to M10
Auditorium hanger
2 x Thread adaptor ⅝” to M6
2 x Ring screw M6
Tommy-screw and Allen key 8mm
Prior to each use of the microphone make sure that all parts are in perfect condition.
We also recommend that the microphone is inspected for dust at appropriate intervals and to have
Microtech Gefell GmbH examine it, if necessary.

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M.EN 201180.01
4 About this manual
Please read this User Manual carefully before use
to minimise the risk of physical injury or damage to
property or to the equipment.
Keep this User Manual handy during installation
and store it in a safe place in case it is needed by a
user at a later date. If you are an installation
company, please make sure this Manual is passed
on to the customer on completion of the installation.
Please pass this User Manual on to any subsequent
owners to ensure safe use of the product.
5 General Safety Instructions
5.1 Danger and information signs
5.2 Normal Use
The KEM 975 is a line array microphone with the
main sound input direction perpendicular to the
front of the microphone. It is not a rotationally
symmetric polar-pattern, but a cardioid pattern at
rt.angles to the microphone and a narrow 30 !angle
in the other direction.
The microphone serves to capture one or more
sound sources from a spatially extended area.
It is designed for indoor use and, with the
corresponding accessories, for temporary outdoor
use.
5.3Unauthorised Use
This product should not be used by children or
persons with impaired physical, sensory or mental
abilities; nor by persons who have a lack of
experience, unless they are being supervised.
5.4Intended Use
Do not expose yourself to extreme noise levels

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M.EN 201180.01
6 Initial Steps
6.1 Setting up the equipment
6.1.1 Setting up the KEM 975
1. Loosen the adjustment screw on the MH975
microphone holder..
2. Align the threaded connector of the MH975
as desired. .
3. Re-tighten the adjustment screw (after
tightening, the lever can be lifted and turned
so it does not obstruct). .
4. Screw the microphone with the MH975
microphone holder on to the desired mount
(see section 8: Use of accessories).
6.1.1 Setting up the N 975 power supply
1. Install the power supply in a well-ventilated
dry place. .
2. Install it so that it is protected from being
knocked or dropped.
6.2 Installing the rack
The dimensions of the N 975 correspond to the 19”
rack mounting standard for mounting in a standard
rack or a built-in cupboard. The N 975 is half-width,
so it can be mounted in a half-width rack, or two can
be mounted side-by-side in a standard rack with the
supplied rack ears. If a single N 975 needs to be
mounted in a standard 19” rack, use the supplied
blanking panel in the place of the second N 975.
Place the microphone and the power supply unit
in such a way that they are protected from being
trodden on or falling down.
Ensure that the cables are not strained through
tension.
Do not use the microphone or power supply after
they have been dropped.
Repairs should only be carried out by the
Microtech Gefell GmbH Service Department.
Place the microphone and power supply unit in a
way that they are protected from being trodden on
or dropped.
Intense and/or permanent heat exposure will
destroy the microphone. Therefore, do not place
it in locations with direct sunlight or near radiators
or spotlights.
When using the adjustment screw as a clamping
screw without the Tommy Bar, it must be
loosened or tightened with an 8mm Allen Key.
M.EN 201180.01
11

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M.EN 201180.01
6.2.1 Installing the N 975 into a half-19” Rack
1. Remove the screws on the left and right of
the front panel of the N 975 (see diagram
below).
2. Attach the left and right rack “ears” to the
front panel of the N 975, they positively
click into place, and screw them tightly in
place.
3. Slide the pre-assembled power supply unit
into the rack and screw it securely in place
(if necessary, read the instructions supplied
with the rack).
6.2.2 Installing the N 975 into a 19” Rack
1. Remove the screws on the left and right of
the front panel of the N 975.
2. Attach one of the rack “ears” to one side of
the N 975, it will positively click into place,
and screw it tight.
3. Attach the other rack “ear” to the blank
panel, it will positively click into place, and
screw it tight (if mounting two N 975
together, substitute the second N 975 in
place of the blank panel after removing the
left and right screws as described in 1.
above).
4. Place the joining connector on the other
end of the blank panel (or second N 975)
and screw it tight.
5. Place the pre-assembled blank panel (or
second N 975) with the joining connector to
the desired side of the N 975 (the blank
panel can be mounted either side) and
screw it tight.
If there are devices that get hot installed in the
same rack or cupboard as the N 975, the N 975
is at risk of damage. Therefore sufficient
ventilation must be provided to ensure a free air-
flow to keep the devices cool.
The front panel always includes 4 screws
(matched to the rack or cabinet) and 4 washers.
In case of an insufficient mounting depth of the
rack, there is the risk that the connectors at the
rear of the N 975 could be damaged or bent. For
this reason pay close attention to the mounting
depth and allow sufficient space for the
connectors and cables.
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M.EN 201180.01
6. Slide the pre-assembled power supply unit
into the rack and screw it securely in place
(if necessary, read the instructions supplied
with the rack).
6.3 Connecting the equipment
1. Plug the XLR-5F connector of the
microphone cable into the XLR-5M
connector of the microphone until the
connector clicks audibly into place.
2. Plug the XLR-5M connector at the other
end of the microphone cable into the XLR-
5F input connector of the N 975 power
supply until it clicks audibly into place.
4. Plug the XLR-3F connector of the
connection cable into the XLR-3M output
connector of the N 975 power supply until it
clicks audibly into place. Plug the XLR-3M
connector at the other end of the
connection cable into the XLR-3F input
connector of the downstream equipment
(eg: mixer, recorder, amplifier, etc.) until it
clicks audibly into place. .
5. Only after the above connections have
been made, connect the power cable into
the IEC mains connector of the N 975 and
then into the mains power socket (switch on
the power at this socket if it is a switched
socket).
6. Switch on the N 975 power supply with the
on/off power switch.
6.4 Aligning the microphone
Behind the mesh of the KEM 975 is a green
indicator LED.
1. Turn on the LED with the switch on the top
cover of the KEM 975 microphone.
2. Aim the microphone so that the LED can be
seen in the area to be covered. Best results
are obtained when care is taken in the
correct alignment of the microphone.
3. Turn off the LED (optionally, it can be left
on if people to be recorded wish to be
assured that they are in the pick-up area).
The light on the power switch lights up when the
power supply unit is powered up.
The N 975 power supply unit and the KEM 975
can warm up to approx. 35º C, this corresponds
to the normal operating temperature.
The device can be damaged or destroyed if
connected to the incorrect mains voltage.
Therefore please make sure that the N 975 power
supply is set to the correct voltage for the country
of use (see section 7.1: Setting the supply
voltage).
If the amplification is set too high, there is the risk
that the following equipment connected to the
N 975 power supply unit will be destroyed.
Therefore always set the rotary GAIN control to
-36dB, before switching on the N 975.
It is important that the cables are installed safely
and are not twisted nor crushed; also, they should
be protected from being pulled or stretched if
attached to moving parts.
M.EN 201180.01
13

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M.EN 201180.01
The microphone is now ready for use.
NB: When setting up, it is useful to be aware of the
microphone’s polar-pattern.
For instance, if it’s being used to record a choir
behind an orchestra, then the lower edge should
pick up the front row of the choir and miss the back
row of the orchestra – the top edge should pick up
the back row of the choir and miss picking up any
reflections from any wall behind the choir. Mounting
higher and tilting down more may help in this case.
For use as a video conferencing microphone, be
aware of any possible reflections from the table
and/or ceiling and angle the microphone
accordingly.
If used on the edge of a stage, tilting up slightly will
improve the capture of the players and minimise
foot noise on the stage.
Care taken in setting up will give the best results.
6.5 Disassembling and storing the microphone
6.5.1 Storage at the venue
1. Turn off the N 975 power supply with the
on/off mains switch.
6.5.2 Storage in the transport case
1. Turn off the N 975 power supply with the
on/off mains switch. .
2. Remove the mains cable from the power
socket and then from the N 975. .
3. Unlatch the XLR-3F connector of the
connection cable and unplug it from the
XLR-3M output connector of the N 975.
4. Unlatch the XLR-3M connector of the
connection cable and unplug it from the
XLR-3F connector of the downstream
device.
5. Press the PUSH button on the XLR-5F
connection of the N 975 power supply and
pull the XLR-5M connector of the
microphone cable out of the socket at the
same time. .
6. Press the release button of the XLR-5F
connector of the microphone cable and pull
it out of the attached XLR-5M connector of
the microphone. .
7. Place the microphone and power supply
unit into the designated recesses of the
transport case. .
8. If the installation was a temporary one, also
store the cables in the cable area of the
transport case – NB: take care in coiling the
cables so they do not get twisted or
damaged while being wound up.
7 Individual settings
7.1 Setting the supply voltage
The N 975 is delivered as standard, set for a mains
supply voltage of 230V. The operating voltage can
be seen by looking at the small window in the fuse
module. The voltage setting will need to be changed
if your country uses a different supply voltage. The
voltage change switch is part of the fuse holder next
to the IEC mains connector on the back of the
N 975. You will need a flat-headed screwdriver to
open the fuse holder.
Package the KEM 975, N 975 and accessories in
the transport case they were supplied in – this
protects them from shock and damage. Store the
case in a dry and ventilated place.
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M.EN 201180.01
1. Carefully open the fuse holder cover with a
screwdriver (see diagram).
2. Remove the module and the white plastic
fuse holder. .
At the back of the white plastic fuse holder
are the voltage indicators (230V / 115V).
3. Turn the fuse holder over (see diagram)
and re-insert it into the module so that the
correct voltage is visible from outside,
showing through the window of the module.
4. Re-insert the module carefully until it clicks
into place. ..
The N 975 will now operate only on the new voltage.
7.2 Setting the level ranges
With the 5-stage rotary GAIN switch, the
amplification can be adjusted in steps of 12dB
between -36dB and +12dB.
1. Set the KEM 975 up and do a test
recording. The sound pressure level at the
microphone should correspond to the
operating level of the event. Watch the
peaks and leave enough headroom so you
don’t have to re-adjust levels during
recording or transmission. .
2. Set the rotary GAIN control on the N 975 so
that the correct level is sent to the following
equipment.
7.3 Setting grounding
The N 975 power supply is delivered as standard
with pin-1 of the XLR-3M OUTPUT socket
connected to GROUND. This means that the
microphone ground (KEM 975 and N 975) is
connected to the ground of the downstream device.
Depending on the grounding of the following
devices, so-called “ground loops” can develop. If
this happens it is possible to disconnect the
grounding between the N 975 and the following
devices.
Incorrect opening of the fuse holder / voltage
change switch can cause damage, be very
careful when opening it. It is important that you
read the following instructions before you start. If
any damage does occur to the N 975, send it to
Microtech Gefell GmbH for repair (your local
Microtech Gefell distributor can help you with
this).
If the amplification is set too high, there is the risk
that the following equipment connected to the
N 975 power supply unit will be destroyed.
Therefore always set the rotary GAIN control to
-36dB, before switching on the N 975.
If the red LEDs of the N 975’s level meter are
flashing. The microphone is overmodulated and
is sending a distorted signal to the output
(OUTPUT). If this happens, reduce the GAIN
setting of the N 975.
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M.EN 201180.01
1. Slide the earth lift switch (OUTPUT PIN 1)
on the back of the N 975 to the FLOAT
position. This disconnects pin-1 of the
XLR-3M OUTPUT connector from system
ground.
8Use of the accessories
8.1 Using the DM 21 Delta capsule
Below about 800Hz the KEM 975 cannot maintain
its tight directivity in the vertical plane anymore, due
to the length of the microphone, and more and more
approaches a cardioid polar-pattern with lowering
frequencies. The DM 21 Delta capsule, which forms
an equilateral triangle together with the two outer
capsules of the KEM 975, causes an increase in
directivity below about 800Hz to compensate for
this. With the DM 21 Delta capsule the KEM 975
maintains its vertical directivity at approx. 9dB with
low frequencies to below 100Hz.
8.1.1 Installing the DM 21 Delta capsule
1. Turn off the microphone by switching off the
N 975 power supply (or install the Delta
capsule before commencing the system
installation).
2. Remove the protective screw caps from the
rear sockets of the KEM 975 microphone
and store them in a safe place. .
3. Place the KEM 975 microphone and DM 21
Delta capsule in such a way that they are
protected against being dropped. The 4-pin
plug is the top end of the DM 21 Delta
capsule and the guide socket (coloured
red) is at the bottom, closest to the
connector end of the KEM 975. .
4. First, insert the guide pin half-way into the
guide socket (coloured red) on the
KEM 975. .
5. Next, carefully slide the 4-pin connector
into it’s socket on the KEM 975. .
6. Then, push the guide pin fully into the guide
socket and screw it in tight. .
7. Lastly, screw tight the 4-pin connector into
its socket.
The KEM 975 with attached DM 21 Delta capsule is
now ready for use.
Only use genuine Microtech Gefell GmbH
accessories with the KEM 975 system.
• The DM 21 Delta capsule is recognised
immediately after plugging in and the
signal processing for this is adjusted
accordingly.
• With a connected Delta capsule, the
sensitivity of the KEM 975 microphone is
reduced by approx.. 1.0dB.
Delta capsule DM 21
4-pole
connector
guide pin
(gold plated)
Incorrect mounting of the Delta capsule could
damage the connectors and/or sockets. Please
pay special attention to the following steps in
order to avoid this.
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M.EN 201180.01
8.1.2 Removing the DM 21 Delta capsule
Removing the DM 21 Delta capsule is done in the
reverse order of assembly.
1. Turn off the microphone by switching off the
N 975 power supply. .
2. Unplug the XLR-5F microphone cable and
remove the microphone assembly from its
mount.
3. Unscrew the connectors of the DM 21 Delta
capsule.
4. Firstly, unplug the 4-pin connector from the
KEM 975 (this is the top connector of the
Delta capsule) and, secondly, unplug the
guide pin from its socket. .
5. Replace the protective screw dust caps
onto the empty sockets of the KEM 975.
8.2 Using a microphone stand
The KEM 975 is delivered with a stand mount that
has a ⅝” US thread, together with an integral thread
adaptor for the ½” and ⅜” international standards.
The thread adaptor has a ½” thread one end and
⅜” at the other so, if required, just unscrew the
adaptor and insert it the other way around for the
other thread.
In Europe the ⅜” thread is the standard, though
large stands often have the ½” thread. In the USA,
the ⅝” thread is normally the one used.
Camera tripods normally have a small ¼” thread
and thread adaptors are commonly available to
convert this small ¼” thread to the standard ⅜”
thread. However, we would not advise using a
camera tripod for mounting the KEM 975.
8.3 Using the KH 975.1 or KH 975.03 anti-
vibration mount
With these mounts you can attach the KEM 975
microphone to a wall or ceiling. These are
elasticated to minimise the transmission of
structure-born noise to the microphone.
For fitting, you will need a 14mm flat-headed
screwdriver and the supplied 8mm Allen key.
8.3.1 Installing the KH 975.1 or KH 975.03 anti-
vibration mount
1. Using the base of the KH 975.01 (.03) as a
template, mark the wall or ceiling with the
four mounting hole positions. .
2. Drill the mounting holes (suitable for the
ø 5mm screws supplied) into the wall or
ceiling – NB: make sure the surface is solid
and will take the weight of the microphone
and, if using wall plugs, make sure the
correct ones are used and that the fixing
will be firm and cannot be pulled out.
3. Remove the ⅝” to ½” & ⅜” thread adaptor
that was supplied with the MH 975
microphone holder from it and replace it
with the ⅝” to M10 thread adaptor that is
supplied with the KH 975.1 (.03). .
4. The microphone holder base sits inside the
top of the cone – screw it in tight from the
bottom of the mount using the supplied
8mm Allen key. .
5. Screw the KH 975.1 (.03) securely to the
wall or ceiling using the supplied ø 5mm
screws and make sure it is firm. As the
microphone holder cannot be turned once
installed, take care that it is aligned
correctly before screwing the mount to the
wall or ceiling. .
thread adaptor
socket screw
Cone (3cm or
10cm long)
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6. Lastly, insert the KEM 975 into the
microphone holder, align it correctly and
tighten the swivel with the lever on the
MH 975. Once screwed tight, the lever can
be lifted and turned so that it is out of the
way.
8.3.2 Removing the KH 975.1 or KH 975.03 anti-
vibration mount
1. Unplug the KEM 975 and remove it from
the MH 975 microphone holder. .
2. Unscrew the KH 975.1 (.03) from the wall
or ceiling. .
3. Using the 8mm Allen key, unscrew the MH
975 microphone holder and remove it from
the mount. .
4. Remove the M10 thread adaptor from the
microphone holder and screw it back into
the KH 975.1 (.03). .
5. Replace the original (½” & ⅜”) thread
adaptor back into the MH 975 microphone
holder.
6. Do not lose the ø 5mm mounting screws in
case the KH 971.1 (.03) needs to be used
again.
8.4 Using the MA 975 auditorium hanger
The MA 975 auditorium hanger is designed
exclusively for mounting the KEM 975, with or
without the DM 21 Delta capsule attached, and can
be used indoors or outdoors.
Please pay particular attention to the following
warnings for the safe use of the MA 975 auditorium
hanger.
• Only use properly tested and sufficiently
dimensioned slings, ropes and chains.
• Observe the bearing capacity and the
permissible gross bearing weight of the
auditorium ceiling and make sure that the
weight of the microphone and all
mounting accessories, including cables,
are within this weight limit; obeying any
local regulations for the prevention of
accidents.
• Secure the microphone and all
suspension elements properly, making
sure that they cannot fall and are
supported with a safety chain. .
• Make sure that all connections are fully
tight and secure and cannot come loose.
• Don’t use ropes from natural or synthetic
fibres for the catenary..
• Don’t use coated chains for the catenary.
• For load-bearing parts don’t use rope
connections with wire rope clamps. .
• Inspect the mounting elements and
accessories prior to each use and
replace defective parts if necessary. For
permanent installations the hanging
system should be inspected on a regular
basis – this is very important if the
microphone is slung over an audience.
• Make sure that the catenary cannot
become twisted or knotted. .
• Lay the cables in such a way that there is
no tripping risk and highlight any cables
that are run across a walkway. .
• Make sure that the microphone cable is
installed so that it is not part of the load-
bearing catenary and is not strained in
any way (longer length microphone
cables are available for this use). .
• Use the auditorium hanger only with
stages that are covered by a roof.
• Only mount the microphone with the
parts supplied by Microtech Gefell
GmbH.
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8.4.1 Installing the MA 975 auditorium hanger
1. Remove the thread adaptor from the MH
975 swivel mount that was supplied with
the KEM 975 microphone. .
2. Attach the additional MH 975 to the other
end of the KEM 975, align the two mounts
and tighten them firmly. .
3. Screw the ⅝” to M6 thread adaptors
(supplied as part of the MA 975 auditorium
hanger) into each of the two MH 975
mounts.
4. Screw the ring bolts into each microphone
holder.
You can now attach the KEM 975 with attached MA
975 to the catenary.
8.4.2 Removing the MA 975 auditorium hanger
from the KEM 975
1. Remove the KEM 975 with attached MA
975 from the catenary. .
2. Unscrew the ring bolts from the mounts.
3. Remove the ⅝” to M6 thread adaptor.
4. Remove the second MH 975 mount from
the upper end of the microphone.
5. Store all MA 975 elements together in a
safe place.
9 Cleaning and Maintenance
1.1 Cleaning
1. The KEM 975 and accessories should only be
cleaned with a soft lint-free cloth.
• If used outside and the wind speed rises
to over 8 Bft (65-70 km/h or 40-45 mph),
there is the risk of injury by falling debris.
Get all people away from the danger
zone and lower and dismantle the
microphone suspension.
ring screw
microphone holder
LED indicator
XLR-5M
connector
It is vital that these are screwed together properly
and cannot come loose. For a permanent
installation we would recommend the use of
Loctite®or similar be applied to the thread adaptor
and ring bolt threads to ensure a secure fixing.
Fasten the catenary first to the holder at the
XLR-5M end of the microphone and then to the
second holder at the other end.
Never use chemicals nor aggressive or abrasive
cleaners on the KEM 975 system as these could
scratch or damage the microphone.
Keep the microphone away from all forms of
pollution that could damage the microphone.
If the microphone grill becomes damaged or
blocked in any way please contact the Service
Department at Microtech Gefell GmbH (your local
Microtech Gefell Distributor can help you with
this).
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9.2 Maintenance
Before each use check the microphone and
accessories to make sure that all parts are in
perfect condition. For a permanent installation, the
microphone and accessories should be checked on
a regular basis to ensure that they are in proper
condition and no mounting parts have become
loose. For long term reliable use, Microtech Gefell
GmbH recommends that the microphone be
returned for checking and cleaning after an
appropriate period of time.
10 Guarantee
Microtech Gefell GmbH guarantee products against
manufacturing defects for a period of two years
from first sale (or for one year in the case of a
second-hand item that has been checked and
serviced by Microtech Gefell’s Service Department
before re-sale). In each case, starting from the date
of invoice to the end user. The Guarantee excludes
any defects or damage caused by negligent or
improper treatment or incorrect installation or non-
compliance with the specifications given by
Microtech Gefell GmbH or the technical
specifications specified on the relevant data sheets,
or the use of inappropriate accessories or any
modification of the original parts by the customer or
their contractor, or by any third parties not
commissioned by Microtech Gefell GmbH. Regular
wear and tear is also excluded from the Guarantee.
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