thomann the t.amp S-75 MK II User manual

S-75 MK II, S-100 MK II,
S-150 MK II
power amplier
user manual

Musikhaus Thomann
Thomann GmbH
Hans-Thomann-Straße 1
96138 Burgebrach
Germany
Telephone: [phone]
E-mail: [email protected]
Internet: www.thomann.de
07.07.2021, ID: 141140, 144356, 141141 (V5)

Table of contents
1 General information................................................................................................................................. 4
1.1 Further information........................................................................................................................... 5
1.2 Notational conventions.................................................................................................................... 6
1.3 Symbols and signal words............................................................................................................... 6
2 Safety instructions..................................................................................................................................... 9
3 Features....................................................................................................................................................... 13
4 Connections and operating elements........................................................................................... 14
5 Installation and starting up................................................................................................................ 22
5.1 Tips on handling speakers............................................................................................................ 25
5.2 Additional useful tips...................................................................................................................... 26
6 Technical specications....................................................................................................................... 28
7 Plug and connection assignment.................................................................................................... 31
8 Cleaning....................................................................................................................................................... 37
9 Protecting the environment.............................................................................................................. 38
Table of contents
S-75 MK II, S-100 MK II, S-150 MK II
3

1 General information
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 and user manuals are subject to a process of continuous development. We there‐
fore reserve the right to make changes without notice. Please refer to the latest version of the
user manual which is ready for download under www.thomann.de.
General information
power amplier
4

1.1 Further information
On our website (www.thomann.de) you will nd lots of further information and details on the
following points:
Download This manual is also available as PDF le for you to download.
Keyword search Use the search function in the electronic version to nd the topics of
interest for you quickly.
Online guides Our online guides provide detailed information on technical basics
and terms.
Personal consultation For personal consultation please contact our technical hotline.
Service If you have any problems with the device the customer service will
gladly assist you.
General information
S-75 MK II, S-100 MK II, S-150 MK II
5

1.2 Notational conventions
This manual uses the following notational conventions:
The letterings for connectors and controls are marked by square brackets and italics.
Examples: [VOLUME] control, [Mono] button.
References to other locations in this manual are identied by an arrow and the specied page
number. In the electronic version of the manual, you can click the cross-reference to jump to
the specied location.
Example: See Ä ‘Cross-references’ on page 6.
1.3 Symbols and signal words
In this section you will nd an overview of the meaning of symbols and signal words that are
used in this manual.
Letterings
Cross-references
General information
power amplier
6

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 pos‐
sible dangerous situation that can result in minor injury if it
is not avoided.
NOTICE! This combination of symbol and signal word indicates a pos‐
sible dangerous situation that can result in material and
environmental damage if it is not avoided.
Warning signs Type of danger
Warning – high-voltage.
General information
S-75 MK II, S-100 MK II, S-150 MK II
7

Warning signs Type of danger
Warning – danger zone.
General information
power amplier
8

2 Safety instructions
This device amplies electric audio frequency signals to operate passive speakers. Use the
device only as described in this user manual. Any other use or use under other operating con‐
ditions 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 sucient 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.
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 instructions
S-75 MK II, S-100 MK II, S-150 MK II
9

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. Do not use the device if covers, protectors or optical components are missing or damaged.
DANGER!
Electric shock caused by short-circuit
Always use proper ready-made insulated mains cabling (power cord) with a protective contact plug. Do not modify the mains cable
or the plug. Failure to do so could result in electric shock/death or re. If in doubt, seek advice from a registered electrician.
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 re
Do not block areas of ventilation. Do not install the device near any direct heat source. Keep the device away from naked ames.
Safety instructions
power amplier
10

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. Only operate the device within the ambient conditions specied in the chapter
‘Technical specications’ of this user manual. Avoid heavy temperature uctuations and do not switch the device on immediately
after it was exposed to temperature uctuations (for example after transport at low outside temperatures). Dust and dirt inside can
damage the unit. When operated in harmful ambient conditions (dust, smoke, nicotine, fog, etc.), the unit should be maintained by
qualied service personnel at regular intervals to prevent overheating and other malfunction.
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 re.
NOTICE!
Possible damage due to installation of a wrong fuse
The use of dierent types of fuses can cause serious damage to the unit. Fire hazard! Only fuses of the same type may be used.
Safety instructions
S-75 MK II, S-100 MK II, S-150 MK II
11

NOTICE!
Magnetic elds
The device generates strong magnetic elds that can interfere with the function of poorly shielded devices. The strongest magnetic
elds are directly above and below the power amplier. Therefore, never place sensitive devices such as pre-ampliers, radio trans‐
mission systems, or tape decks directly above or below the power amplier. When installing the power amplier into a rack, you
should place it in the lowest position, and further equipment such as pre-ampliers in the highest position.
NOTICE!
Possible staining
The plasticiser contained in the rubber feet of this product may possibly react with the coating of your parquet, linoleum, laminate
or PVC oor and after some time cause permanent dark stains. In case of doubt, do not put the rubber feet directly on the oor, but
use felt-pad oor protectors or a carpet.
Safety instructions
power amplier
12

3 Features
nOutput power 2 × 45 W to 250 W (depending on the model)
nSpeaker Twist and terminal connections for speakers
nAll protection circuits incl. soft start
nInput level switchable from –0 to +4 db
nFanless operation
nStandby function
Features
S-75 MK II, S-100 MK II, S-150 MK II
13

4 Connections and operating elements
Front panel
Connections and operating elements
power amplier
14

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 amplication in the respective channel. If possible, turn this control fully to
the right stop (= 0 dB attenuation) for optimal headroom. Professional power
ampliers 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 / maximum level
These LED chains indicate the output power of the device in the respective. The
PEAK indicator lights up when the output power reaches its maximum. If this indi‐
cator 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 MK II, S-100 MK II, S-150 MK II
15

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 26.
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 26.
Connections and operating elements
power amplier
16

8POWER: Power indicator light
Lights up green when the device is turned on. In standby mode, the LED lights red.
As soon as the unit receives a signal, it switches back to normal mode and the LED
will light up green again.
9POWER: On / o switch (9)
Use this mains switch to turn the device on or o. When switching on, the protec‐
tion circuits are activated. After a few seconds you will hear two ‘clicks’ - now the
speakers are electrically connected to the amplier and the device is ready to
operate.
When switching on electronic devices, especially power amps, the power con‐
sumption is particularly high. Make sure not to turn on too many devices simulta‐
neously. Otherwise, the power supply circuit may be overloaded and the RCD will
disconnect the power supply.
Connections and operating elements
S-75 MK II, S-100 MK II, S-150 MK II
17

+
ERP
ON OFF
115V~ 230V~
VOLTAGE SELECTION
115V/230V ~, 50/60Hz
F:T5AL 250V (230V~)
F:T10AL 250V (115V~)
CH-1
CH-1CH-2
CH-2
S-150 mk2
OUTPUT
INPUT
, - . 0
/21 3 4 6 7
5
ERP
ON OFF
115V/230V ~, 50/60Hz
F:T5AL 250V (230V~)
F:T10AL 250V (115V~)
CH-1 CH-1CH-2CH-2
OUTPUT INPUT
8 + - .
0
/
,
21 3 4 6 7 5
Rear panel
Connections and operating elements
power amplier
18

10 Mains connector with fuse holder
Connect the supplied power cord here and supply the device with mains voltage.
11 ERP ON | OFF
On / o switch for standby function. If the standby function is enabled, the device
automatically switches to standby mode after 20 minutes without any input signal.
12 / 13 Speaker outputs CH-1/2
Connect speakers to the speaker outputs of channel 1 and 2 using SPK cables
(wiring = 1+ 2+ 1– 2–).
14 / 15 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.
Connections and operating elements
S-75 MK II, S-100 MK II, S-150 MK II
19

16 GROUND/LIFT switch
In normal operation signal source and power amplier 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.
17 STE / PAR / BR
Use this switch to select the operating mode of the power amp: stereo (STE), par‐
allel (PAR) or bridged (BR).
18 CH-2
Connect the line-level signals to be amplied to the 1/4" balanced TRS phone jack
input of Channel 2 using a 1/4" phone jack cable.
19 CH-2
Connect the line-level signals to be amplied to the XLR input of Channel 2 using a
XLR cable.
Connections and operating elements
power amplier
20