MBL 9007 User manual

ENGLISH 
DEUTSCH 

mbl 9011 | mbl 9008 A | mbl 9007
1
Important Information!
Attention: The unit must be protected against humidity, vibration and excessive dust and should not be exposed to
direct sunlight or intense sources of heat (radiators). Do not operate the unit in the immediate vicinity of sources
of electrical interference (e.g. fluorescent lamps or electric motors). The permitted operating temperature is 10°C
up to 40°C (50°F up to 104°F). Avoid extreme variations in temperature.
Do not operate the unit under condensation! After exposure to low temperatures allow the unit to warm up for
at least three hours.
Do not open the unit and do not make any alterations to it.
If you wish to place the unit on a rack, you must ensure sucient ventilation. Minimum clearances of 10 cm (4 inch)
above the unit and 2 cm (0,8 inch) on all sides must be observed. The ventilation openings of the unit must not
be covered with tablecloths, magazines, curtains and the like in order not to interfere with the heat dissipation.
Make sure that no fluid-filled vessels (glasses, vases…) are put on the device to prevent water from ingressing the
device, and the device is never exposed to splash water.
NEVER switch power amplifier on when no speaker is connected!
KETI, CE-Marking
This product conforms to the requirements of the EMC directive and low-voltage directive. Your MBL component
complies with the household power and safety requirements in your area.
Warranty
Please pay attention to the details given in the warranty card which accompanies the unit. Warranty is only issued,
if you send back the warranty card.

mbl 9011 | mbl 9008 A | mbl 9007
2
Page
3 1. Placement
3 2. Connecting Power Amplifier(s) to Speakers and Preamplifier
4 2.1 General Information Wiring
5 2.2 a) Connecting to speakers in stereo mode, single wiring
6 2.2 b) Connecting to speakers in stereo mode, bi-wiring
7 2.2 c) Connecting to preamplifier in stereo mode
8 2.3 a) Connecting to speakers in mono mode, single wiring
9 2.3 b) Connecting to speakers in mono mode, bi-wiring
10 2.3 c) Connecting to preamplifier in mono mode
11 2.4 a) Connecting to speakers in stereo mode, bi-amping (2 power amps)
12 2.4 b) Connecting to preamplifier in stereo mode, bi-amping (2 power amps)
13 2.5 a) Connecting to speakers in mono mode, bi-amping (4 power amps)
14 2.5 b) Connecting to preamplifier in mono mode, bi-amping (4 power amps)
15 3. Installation
15 3.1 Power Switches
16 3.2 Mains Voltage
16 3.3 Fuses
16 3.4 First Operation
16 3.5 Standby Mode and Sleep Mode
17 3.6 Remote switching-on
17 4. Maintenance
18 5. Troubleshooting
19 6. Views
19 6.1 mbl 9011 Views
20 6.2 mbl 9008 A Views
21 6.3 mbl 9007 Views
22 7. Specifications

mbl 9011 | mbl 9008 A | mbl 9007
3
1. Placement
Please ensure that there is sucient ventilation and flow of air on all sides of the amplifier. There must be a minimum space of
10 cm (approx. 4”) above the amplifier so that the heat can escape.
Note: Never completely cover or operate the amplifier in a place with insucient flow of air. If you do, the amplifier may over-
heat.
In case you wish to operate two or more amplifiers never stack them. You may place them on shelves or fit them under a cabinet.
Remember to keep the minimum space of 10 cm (approx. 4”) above the amplifier.
Keep the amplifier away from humidity, vibration, excessive dust and direct sunlight. Do not operate the amplifier near other
electric appliances (for instance neon lights and motors).
2. Connecting Power Amplifier(s) to Speakers and Preamplifier
To connect your power amplifier(s) properly to your loudspeakers and your preamplifier please refer to the following descrip-
tions and diagrams.
Attention! The power amplifier works fully balanced, if operated as mono block. The minus-terminals are not connected to
ground. Therefore, never connect any ground-related potentials, as is common with active and semi-active speaker systems
(including active subwoofers).
Advice: Remove all cables from inputs that are not in use. Pin assignment of XLR plug
1 = ground
2 = + in phase
3 = - o phase

mbl 9011 | mbl 9008 A | mbl 9007
4
2.1 General Information Wiring
Please note when wiring your amps mbl 9008 A and mbl 9011:
In the planning of high quality music systems, the cabling plays an important role. Users should pay particular attention to the
selection of the proper cable and cabling structure. This is especially true when the music system works with high-quality ampli-
fiers with high bandwidths, such as the mbl 9011 or mbl 9008 A.
Increasingly, it should be noted that some cable manufacturers oer quite exotic cable types in addition to well-functioning
cable designs and recommend alternative cabling types and structures. However, this does not always lead to the desired opti-
mization of the sound, but on the contrary can lead to a deterioration of the sound quality or even cause damage to or destruc-
tion of individual components of your music system.
To prevent this, when using our amplifiers mbl 9008 A or mbl 9011, please consider the following points. We expressly point out
that non-observance can lead to sound degradation and malfunction or damage to portions of your music system:
1. The plus conductor and minus conductor of your speaker cable must run together in a common cable. A separate routing
of the lines would lead to the formation of a magnetic field, which would be greater, the greater the distance between the
lines. This would increasingly occur, particularly at higher frequencies, since the magnetic field is proportional to the square
root of the frequency.
2. All signal cables between the individual components of the music system must be shielded. Never use unshielded or “float-
ing shield” cables, even if they are currently highly touted by some cable manufacturers. Non-compliance leads to interfer-
ence of radio signals from mobile phones and mobile phone masts, Wi-Fi radio waves, DECT signals or other RF signals.
3. Input cable to the power amps should never be laid parallel to the speaker cables, since this would lead to interference of
the output signal in the input signal. If at all possible, please cross the input cable and the speaker cable at 90 degree angles
to minimize this potential.
Strict observance of the above points will ensure that no high frequency magnetic field is created which might intersperse in the
input signal and lead to the intensification of magnetic positive feedback and oscillation. Such eects could otherwise result in
damage to or destruction of the output stage, harm loudspeaker parts/drivers, etc.

mbl 9011 | mbl 9008 A | mbl 9007
5
2.2 a) Connecting power amplifier to speakers in stereo mode, single wiring
Note the imprint STEREO on the back of the power amplifier.
If you want to connect one power amplifier to your loudspeakers in single wiring mode, use the STEREO connectors on the back
of the power amplifier. Connect the right speaker to the terminal area marked with R and the left speaker to the terminal area
marked with L. Connect the minus terminal of each speaker with the respective ground connector ( ) of the power amplifier.
Connect the plus terminal of each speaker to the respective plus connector (STEREO) of the power amplifier.
power amplifier
stereo
right speakerleft speaker
Example with mbl 111 F Radialstrahler Hybrid

mbl 9011 | mbl 9008 A | mbl 9007
6
2.2 b) Connecting power amplifier to speakers in stereo mode, bi-wiring
Note the imprint STEREO on the back of the power amplifier.
If you want to connect one power amplifier to your loudspeakers in bi-wiring mode, use the STEREO connectors on the rear side
of the power amplifier. Connect the right speaker to the terminal area marked with R and the left speaker to the terminal area
marked with L.
Connect both minus terminals (WOOFER and SYSTEM) of each speaker with the respective ground connector ( ) of the power
amplifier. Connect the plus terminals of each speaker to the respective plus connectors (STEREO) of the power amplifier.
left speaker right speaker
power amplifier
stereo
WOOFER
terminals
SYSTEM
terminals
WOOFER
terminals
SYSTEM
terminals
Example with mbl 101 E MKII Radialstrahler

mbl 9011 | mbl 9008 A | mbl 9007
7
2.2 c) Connecting power amplifier to preamplifier in stereo mode (Unbalanced Stereo)
Connect the preamplifier‘s output to the power amplifier‘s input with RCA cable.
Note: Right channel „R“ (red) and left channel „L“ (white).
preamplifier
RCA cable left
RCA cable right
power amplifier
stereo

mbl 9011 | mbl 9008 A | mbl 9007
8
2.3 a) Connecting power amplifiers to speakers in mono mode, single wiring
Note the imprint MONO on the back of the power amplifier.
If you want to connect two power amplifiers to your loudspeakers in single wiring mode, use the MONO connectors of the power
amplifiers. Connect the plus terminal of each speaker to the respective plus connector of the power amplifier and the minus
terminal to the minus connector.
left speaker right speaker
mono power amp left mono power amp right
Example with mbl 111 F Radialstrahler Hybrid

mbl 9011 | mbl 9008 A | mbl 9007
9
2.3 b) Connecting power amplifiers to speakers in mono mode, bi-wiring
Note the imprint MONO on the back of the power amplifier.
If you want to connect two power amplifiers to your loudspeakers in bi-wiring mode, use the MONO connectors of the power
amplifiers. Connect each loudspeaker to one power amplifier. Connect the plus terminals (WOOFER and SYSTEM) to the respec-
tive plus connectors and the minus terminals to the minus connectors.
left speaker right speaker
mono power amplifier
left
mono power amplifier
right
WOOFER
terminals
SYSTEM
terminals
WOOFER
terminals
SYSTEM
terminals
Example with mbl 101 E MKII Radialstrahler

mbl 9011 | mbl 9008 A | mbl 9007
10
2.3 c) Connecting power amplifiers to preamplifier in mono mode (Balanced Mono)
Connect the preamplifier’s output to the power amplifier’s input with balanced cable. Connect the right channel “R” of the pre-
amplifier to the input of the power amplifier for the right speaker. Connect the left channel “L” of the preamplifier to the input
of the power amplifier for the left speaker.
power amplifier 1
(right speaker)
power amplifier 2
(left speaker)
preamplifier
Balanced cable left
Balanced cable right

mbl 9011 | mbl 9008 A | mbl 9007
11
2.4 a) Connecting power amplifiers to speakers in stereo mode, bi-amping (2 power amplifiers)
Note the imprint STEREO on the back of the power amplifier.
If you want to connect two power amplifiers to your loudspeakers in stereo mode, use the STEREO connectors of the power
amplifiers. Connect each loudspeaker to one power amplifier. Connect the plus terminals (WOOFER and SYSTEM) to the respec-
tive plus connectors and the minus terminals to the ground connectors ( ).
left speaker right speaker
stereo power amplifier
left
stereo power amplifier
right
WOOFER
terminals
SYSTEM
terminals
WOOFER
terminals
SYSTEM
terminals
Example with mbl 101 E MKII Radialstrahler

mbl 9011 | mbl 9008 A | mbl 9007
12
2.4 b) Connecting power amplifiers to preamplifier in stereo mode, bi-amping (2 power amps)
This mode requires that the respective preamplifier has 2 outputs of completely the same quality (e.g. mbl 6010 D or mbl 5011).
Use RCA cables for the connection of preamplifier and power amplifier.
Right amplifier: Connect one right stereo channel “R” of the preamplifier to the stereo input “L” of the power amplifier and the
second stereo channel “R” of the same output group of the preamplifier to the stereo input “R” of the power amplifier (right
speaker).
Left amplifier: Connect one left stereo channel “L” of the preamplifier to the stereo input “L” of the power amplifier and the sec-
ond left stereo channel “L”of the same output group of the preamplifier to the stereo input “R” of the power amplifier.
preamplifier
power amplifier left
power amplifier right
RCA cable
RCA cable
RCA cable
RCA cable

mbl 9011 | mbl 9008 A | mbl 9007
13
2.5 a) Connecting power amplifiers to speakers in mono mode, bi-amping (4 power amps)
Note the imprint MONO on the back of the power amplifier.
If you want to connect four power amplifiers to your loudspeakers, connect SYSTEM and WOOFER seperatly to each power
amplifier. Use the MONO connectors of the power amplifier. Connect the minus terminal to the respective minus connector and
the plus terminal to the respective plus connector.
left speaker right speaker
left power amplifier
WOOFER
left power amplifier
SYSTEM
right power amplifier
WOOFER
right power amplifier
SYSTEM
WOOFER
terminals
SYSTEM
terminals
WOOFER
terminals
SYSTEM
terminals
Example with mbl 101 E MKII Radialstrahler

mbl 9011 | mbl 9008 A | mbl 9007
14
2.5 b) Connecting power amplifiers to preamplifier in mono mode, bi-amping (4 power amps)
This mode requires that the respective preamplifier has 2 outputs of completely the same quality (mbl 6010 D or mbl 5011).
Balanced-cables are used for the connection of preamplifier and power amplifier.
Connect the preamplifier’s output-channel 1 (right) with the input “Mono” of the first power amplifier. Connect the preamplifier’s
output-channel 2 (right) with the input “Mono” of the second power amplifier (right speaker).
Connect the preamplifier’s output-channel 1 (left) with the input “Mono” of the third power amplifier. Connect the preamplifier’ s
output-channel 2 (left) with the input “Mono” of the fourth power amplifier (left speaker).
preamplifier
power amplifier left 2 power amplifier left 1
power amplifier right 1power amplifier right 2
Balanced cable left 2
Balanced cable left 1
Balanced cable right 2
Balanced cable right 1

mbl 9011 | mbl 9008 A | mbl 9007
15
3. Installation
3.1 Power Switches
The mbl 9011 has 3, the mbl 9008 A has 2 and the mbl 9007 has 1 main power transformer(s) to produce high power output
and to provide optimal impedance matching. They are switched depending on the respective load. The power amplifiers are
equipped with a separate shielded transformer, supplying the voltage amplification stage.
Due to the high maximum output power capability (when the “Boost”-switches 2 or 2+3 are switched on) high current flow in
the primary supply area is created. Therefore you need a second power cord for the „Boost“-operation.
Recommended power-switch positions for dierent loudspeaker impedances
Power switch Speaker load mono Speaker load stereo Power amplifier
Power switch 1 8 O8 O/ 4 Ombl 9011/9008 A/9007
Power switch 1+2 8 O/ 4 O8 O/ 4 O/ 2 Ombl 9011/9008 A
Power switch 1+2+3 8 O/ 4 O/ 2 O8 O/ 4 O/ 2 Omb 9011
mbl 9011 power switches mbl 9008 A power switches

mbl 9011 | mbl 9008 A | mbl 9007
16
3.2 Mains Voltage
The mbl 9011 is equipped with 4, the mbl 9008 A with 3 and the 9007 with 2 low-dissipation toroidal transformers. They operate
at 230 Vac or 115 Vac, 50/60 Hz. The rear side indicates the selected mains voltage which has been pre-set by the manufacturer.
Change this setting only, if you want to use the amp in a country with dierent mains voltage. A change of the mains voltage is
done inside the unit by using solder bridges. Always have a qualified service technician or a qualified dealer to do this for you.
This procedure is not a warranty service.
3.3 Fuses
Caution: Disconnect the power cord from the electric outlet before checking the fuses!
The fuse holders for the primary fuses are located next to the power switches on the rear side of the amp. The holders take 5 x
20 mm fine-wire type fuses. Two fuses are needed for each power switch. You must change the value of the fuse, if you use a
dierent mains supply (230 Vac/4 AT or 115 Vac/8 AT).
Inside the amp, next to the transformers, are the fuse holders for the secondary fuses. Their value is 10 AT (5 x 20 mm fine-wire
type), irrespective of the mains voltage.
3.4 First Operation
Make all necessary connections (input, output, mains) and press the power switches (on the rear side of the amp). mbl 9011/9008 A:
Always activate power switch 1 first.
When the amp is switched on, the blue LED´s on the front panel will light. In addition to the blue LED’s a yellow one will be il-
luminated between them.
3.5 Standby Mode and Sleep Mode
To switch “on” and “o” the standby mode press the standby switch on the left side of the amp. When the amp is in standby
mode the blue LED´s on the front panel are not lighted, only the yellow LED lights. (mbl 9007: the blue LEDs on the front panel
glow in low intensity).
When the amplifier is in standby mode only the input electronics are held at operating temperature. No music can be heard in
this mode. We recommend this mode for turning o the amplifier (20 W power consumption).
mbl 9007: With the sleep button of the mbl 9007 you can toggle between sleep and standby mode. In sleep mode the blue LED´s
on the front panel are o, only a yellow LED in the center is on. In this mode the power consumption is reduced to 4 VA.
In both modes no signal appears on the speaker terminals.

mbl 9011 | mbl 9008 A | mbl 9007
17
3.6 Remote switching-on
The power amplifiers mbl 9008 A and mbl 9011 have the ability to be switched on and o remotely by use of a preamplifier. You
will find the remote-socket on the back of the amplifier. You can connect this remote socket with the remote-out sockets of your
preamplifier. When you switch on the preamplifier, a 10 V switching voltage is supplied to these remote-out sockets. When you
switch o the preamplifier, this output is set to 0 V. A suitable connection cable can be made on request. Your hi-fi dealer will
be happy to give advice.
4. Maintenance
Always unplug the unit before cleaning!
To clean the exterior surfaces of your mbl power amplifier use a dry, soft cloth. To wipe o fingerprints and other grease spots
use a soft, wet cloth moistened with a mild detergent dissolved in water.
Caution! The cloth must never be dripping wet! If water or other fluids enter the cabinet, you risk damaging the unit.
Never use scouring pads, steel wool, scouring powders or harsh chemical agents, alcohol, thinners, benzine, insecticide or other
volatile substances, as these will destroy the cabinet’s finish.

mbl 9011 | mbl 9008 A | mbl 9007
18
5. Troubleshooting
The amp does not work, power switch is not illuminated
• Check if the power cord is plugged in the “Main Power”-socket and the power switch 1 is switched on. It is necessary that you
activate power switch 1 first. Note that the power cord must be connected to the AC wall socket as well.
• Disconnect the power cord and check the primary fuses on the rear side of the amplifier (mbl 9011/9008 A: next to the power
switches, mbl 9007: next to the power cord connector). To open the fuse holder take a screwdriver, insert it in the slide of the
safety lock, push and turn a quarter of a rotation. Now take o the cover. Remove the fuse, check it, and exchange, if necessary.
Fuse type and value see “Mains Voltage”. If the spare fuse blows too, please contact your dealer or service department.
Danger! Before removing/installing any fuses, switch o the power amplifier and disconnect it from the mains circuit!
No music
• Check if the standby switch is in the “standby” position.
You hear music, but something is wrong
• Check if you plugged in more than one inputs (symmetric and RCA). Disconnect all inputs that are not in use. See also “Con-
necting power amplifier to preamplifier”.
• Check if the speakers have been connected correctly. See also “Connecting power amplifier to speakers”.
• In case there is not enough power output, you should check, whether you have activated the sucient number of power
switches to control the speaker load.
Power switch is illuminated, no music or distorted music
Attention! Only authorized MBL-dealers may proceed with the following!
Check the secondary fuses inside the amp:
• Disconnect power cord(s) first!
• Remove the 4 screws on the left side panel (looking from the front). Lift the side panel.
• Remove the fuses from the fuse holders and exchange them, if necessary.
In all instances of malfunction please contact your local MBL dealer first.
d
a
b
c

mbl 9011 | mbl 9008 A | mbl 9007
19
XLR plug
speaker connectors connectors for
power cord
RCA jackets
fuse holders power switches
6. Views
6.1 mbl 9011 Views
standby switch function indicators