t.amp S- 75 User manual

S- 75 • S-100 • S-150

Page 2
Device features
Fanless cooling, ideally suited for studiosX
Space saving design with only one rack spaceX
Works with a 2 Ω loadX
Efcient protective circuitryX
Balanced XLR and jackplug inputsX
Toggle switch for input sensitivityX
Parallel and bridged operations are possibleX
Speaker outputs for Speakon and terminalsX
Contents
Device features......................................................................................2
1. Introduction .......................................................................................3
2. Notes on safety..................................................................................4
3. Becoming acquainted with the operational components ..................5
4. Connection and operation ................................................................7
5. Operational safety precautions .........................................................8
6. Connecting the amplier ...................................................................8
7. Switching between modes ................................................................9
8. Selecting input sensitivity ...............................................................10
9. Switching on ...................................................................................10
10. Additional operational information ................................................10
11. Disposal ......................................................................................... 11
12. Technical Data ...............................................................................12

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Us e r Ma n U a l
These instructions do not provide all information regarding the device's design, production or possible
modications. It also does not cover every possible situation that can occur during installation, opera-
tion or maintenance. If you should require special assistance that is not covered by the information
given here please contact our technical support department.
PAY PARTICULAR ATTENTION TO THESE SYMBOLS:
This sybol, wherever it appears, warns of uninsulated power sources DANGEROUS
VOLTAGE inside the device so that a LIFE THREATENING situation from electrical
shock exists!
This symbol, wherever it appears, reminds you of SAFETY RELEVENT paragraphs of
these instructions and/or accompanying documents. Therefore READ THESE
INSTRUCTIONS!
1. Introduction
Congratulations on the purchase of your power amplier. Your choice shows that you enjoy excellent
sound reproduction. We are pleased by your purchase and are proud of the long tradition of quality,
high-class devices for which our company stands.
In order to get the best out of your amplier you should read the entire instructions before you con-
nect and put it into operation. The instructions will acquaint you with all the necessary information
for connection and operation so that your audience will listen with great pleasure from the start.
Thereby you will ascertain our efforts, during the design and production stages of the device, to
fulll your wishes and expectations regarding ease of use and adaptability.
Please keep these instructions for future reference.
Make a note of the device's serial number, located on the rear panel, here in the instructions.
Should you contact your dealer regarding further information or service for this device you will be
able to supply him/her with the model and serial numbers even when the device is mounted in the
rack.
MODEL__________________ Serial number__________________
FOR YOUR SAFETY YOU MUST READ THE CHAPTER "SAFETY INFORMATION" IN ANY
CASE.

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2. Notes on safety
For your own safety you should read through this chapter at rst completely!
Risk of electrical shocks.
Only connect the device to a properly wired and earthed mains power socket with mains voltage•
of 230 V ~ /50 Hz.
Do not operate the device if the power cord or the mains plug are damaged.•
Never submerse the device in water. Wipe it with a slightly moistened cloth only.•
Do not expose the device to rain and never use it in a damp or wet environment.•
Make sure that the power cord never becomes wet or moist during use.•
Under no circumstances may you open the device housing. Should you do so your safety would•
not be assured and the warranty will become void. There are no operational components whatso-
ever inside, only really high voltage that can give you a deadly shock!
Do not place objects containing uids, e.g. ower vases or beer bottles, on or near the device.•
Always operate the device only on a correctly earthed socket, never sever the power cord's•
earth wire. Otherwise a LIFE THREATENING situation exists!
Notice regarding disconnection from mains-power:•
To completely disconnect the device from mains power, you must pull the plug from the power
socket. For this reason the device should be placed in a position where unobstructed access to
the power socket is assured at all times, so that in an emergency you will be able to immediately
pull out the plug. To eliminate the risk of re you should completely disconnect the power plug from
the power socket when the device is not going to be used for a long time, for example, during
holidays.
Always grasp the power cord by the plug. Do not pull on the cord itself and never touch the power•
cord with wet hands as this could result in a short circuit or an electrical shock. Do not place the
device, speakers or anything else on the power cord and make sure that it does not become
clamped. Never tie knots in the power cord and do not bind it together with other cables. Lay the
power cord so that no one can step on or stumble over it. A damaged power cord can cause a
re or an electrical shock. Check the power cord from time to time. Should it become damaged
contact our customer service department to have it replaced.
Risk of re!
Never leave the device unattended during operation.•
Never cover the ventilation slots of the device while it is on. Do not place the device in locations•
that are subject to direct sunlight. If you do, it may overheat and become irreparably damaged.
Do not operate the amplier on surfaces that restrict normal airow around the device, for example, •
a bed, sofa, carpet or similar surfaces.
Do not place open re sources, such as candles, on the device.•
Never operate the amplier in the vicinity of heat sources such as cookers, heating elements or •
other heat producing installations.
Before a storm and/or a thunderstorm with a risk of lightning, please disconnect the device from•
the electrical power source.
Risk of personal injury!
Keep children away from the power cord and the device. Children frequently underestimate the•
dangers of electrical devices.
Provide a stable location for the device.•
Do not operate the device if it has sustained a fall or is damaged. Have the device checked or,•
if necessary, repaired by qualied technicians.

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3. Becoming acquainted with the operational components
3.1 . . . front
qCLIP Indicator for maximum level in channel 1
This indicator lights up when the output power of channel 1 has reached its
maximum value. If the indicator lights up continually the power in this channel
must be reduced. For this turn the input level controller for channel 1 w
counter clockwise.
wCH-1 Input level controller for channel 1
With this controller you decrease the input level in channel 1 to the respective
dB value indicated on the scale. At the right end stop the attenuation is "0"
and the full signal is amplied with maximum power.
eCLIP Indicator for maximum level in channel 2
This indicator lights up when the output power of channel 2 has reached its
maximum value. If the indicator lights up continually the power of this channel
must be reduced. For this turn the input level controller for channel 2 r
counter clockwise.

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rCH-2 Input level controller for channel 2
With this controller you decrease the input level in channel 2 to the respective
dB value indicated on the scale. At the right end stop the attenuation is "0"
and the full signal is amplied with maximum power.
tPRO Indicator for activated circuit protection
This indicator lights up when, in either of the two channels, one of the following
situations occurs:
• 3-5 seconds after switch on since now the speakers are still electrically
disconnected from the power amplier.
• The temperature of the power amplier transistors exceeds 85°C.
• There is a malfunction in the device.
yBR Indicator for bridged mono operation
In this case amplify both channels together with the signal at input 1.
This leads to a signicantly higher single channel output power.
Then do not connect any signals to channel 2.
uPAR Indicator for parallel mono operation
In this case amplify both channels with the signal at input 1.
The amplied signal from input 1 is applied to both outputs (CH-1 & CH-2).
iON Switch on indicator light
Lights up while the device is in operation.
oPOWER ON / OFF switch
Move this switch to the "I" position to switch the device on. During switch on
the circuit protection is activated. After a few seconds you will hear 2 "clicks"
now the speakers are electrically connected with the power amplier and the
device is ready.
3.2 . . . rear

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a Connection for the power cord/supply voltage (AC230V~/50Hz)
with fuse holder
sCH-2 Speakon speaker output channel 2,
for the connection of SPEAKON cables (1+ 2+ 1— 2—)
dCH-1 Speakon speaker output channel 1,
for the connection of SPEAKON cables (1+ 2+ 1— 2—)
fCH-2 Speaker terminals channel 2,
for terminal connection of speaker wires
gCH-1 Speaker terminals channel 1,
for terminal connection of speaker wires
hGROUND LIFT Toggle switch for earth potential
j (stereo, parallel, bridged) Operation mode toggle switch (stereo, parallel or bridged)
kCH-2 Jackplug input channel 2, symmetrical
lCH-2 XLR input channel 2
1( 0,77V | 1,4V Switch for input adjustment
2) CH-1 (MONO) XLR input channel 1
2! CH-1 (MONO) Jackplug input channel 1, balanced
4. Connection and operation
Unpacking
Carefully open the package and check the contents for possible damage. Every one of our ampliers
is completely tested and thoroughly checked before leaving the factory and should therefore reach
you in a faultless condition. If you should nd any kind of damage promptly notify the shipping com-
pany that transported the device to you. Only the consignee can assert a claim against the shipping
company for damages incurred during transportation. Therefore keep the package and all packaging
materials for their inspection. You should keep the package and packaging materials even if no
damage is present. Should you need, at some time, to ship the device, package it exclusively in
the original packaging.
Assembly
The power amplier has a housing that allows for installation in standard 19" racks provided this
exhibits a sufcient depth. The device requires one height unit, on the front panel you will see 4
assembly openings for screwing to the rack rails.
Important!
Keep these instructions for future reference.X
Do not spill water or any other liquids over or in the device. Never operate the amplier whenX
it is standing in a wet environment.
Make sure that the details for the supply voltage on the rear panel of the device correspondX
to the available supply voltage at the operation location. If in doubt ask an electrician.
Never apply a higher voltage to the device's input than that required for full drive.X
Never direct the output signal of one power amplier channel into the input of another power X
amplier channel.
You must never switch together the output of one amplier parallel or in series with the output X
of another amplier.
Never connect the output of an amplier with any kind of voltage source regardless of whether X
the amplier is in operation or not.
Never connect a red characterized connection with earth.X

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5. Operational safety precautions
Firstly make sure that the details for the supply voltage on the rear panel of the device correspond
to the available supply voltage at the operation location. If in doubt ask an electrician. Damages
sustained through operation of the device with incorrect supply voltage are not covered by our
warranty. Make sure that the power switch o is in the OFF position (O) before you carry out any
plug connections on the device.
It is also always worthwhile, when switching on, to return the input level controller w, rto the left
end stop so that the speakers will not be damaged by, for example, an unintentionally high signal
level at the input.
Always only use the best electrical outlets, which are also equal to the power requirements, for
power distribution to the devices. If the electrical outlets appear, for example, corroded or have
rusted contacts or they are equipped with cables that are too thin this will affect the performance
ability of the device.
Use only good speaker wires to minimize performance loss in the cables. If you want to connect
bare wires with the cable terminals it would be better if you rst attached cable shoes to the cable
ends.
To supply the inputs of the device with a signal we recommend the use of quality high grade shielded
cables which are provided with a properly soldered, good XLR plugs.
6. Connecting the amplier
Connecting the inputs
The balanced inputs have an impedance of 20 kΩ and are compatible with the Line-Level-Signals of
most devices. In the input you will nd three pin XLR sockets as well as balanced jackplug sockets.
The built in 1/4“ jackplug inputs can be used with balanced or unbalanced signal sources.
This is the standard set-up with jackplugs:
Stereo (unbalanced): Mono (unbalanced):

Page 9
Mono (balanced):
Connecting the speaker
You can connect the speakers either with cable shoes or also with bare wires to the cable terminals
on the rear panel of the device or you can use the Speakon sockets (1+ 2+ 1— 2—). The cable
prole should be proportioned to the amplier power and the cable length.
Connect the red cable terminal (+, hot) with the positive connection of the speaker and the black
terminal (—, earth) with the negative connection of the speaker.
You must NEVER connect the "hot" +pin of an amplier's output with the
black —pin of the same amplier (short circuit), or with the +pin of another
ampliers output. Switch the amplier off before you carry out connections
or disconnections.
Mains voltage supply
Before you connect the amplier to the mains voltage supply you must make sure that the mains
voltage switch, located on the underside of the device (resp. rearside for S-150), is in the position
that corresponds to the actual mains voltage supply (in Germany 230V~). If in doubt ask an electri-
cian.
Power supply
Only use the supplied mains cord to couple the connection for mains cord/Supply voltage awith
a properly connected and earthed (!) IEC household mains socket.
7. Switching between modes
With this mode toggle switch jlocated on the rear panel you determine the operating mode for the
power amplier, stereo, parallel or mono bridged. Never activate this switch when the device is
turned on.
Stereo operation
For two channel operation (stereo) slide the mode toggle switch jto the STEREO position. In stereo
operation both channels work independent from each other and the position of the corresponding
input level controller determines the respective power level. The signal at the respective input
(CH-1|CH-2) is amplied and is applied to the corresponding output.

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Parallel operation
The parallel mode works mono. It serves thereto, to be able to connect lower impedances (down
to 2 Ω) as in normal operation without thereby overloading the power amplier. For this you move
the mode toggle switch jto the "PARALLEL" position. In parallel operation you may only connect
the signal to the input CH-1. The device amplies the input signal in both channels and puts it out
jointly via the outputs "CH-1" and "CH-2". Then you connect the two positive "+" speaker connec-
tions together and the two negative "—" speaker connections together. Then you can connect, to
the device, one or more speakers.
Bridged mono operation
You can interconnect both power amplier channels (bridge) and in this way you get a really power-
ful single channel Power-Amp. For this you move the mode toggle switch jto the "BRIDGED"
position. In bridged mono operation both channels work together thus achieving effectively double
the performance of a single channel. Always be especially careful when operating bridged power
ampliers because then a higher voltage is applied to the output. Also always take into considera-
tion that the speakers must then have a considerably higher power rating!
You connect the signal to be amplied to the input CH-1. You connect one or more speakers to the
two red speaker terminals.
The red speaker connection of the channel CH-2 is thus "in Phase" with the input. That means:
Speaker "+"=> "+"Pole channel CH-2
Speaker "—"=> "+"Pole channel CH-1
When in operation you control the volume only with the input level controller CH-1 w, the input
level controller CH-2 rthen has no function. The input signal from channel CH-2 is disconnected
in this operational mode.
You must never earth either of the two speaker wire cores with bridged
operation since both cores are "hot". If you use a Patchbay on the output
side, all connections must be insulated from each other and from earth/
ground.
8. Selecting input sensitivity
Here you set the input level by which the power amplier should deliver its power rating "0,77V"
for devices with -10 dBV outputs or "1,4V" for connection of devices with +4 dBV outputs. Often
several ampliers are operated simultaneously. If you set this switch to „26db“, all connected ampli-
ers will ampliy the input signal with the same power. So you can combine different ampliers of
the S-series and get always the same output volume.
9. Switching on
Press the POWER switch oon the front panel to the "I" position to switch the device on. To switch
the device off again move the switch to the "O" position.
10. Additional operational information
Power controller
The input level controllers CH-1 wand CH-2 r on the front panel determine the signal amplica-
tion in the respective channel. If possible turn this controller all the way to the right end stop (= 0 dB
attenuation) in order to enable the system to achieve its optimal headroom. Professional power
ampliers then deliver their power rating so long as an input voltage of 0,775 V and/or 1,4 V
(depending on the switch setting for the input sensitivity) is applied.

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Signal Ground Lift Switch
In a system that, with reference to safety and low auxiliary noise, is optimally congured the power
amplier should be earthed at the input via the signal cable. If possible the signal source should
have at its disposal the same earth potential as the power amplier(s). In many constellations this
admittedly leads to ground loops and thus to humming. If this happens vary the toggle switch set-
ting for earth potential hon the rear panel of the device. This switch connects in one setting the
shield/earth of the input signal with the power amplier housing and thus the mains earthing. In the
other setting there is no electrical connection between the shield/earth of the input signal and the
power amplier housing.
Speaker protection
In spite of all these portrayed protection provisions you must also, as the operator of this device,
always keep in mind the limits of the speakers. Make sure that you never exceed the load limit of
the connected speaker with the power from your power amplier!
Avoid mains power overloads
When switching on the power draw of electronic devices, power ampliers in particular, is especially
high. Make sure that you do not switch on too many devices at the same time. Otherwise this will
overload the electric circuit supply and the fuses will blow.
11. Disposal
Never throw the device into the regular household waste at the end of its useful life.
This product is subject to the European Directive 2002/96/EC.
Dispose of the device through an approved disposal centre or at your community waste facility.•
Observe the current existing regulations. In case of doubt contact your disposal facility.•
The packaging is certied via a dual system. Take all packaging materials to an envi-•
ronmentally friendly disposal facility in compliance with the local regulations.

12. Technical Data
Model S-75 S-100 S-150
Output power stereo 8 Ω
4 Ω
2 Ω
bridged 8 Ω
4 Ω
parallel 2 Ω
1 Ω
2 x 45 W
2 x 75 W
2 x 90 W
150 W
220 W
160 W
2 x 65 W
2 x 100 W
200 W
200 W
2 x 85 W
2 x 150 W
2 x 200 W
250 W
400 W
320 W
Frequency response 10 Hz - 50 kHz, -1,5 dB
Input sensitivity 0,77 V / 26 dB / 1,4 V
Maximum input level 21 dBV / 9 V
Input impedance, active balanced 20 kΩ
Signal/noise ratio, A-weighted, RMS > 80 dB > 85 dB
Cross-talk @ power rating, 8 Ω, 1 kHz > 70 dB
Damping factor, f=1 kHz, 8 Ω > 150 dB
Slew rate 35 V/µS 40 V/µS
Protection circuits Current limit with short circuit, DC voltage fault,
fuse for supply voltage, limiter, temperature, mains
power transients
Slow Start
Control indicators Power (green), protection circuit (yellow),
clipping (red), bridged operation (green),
parallel operation (green)
Cooling fanless
Power consumption with half power, 8 Ω 65 W 100 W 120 W
Supply voltage 115 V / 230 V, 50-60 Hz
Dimensions (W x D x H) in mm 483 x 250 x 44 483 x 250 x 44 483 x 270 x 88
Our products are subject to a process of continual further development. Therefore modications to
the technical features remain subject to change without further notice.
Contact:
Musikhaus Thomann • Treppendorf 30 • 96138 Burgebrach • Germany
www.thomann.de