Klein + Hummel M 52 D Operating Manual
Operating Manual
Operating ManualOperating Manual
Operating Manual
M 52
M 52 D
Part
PartPart
Part Number
Number Number
Number: 520766
Version
VersionVersion
Version: 02
Date
DateDate
Date: 23-Nov-2007
Language
LanguageLanguage
Language: English
M 52
M 52 D
Control Monitor
Klein + Hummel
M 52 (D) Page 1
Introduction
IntroductionIntroduction
Introduction
Thank-you for purchasing a Klein + Hummel loudspeaker. The compact size, variety of
input connections, power sources, and extensive mounting hardware range allow the M
52 and M 52 D loudspeakers to be used with any source equipment and in a wide variety
of physical locations. The latest acoustical and electrical techniques and components have
been used to ensure the most accurate sound reproduction possible. Klein + Hummel
products are designed for longevity so we hope you enjoy many happy years of using this
product.
Klein + Hummel’s control monitors can be used on meter bridges, free-standing, mounted
on to walls, or in a rack. They can be used in music, broadcast, and post production studios
for tracking, mixing, and mastering. They can be used in stereo or multichannel systems,
with or without subwoofers.
Before reading the rest of this operating manual, review the safety and warnings section
towards the back of this book. Note that imperial dimensions are approximate.
Package Contents
Package ContentsPackage Contents
Package Contents
The shipping carton contains:
• This operating manual
• Product guarantee
• The loudspeaker
• Two mains power cables (Euro and USA)
Signal cables are not included. Accessories are listed at the end of this operating manual.
Most Common Applications and
Most Common Applications and Most Common Applications and
Most Common Applications and Listening Distances
Listening DistancesListening Distances
Listening Distances
The minimum, recommended, and maximum listening distances for each product are
shown below, together with their most common application:
Distances
DistancesDistances
Distances
Product
ProductProduct
Product Most Common
Most Common Most Common
Most Common
Application
ApplicationApplication
Application
Minimum
MinimumMinimum
Minimum Recommended
RecommendedRecommended
Recommended Maximum
MaximumMaximum
Maximum
M 52 Near-field monitoring 0.5 m (2’) 1.0 m (3’) 3 m (9’)
M 52 D Near-field monitoring 0.5 m (2’) 1.0 m (3’) 3 m (9’)
In multichannel systems, one should ideally use the same product for all main channels.
However, as the rear channels often contain less bass and the signals are mixed at a lower
level than the front channels, the rear loudspeakers can be smaller - see table below for
details. The center loudspeaker should always be of the same type as the left and right
loudspeaker. The subwoofer should be sufficient to keep up with the main loudspeakers see subwoofer operating manual for details.
Front
FrontFront
Front Ideal Rears
Ideal RearsIdeal Rears
Ideal Rears Smaller Rear
Smaller RearSmaller Rear
Smaller Rearssss Subwoofer(s)
Subwoofer(s)Subwoofer(s)
Subwoofer(s)
M 52 (D) M 52 (D) O 110 (D) O 110 (D) M 52 (D)
O 300 (D) O 300 (D) M 52 (D), O 110 (D)
Refer to subwoofer
operating manuals
Klein + Hummel
M 52 (D) Page 2
System Block Diagram
System Block DiagramSystem Block Diagram
System Block Diagram
M52 block diagram
M52 block diagramM52 block diagram
M52 block diagram
M52 D block diagram
M52 D block diagramM52 D block diagram
M52 D block diagram
Electronics
ElectronicsElectronics
Electronics Panel Picture
Panel Picture Panel Picture
Panel Picture
M 52
M 52M 52
M 52 electronics panel
electronics panel electronics panel
electronics panel M 52 D el
M 52 D elM 52 D el
M 52 D electronics panel
ectronics panelectronics panel
ectronics panel
Power Supply and Controls
Power Supply and ControlsPower Supply and Controls
Power Supply and Controls
The M 52 and M52 D have a switched-mode power supply, which can accept mains AC
voltages of 85…240 V at 50…60 Hz. In addition, DC can be applied to the 4-pin “external
power supply” connector (GND connects to pin 1, and 12…20 V connects to pin 4).
Klein + Hummel
M 52 (D) Page 3
The loudspeaker is protected from accidental application of an incorrect polarity of the DC
voltage. The mains input fuse is a slow blow 800 mA and is accessible from the outside
(next to the main power On/Off switch). The external power supply input fuse is an SB
3150 mA and is located on the inside of the cabinet. To change this fuse:
• Turn off the loudspeaker and disconnect the mains power and signal cables.
• Open the cabinet (four screws on the edge of the back panel).
• Locate the fuse holder and change the fuse for a new one with the correct
specification (slow blow 3150 mA).
• Close the back panel and reattach the mains power and signal cables.
• Power up the loudspeaker and check that the front panel light is correctly illuminated.
For mains AC power:
The power On/Off
power On/Offpower On/Off
power On/Off switch on the back panel turns the loudspeaker on and off. If the
volume control
volume controlvolume control
volume control on the front panel is rotated fully anti-clockwise the loudspeaker is placed
into standby mode. If the back panel mains switch is on, standby is indicted by a red light
on the front panel. Otherwise it is green (loudspeaker is ready to be used) or off
(loudspeaker is switched off on back panel or no power applied to the external or mains
connectors).
For the external power supply:
The 4-pin XLR input bypasses the main power On/Off
power On/Offpower On/Off
power On/Off switch. There is no standby mode
when there is an external power supply. The LED lights green when the external power is
applied.
Analog
Analog Analog
Analog Input
Input Input
Input SSSStage
tagetage
tage
The input stage
input stageinput stage
input stage is a 10 kΩ transformer balanced type on a female XLR socket.
Pin
PinPin
Pin Signal
SignalSignal
Signal
1 Audio Ground
2 Positive
3 Negative
If there is a humming or buzzing sound coming from the loudspeaker, first check it is not
the loudspeaker by disconnection the input signal cables. If the noise goes away it is not
the loudspeaker itself and so the noises must be coming from the cabling (mains power or
signal) or the source. If unbalanced cables are being used, specially wired cables can
increase the loudspeaker’s immunity from these external noises – see picture below.
Klein + Hummel
M 52 (D) Page 4
Disconnect the cable screen from the RCA sleeve if there are still humming or buzzing
sounds.
Analog connections
Analog connectionsAnalog connections
Analog connections on the M 52 and M 52 D
on the M 52 and M 52 D on the M 52 and M 52 D
on the M 52 and M 52 D
Digital Input Stage (M 52 D only)
Digital Input Stage (M 52 D only)Digital Input Stage (M 52 D only)
Digital Input Stage (M 52 D only)
In the M 52 D there is a 16…
16…16…
16…24
2424
24----bi
bibi
bitttt,,,, 32…
32…32…
32…96
9696
96 kHz digital input stage
kHz digital input stage kHz digital input stage
kHz digital input stage that can accept AES32003 (commonly known as AES/EBU), AES3id-2001, and S/P-DIF (with a suitable
connector converter) signals. De-emphasis is supported on 32, 44.1, 48, and 96 kHz
sample rates. XLR and BNC connectors ensure good interconnectivity options. It is possible
to have analog and digital signals connected, with the rear panel cable
cablecable
cable selector
selector selector
selector switch
switch switch
switch
choosing which input connector is to be monitored. The table below shows what each
switch position does:
Switch Positio
Switch PositioSwitch Positio
Switch Positionnnn Function
FunctionFunction
Function
XLR Analog or digital signal on XLR
BNC Unterminated digital input on BNC
BNC 75 Ω Terminated digital input on BNC
BNC Same as “BNC” above
Uncompressed PCM AES3, AES3id, and S/P-DIF digital signals generally contain two audio
channels (called “subframe A” and “subframe B”) on one cable (single-wire mode). A
clock input is not required because loudspeakers are not audio sources and the clock
signal is locally regenerated from data contained in the bit stream. The four-way signal
signalsignal
signal
selector
selectorselector
selector switch
switch switch
switch on the front panel allows selection of:
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