thomann S-75 User manual

S-75 • S-100 • S-150
power amplifier
user manual

Musikhaus Thomann e.K.
Treppendorf 30
96138 Burgebrach
Germany
Telephone: [phone]
email: [email protected]
Internet: www.thomann.de
09.12.2011

Table of contents
1 General notes............................................................................................................................................... 4
2 Safety instructions..................................................................................................................................... 7
3 Connections and operating elements........................................................................................... 12
4 Installation and starting up................................................................................................................ 20
4.1 Pin assignment.................................................................................................................................. 22
4.2 Tips on handling speakers............................................................................................................ 26
4.3 More useful tips................................................................................................................................ 27
5 Technical specifications....................................................................................................................... 29
6 Protecting the environment.............................................................................................................. 31
Table of contents
S-75 • S-100 • S-150
3

1 General notes
This user manual contains important information on the safe operation of the device. Read and
follow all safety notes and all instructions. Save this manual for future reference. Make sure
that it is available to all persons using this device. If you sell the device to another user, be sure
that they also receive this manual.
Our products are subject to a process of continuous development. We therefore reserve the
right to make changes without notice.
This section gives an overview of the symbols and signal words used in this user manual.Symbols and signal words
General notes
power amplifier
4

Signal word Meaning
DANGER! This combination of symbol and signal word
indicates an immediate dangerous situation
that will result in death or serious injury if it is
not avoided.
CAUTION! This combination of symbol and signal word
indicates a possible dangerous situation that
can result in minor injury if it is not avoided.
NOTICE! This combination of symbol and signal word
indicates a possible dangerous situation that
can result in material and environmental
damage if it is not avoided.
Warning signs Type of danger
Warning – high-voltage.
General notes
S-75 • S-100 • S-150
5

Warning signs Type of danger
Warning – danger zone.
General notes
power amplifier
6

2 Safety instructions
Use the device only as described in this user manual. Any other use or use under other oper‐
ating conditions is considered to be improper and may result in personal injury or property
damage. No liability will be assumed for damages resulting from improper use.
This device may be used only by persons with sufficient physical, sensorial, and intellectual
abilities and having corresponding knowledge and experience. Other persons may use this
device only if they are supervised or instructed by a person who is responsible for their safety.
DANGER!
Danger for children
Ensure that plastic bags, packaging, etc. are disposed of properly and are not
within reach of babies and young children. Choking hazard!
Ensure that children do not detach any small parts (e.g. knobs or the like) from
the unit. They could swallow the pieces and choke!
Never let children unattended use electrical devices.
Intended use
Safety
Safety instructions
S-75 • S-100 • S-150
7

DANGER!
Electric shock caused by high voltages inside
Within the device there are areas where high voltages may be present. Never
remove any covers.
There are no user-serviceable parts inside.
DANGER!
Electric shock caused by short-circuit
Always use proper ready-made insulated mains cabling (power cord) with a pro‐
tective contact plug. Do not modify the mains cable or the plug. Failure to do so
could result in electric shock/death or fire. If in doubt, seek advice from a regis‐
tered electrician.
Safety instructions
power amplifier
8

CAUTION!
Possible hearing damage
With loudspeakers or headphones connected, the device can produce volume
levels that may cause temporary or permanent hearing impairment.
Do not operate the device permanently at a high volume level. Decrease the
volume level immediately if you experience ringing in your ears or hearing
impairment.
NOTICE!
Risk of fire
Do not block areas of ventilation. Do not install the device near any direct heat
source. Keep the device away from naked flames.
Safety instructions
S-75 • S-100 • S-150
9

NOTICE!
Operating conditions
This device has been designed for indoor use only. To prevent damage, never
expose the device to any liquid or moisture. Avoid direct sunlight, heavy dirt, and
strong vibrations.
NOTICE!
Power supply
Before connecting the device, ensure that the input voltage (AC outlet) matches
the voltage rating of the device and that the AC outlet is protected by a residual
current circuit breaker. Failure to do so could result in damage to the device and
possibly injure the user.
Unplug the device before electrical storms occur and when it is unused for long
periods of time to reduce the risk of electric shock or fire.
Safety instructions
power amplifier
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NOTICE!
Magnetic fields
The device generates strong magnetic fields that can interfere with the function
of poorly shielded devices. The strongest magnetic fields are directly above and
below the power amplifier. Therefore, never place sensitive devices such as pre-
amplifiers, radio transmission systems, or tape decks directly above or below the
power amplifier. When installing the power amplifier into a rack, you should place
it in the lowest position, and further equipment such as pre-amplifiers in the
highest position.
Safety instructions
S-75 • S-100 • S-150
11

3 Connections and operating elements
Front panel
Connections and operating elements
power amplifier
12

1CH-1: Input level controller for channel 1
Use the input level controllers CH-1 and CH-2 (4) on the front panel to control the
signal amplification in the respective channel. If possible, turn this control fully to
the right stop (= 0 dB attenuation) for optimal headroom. Professional power
amplifiers then output their rated power, if the input voltage is 0.775 V resp. 1.4 V
(depending on the position of the switch for the input sensitivity [19]).
2/3 PEAK: Indicator for signal and maximum level
These LED chains indicate the output power of the device in the respective
channel. The PEAK indicator lights up when the output power reaches its max‐
imum. If this indicator lights up continuously, the volume of the respective channel
must be reduced. To do so, turn to the input level knob counter-clockwise.
4CH-2: Input level controller for channel 2
Input level controller for channel 2, functionality is equal to point (1).
Connections and operating elements
S-75 • S-100 • S-150
13

5PRO: Indicator for activated protection circuit
This indicator lights up, if one of the following situations arises in one of the chan‐
nels:
• 3-5 seconds after switching on, as the speakers are still electrically disconnected
from the power amp.
• The temperature of the output transistors exceeds 85 °C.
• A malfunction exists in the device.
6BR: Indicator for mono operation in bridged mode
Please read more about the available operating modes in chapter Ä ‘Possible opera‐
tion modes’ on page 27.
7PAR: Indicator for mono operation in parallel mode
Please read more about the available operating modes in chapter Ä ‘Possible opera‐
tion modes’ on page 27.
Connections and operating elements
power amplifier
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8POWER: Power indicator light
Lights up when the unit is turned on.
9POWER: On / off switch (9)
This switch turns the power on and off. When switching on the protection circuits
are activated. After a few seconds you will hear two "clicks" - now the speakers are
electrically connected to the amplifier and the device is ready to operate.
When switching on electronic devices, especially power amps, the power con‐
sumption is particularly high. Make sure you don't turn on too many devices simul‐
taneously. Otherwise, the power supply circuit may be overloaded and the RCD will
disconnect the power supply.
Connections and operating elements
S-75 • S-100 • S-150
15

Rear panel
Connections and operating elements
power amplifier
16

10 Mains connector with fuse holder
Connect the supplied power cord here and supply the device with mains voltage.
11/12 Speaker outputs CH-1/2
Connect speakers to the speaker outputs of channel 1 and 2 using SPK cables
(wiring = 1+ 2+ 1– 2–)
13/14 Speaker terminals CH-1/2
You can connect the speakers either with cable lugs or bare wire to the cable termi‐
nals on the rear panel.
15 Ground/Lift switch
In normal operation signal source and power amplifier should share the same
ground potential. In some constellations this admittedly leads to ground loops and
thus to humming. If this happens vary the toggle switch setting for ground poten‐
tial on the rear panel of the unit. This switch connects in one setting the shield/
ground of the input signal with the housing of the power amp and thus with mains
earthing. In the other setting there is no electrical connection between the shield/
ground of the input signal and the power amp housing.
Connections and operating elements
S-75 • S-100 • S-150
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16 STE / PAR / BR
Use this switch to select the operating mode of the power amp: stereo (STE), par‐
allel (PAR) or bridged (BR).
17 CH-2
Connect the line-level signals to be amplified to the 1/4" balanced TRS phone jack
input of Channel 2 using a 1/4" phone jack cable.
18 CH-2
Connect the line-level signals to be amplified to the XLR input of Channel 2 using a
XLR cable.
19 0.77 V | 1.4 V
Use this switch to adjust the input level at which the power amplifier should deliver
its rated output power, "0.77 V" for units with -10 dBV outputs, or "1.4 V" for con‐
necting devices with +4 dBu outputs. Often multiple amplifiers are used simultane‐
ously. If you switch to the "26 dB" position, the signal will be amplified by all amps
equally. Thus, you can combine different power amps of the S-series, and always
get the same output level.
Connections and operating elements
power amplifier
18

20 CH-1 (MONO)
Connect the line-level signals to be amplified to the XLR input of Channel 1 using a
XLR cable.
21 CH-1 (MONO)
Connect the line-level signals to be amplified to the 1/4" balanced TRS phone jack
input of Channel 1 using a 1/4" phone jack cable.
22 Switch for power supply voltage
Before connecting the amplifier to the mains power supply, ensure that the mains
voltage switch on the bottom side (or rear side for S-150) is in the position that cor‐
responds to the actual power available (in Germany AC 230 V). If in doubt, consult
an electrician.
Connections and operating elements
S-75 • S-100 • S-150
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4 Installation and starting up
Unpack and check carefully there is no transportation damage before using the unit.
Establish all connections as long as the unit is switched off. Use the shortest possible high-
quality cables for all connections.
DANGER!
Electric shock caused by high voltages at the power amplifier output
The output voltages of modern high-performance amplifiers may result in death
or serious injury.
Never touch the bare ends of loudspeaker cables when the amplifier is on.
Installation and starting up
power amplifier
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