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Klein + Hummel M 52 User manual

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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: nglish
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 ( uro 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 Rears
ss
s
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
lectronics
lectronicslectronics
lectronics 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 L D lights green when the external power is
applied.
Analog
Analog Analog
Analog Input
Input Input
Input S
SS
Stage
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
bit
tt
t,
,,
,
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 A S3-
2003 (commonly known as A S/ BU), A S3id-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 Position
nn
n
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 A S3, A S3id, 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:
Klein + Hummel
M 52 (D) Page 5
•“L” (digital subframe A)
•“L+R” (mono sum of subframe A and subframe B)
•“R” (digital subframe B)
•“ANALOG” (XLR input connector only). Note the signal selector switch on the back
panel should be set to “BNC 75 Ω” when not using the digital input.
Always use good quality cables with the correct impedance to achieve these maximum
cable lengths:
Format (Connector)
Format (Connector)Format (Connector)
Format (Connector)
Impedance
ImpedanceImpedance
Impedance
Cable Length
Cable LengthCable Length
Cable Length
S/P-DIF (RCA) 75 Ω up to 10 m (30’)
A S3 (XLR) 110 Ω up to 100 m (300’)
A S3id (BNC) 75 Ω up to 1000 m (3000’)
An A S3 signal (applied to the XLR connector) is point-to-point and may not be looped, so
the BNC connector is used to connect additional monitors to the A S3 signal. The signal
selector switch on the first loudspeaker should be set to the “XLR” setting. This outputs
an A S3id signal from the BNC connector for connecting additional monitors to the
original A S3 signal. The second loudspeaker should have its signal selector set to the
“BNC 75 Ω” setting. See picture below:
XLR digital
XLR digitalXLR digital
XLR digital
input
input input
input connections on the M 52 D
connections on the M 52 Dconnections on the M 52 D
connections on the M 52 D
An A S3id or S/P-DIF signal (applied to the BNC connector) can be looped using a T-piece
connector (not supplied) for connecting additional monitors to the input signal. The signal
selector switch on the first loudspeaker should be set to the “BNC” setting. To terminate
the cable correctly, the second loudspeaker should have its signal selector switch set to
the “BNC 75 Ω” setting. An appropriate setting should be made on the front panel signal
selector switch depending on the signal channel order and loudspeaker position. See
picture below:
Klein + Hummel
M 52 (D) Page 6
BNC digital
BNC digitalBNC digital
BNC digital
input
input input
input connections on the M 52 D
connections on the M 52 Dconnections on the M 52 D
connections on the M 52 D
If there are multiple M 52 D monitors connected together using BNC T-piece connectors,
the first one should be set to “A S” or “BNC” as appropriate. The rest should be set to
“BNC”, except the last one which should be set to “BNC 75Ω”. Finally, an appropriate
setting should be made on the front panel signal selector switch depending on the
location of the loudspeaker.
Note that the BNC connector has no output driver. When using the A S3 input, the output
level is derived passively from the A S3 signal’s input level. This has a wide tolerance,
therefore the length of the interconnection cable and number of loudspeakers will depend
on the level of the source signal and quality of the interconnecting cables.
Multiple
Multiple Multiple
Multiple M 52 D
M 52 DM 52 D
M 52 D
connections
connections connections
connections using BNC
using BNCusing BNC
using BNC
It is possible to have an analog XLR and a digital BNC cable simultaneously connected to
the loudspeaker. The signal selector switch is used to monitor the required input.
Klein + Hummel
M 52 (D) Page 7
AES3id or S/P-DIF
Digital Source Analog Source
Digital Signal
Analog Signal
Subframe A – Left signal
Subframe B – Rig t signal
BNC XLR
Left
signal
Rig t
signal
XLR BNC
L R
Set rear panel
switc to ““BNC”
Set rear panel
switc to “BNC 75Ω”
Simultaneous a
Simultaneous aSimultaneous a
Simultaneous analog
nalog nalog
nalog and digital
and digital and digital
and digital connections on the M 52 D
connections on the M 52 Dconnections on the M 52 D
connections on the M 52 D
Volume Control
Volume ControlVolume Control
Volume Control
A volume control
volume controlvolume control
volume control on the front panel allows the loudspeaker to be matched to a wide
range of equipment outputs whilst maintaining the desired acoustical output. This control
is also used to match the output level of the loudspeaker that of other loudspeakers in
the audio reproduction system. When the volume control is set to maximum, a +6 dBu
(1.55 V) input signal gives 100 dB SPL output at 1 m. The maximum input level that the
input stage can accept is +19 dBu (7 V). The maximum acoustical output of the
loudspeaker is limited by the protection system. In general, larger loudspeakers can play
louder and for longer periods than smaller loudspeakers. As with any other component in
the audio chain, it is best to use the lowest gain for the application so as to minimize
amplification of the preceding equipment’s source noise. To check this, if the noise drops
dramatically when the input cable is unplugged, the noise is coming from the source not
the loudspeaker.
Amplification and Driver
Amplification and DriverAmplification and Driver
Amplification and Driver
Amplifiers featuring low harmonic and intermodulation distortions, and low noise to
ensure a clean audio reproduction. Although no damage will result, insufficient cooling
will cause the amplifier protection to activate prematurely thereby limiting the system’s
maximum output level.
A long throw, efficient, low distortion driver ensures a clean sound quality even at high
replay levels. The driver is loaded by the internal volume of the cabinet and is
magnetically shielded for use near CRT screens or magnetic storage media. The system’s
SPL output and the cabinet volume can be seen in the specifications section.
Cabinet
CabinetCabinet
Cabinet
The aluminum cabinet is painted using the RAL color (7021). An appropriately colored
pen can be used to touch up the paintwork if it is scratched during transport or use.
Klein + Hummel
M 52 (D) Page 8
The acoustical axis is a line normal to the loudspeaker’s front panel along which the
microphone was placed when tuning the loudspeaker’s crossover during design. Pointing
the acoustical axis, in the horizontal and vertical planes, towards the listening position or
centre of the listening area will give the best measured and perceived sound quality. The
acoustical axis of Klein + Hummel’s control monitors is located in the middle of the driver.
Product
ProductProduct
Product
x dimension
x dimensionx dimension
x dimension
y dimension
y dimensiony dimension
y dimension
M 52 6.0 cm (2
3
/
8
“) 10.0 cm (3
7
/
8
“)
M 52 D 6.0 cm (2
3
/
8
“) 10.0 cm (3
7
/
8
“)
M 52 (D) Acoustical Axis
M 52 (D) Acoustical AxisM 52 (D) Acoustical Axis
M 52 (D) Acoustical Axis
Acoustical Response
Acoustical ResponseAcoustical Response
Acoustical Response
The M 52 and M 52 D have been designed to have a flat frequency response when used in
their typical application, on a meter bridge or mounted in a rack, however they will still
have a good response when used in other applications. If the sound quality is not
acceptable, try moving the loudspeaker or nearby objects until it is. An acoustical
measurement system can be used to help find the best location. In all cases, point the
loudspeaker towards the listening position to achieve the best sound quality.
System Protection
System ProtectionSystem Protection
System Protection
A high pass filter protects the amplifier and driver from high energy bass content that
cannot be reproduced by the smaller driver. If deeper bass is required, use a larger
loudspeaker, or add a subwoofer to handle the high-level low-frequency energy.
The amplifier has built-in thermal protection. The protection systems cannot protect
against sustained abuse of the loudspeaker.
Mounting Options
Mounting OptionsMounting Options
Mounting Options and
and and
and Accessories
AccessoriesAccessories
Accessories
The
3
/
8
” thread on the base of the cabinet may be used for attaching the M 52 or M 52 D
to a standard microphone stand. The M6 threads on either side of the cabinet can be used
with the LH 11 table stand and MA 19 rack mount frame.