M2
Manual
(5.0E)
WARNING!
This refers to a potentially dangerous situation
which may lead to personal injury.
This refers to a potentially dangerous situation
which may lead to damage to the equipment.
This refers to a situation which may cause the
WARNING!
CAUTION!
References in the manual
IMPORTANT!
equipment to malfunction.
Symbols on the equipment
Please refer to the information in the operating
manual.
Dangerous voltage!
General Information
M2 Manual
Version 5.0E, 10/2003, D2092.E.05
©
by d&b audiotechnik AG 2003; all rights reserved.
The information contained in this manual has been carefully
checked for accuracy, at the time of going to press, however no
guarantee is given with respect to the correctness.
d&b audiotechnik AG accepts no responsibility for any errors or
inaccuracies that may appear in this manual or the products and
software described in it.
Technical specifications, dimensions, weights and properties do not
represent guaranteed qualities.
As manufacterers we reserve the right to make alterations and
modifications within the framework of legal provisions, as well as
changes aimed at improving quality.
d&b audiotechnik AG
Eugen-Adolff-Strasse 134, D-71522 Backnang, Germany
Telephone +49-7191-9669-0, Fax +49-7191-95 00 00
E-mail: docadmin@dbaudio.com, Internet: www.dbaudio.com
Safety precautions
Before you use our products, read the manual
carefully and observe all the safety precautions.
They will protect you and help to avoid equipment
failures.
Keep this manual in a safe place so that it is
available for future reference.
If you supply d&b products, please draw the
attention of your customers to these safety
guidelines. Enclose the relevant manuals with the
systems. If you require additional manuals for this
purpose, you can order them from d&b.
Information regarding use of loudspeakers
WARNING!
Never stand in the immediate vicinity of loudspeakers driven at a
high level. Professional loudspeaker systems are capable of causing
a sound pressure level detrimental to human health. Seemingly noncritical sound levels (from approx. 95 dB SPL) can cause hearing
damage if people are exposed to it over a long period.
In order to prevent accidents when deploying loudspeakers on the
ground or when flown, please take note of the following:
When setting up the loudspeakers or loudspeaker stands, make sure
they are standing on a firm surface. If you place several systems on
top of one another, use straps to secure them against movement.
Only use accessories which have been tested and approved by d&b
for assembly and mobile deployment. Pay attention to the correct
application and maximum load capacity of the accessories as
detailed in our specific “Mounting instructions” or in our "Flying
system and Rigging manuals”.
Ensure that all additional hardware, fixings and fasteners used for
installation or mobile deployment are of an appropriate size and
load safety factor. Pay attention to the manufacturers instructions
and to the relevant safety guidelines.
Regularly check the loudspeaker housings and accessories for visible
signs of wear and tear, and replace them when necessary.
Regularly check all load bearing bolts in the mounting devices.
CAUTION!
M2 Manual (5.0E) Page 3 of 8
M2 Manual (5.0E) Safety instructions
Loudspeakers produce a static magnetic field even if they are not
connected or are not in use. Therefore make sure when erecting
and transporting loudspeakers that they are nowhere near
equipment and objects which may be impaired or damaged by an
external magnetic field. Generally speaking, a distance of 0.5 m
(1.5 ft) from magnetic data carriers (floppy disks, audio and video
tapes, bank cards, etc.) is sufficient; a distance of more than 1 m
(3 ft) may be necessary with computer and video monitors.
M2
1
2
3
4
5
1
2
3
4
5
Sense Drive
The M2 is a 2-way active monitor employing two 12" LF drivers in
an airflow optimized bass-reflex cabinet. It contains a 1.4" HF
driver using a compact but extremely strong neodymium magnet
assembly, mounted on a low distortion horn optimized for monitor
applications.
The M2 cabinet is constructed from marine plywood and has an
impact resistant paint finish. The front of the loudspeaker cabinet is
fitted with a rigid metal grill backed with a replaceable acoustically
transparent foam. Two sockets which accept the Z5048 Flying pin
are located on both sides of the cabinet allowing quick and flexible
rigging.
Connector wiring
CAUTION!
Only operate M2 cabinets with a d&b D12 amplifier in
"2-Way Active" and M2 mode or an A1 mainframe fitted with an
M2 controller module, otherwise there is a risk of damaging the
loudspeaker components.
Connections
The M2 cabinet is fitted with two EP5 connectors (male/female). All
pins are wired in parallel and uses the pin assignments 1/2/3/4
and 5 (Pin 5: SenseDrive - D12 only and in conjunction with 5-wire
cables).
Using one connector as the input, the second connector allows for
direct connection to additional cabinets.
The M2 can be supplied with two CACOM connectors as an option
to drive the M2 cabinet with the d&b A1 mainframe.
LF+ LF– HF+ HF– SenseDrive LF
EP5
EP5 pin assignments
12345
M2 Manual (5.0E) Page 4 of 8
INPUT A
OUT A
2-Way
SenseDrive
OUT B
2-Way
AMP B
AMP A
D12 Input/Output routing
2-Way Active mode
Operation with D12
Selecting "2-Way Active" and M2 mode enables up to two M2
cabinets to be driven actively by the D12 amplifier.
The input signal is fed to INPUT A, while the input signal is routed
(linked) to INPUT B internally.
IMPORTANT!
Frequency response of CPL circuit
To apply SenseDrive for the LF driver of both cabinets they should
be linked together locally and connected to the output A connector
of the D12 amplifier.
Controller settings
For acoustic adjustment the settings CUT and CPL can be selected.
CUT
Set to CUT, a high pass filter with a 110 Hz cut off frequency is
inserted in the controller signal path. The M2 is now configured for
use with d&b active subwoofers.
CPL circuit
The CPL (Coupling) circuit compensates for coupling effects
between the cabinets when building closely coupled arrays. CPL
begins gradually at 1 kHz, with maximum attenuation below
400 Hz, providing a balanced frequency response when the M2
cabinet is used in arrays of two or more. The function of the CPL
circuit in the D12 amplifier is shown in the diagram opposite and
can be set in dB attenuation values between –9 and 0, or a positive
CPL value which creates an adjustable low frequency boost around
65 Hz (0 to +5 dB).
The following CPL settings correspond to the M2 controller settings
of the A1 and are described in the following section "Operation
with A1 - LFC level control":
0 dB = Floor, +3 dB = Free, –3 dB = Pair
M2 Manual (5.0E) Page 5 of 8
Operation with A1
GR LO
ISP
GR HI
OV LO
OV HI
CUT
MUTE
M2
FLOOR
FREEPAIR
0
-6
-12
dB LF COUPLING
ID
+6
Two M2 cabinets can be driven by a single A1 mainframe fitted
with an M2 controller module.
CUT switch
The CUT setting is available. The characteristics of the CUT setting
is explained under the previous section "Operation with D12 Controller settings".
LFC level control
The detented LFC control (Low Frequency Coupling) adjusts the
systems low and low/mid response for the different operating
environments of the M2 cabinet.
The
FLOOR
position is the standard setting for a single M2, used
as a floor monitor.
Controls on M2
controller module
6
5
4
3
FREE
2
1
0
-1
-2
-3
-4
-5
-6
10
Frequency responce LFC setting
(min. and max.)
100 1k 10k
PAIR
Turning the control to the
PAIR
position, the low and lower/mid
frequency range is further reduced (Corner frequency about
600 Hz). The maximum left position fully compensates the different
coupling behaviour of the low and high frequencies when two
cabinets are used in a paired monitor application.
Turning towards
FREE
increases the systems low end for operation
without floor coupling (e.g. flown).
Dispersion characteristics
The diagrams below show dispersion angle vs frequency plotted
using lines of equal sound pressure (isobars) at –6 dB and –12 dB.
The nominal 45
°
horizontal dispersion angle is maintained from
800 Hz - 10 kHz.
M2 isobar diagram horizontal M2 isobar diagram vertical
M2 Manual (5.0E) Page 6 of 8
Frequency response
The diagram below shows the frequency response of the M2
cabinet in floor monitor position, measured at a height of 1.7m
(5.6 ft) (listening position in monitor operation) on axis:
10
5
0
-5
-10
-15
-20
-25
-30
20
M2 frequency response, monitor operation
100 1k 10k
20k
Technical specifications
M2 system data
Frequency response (–5 dB, free field) ..................................................56 Hz - 17 kHz
Frequency response (-5 dB, floor coupling)..........................................50 Hz - 17 kHz
Max. sound pressure level (1 m, free field) with D12 or A1 ........................... 143 dB
(SPLmax peak, pink noise test signal with crest factor of 4)
Input level (100 dB SPL / 1 m)...............................................................................–26 dBu
Polarity to controller INPUT (XLR pin 2: + / 3: –) .................................. LF: – / HF: –
M2 loudspeaker
Nominal impedance LOW/HIGH...................................................................4 / 8 ohms
Power handling capacity LOW (RMS / peak 10 ms)..........................500 / 2000 W
Power handling capacity HIGH (RMS / peak 10 ms)...............................50 / 200 W
°
Nominal dispersion angle (hor. x vert.)...........................................................45
x 60
Connections ..................................................................................................................2 x EP5
Pin assignments .................................... 1: LF+/2: LF–/3: HF+/4: HF–/5: SenseDrive
optional................................................................................................................2 x CACOM
Pin assignments printed on the A1 controller module rear panel
Weight .................................................................................................................38 kg (83 lb)
°
M2 cabinet dimensions in mm [inch]
M2 Manual (5.0E) Page 7 of 8
EU declaration of conformity (CE symbol)
We herewith declare that said products are in
The following standards have been applied:
EU conformity of loudspeakers
This declaration applies to loudspeakers manufactured by d&b
audiotechnik AG and includes the types listed in the table below:
−
M2 Z0061
All production versions of these types are included, provided they
correspond to the original technical version and have not been
subject to any later design or electromechanical modifications.
conformity with the provisions of the following EC
directives including all applicable amendments:
−
89/336 Electromagnetic Compatibility
−
DIN EN 55013:08-1991
−
DIN EN 55020:05-1995
−
DIN EN 50082-1:03-1993
M2 Manual (5.0E) Page 8 of 8
d&b audiotechnik AG, Eugen-Adolff-Str. 134, D-71522 Backnang, Germany, Phone +49-7191-9669-0, Fax +49-7191-95 00 00
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