S-75 MK II, S-100 MK II, S-150 MK II power amplifier user manual
Musikhaus Thomann Thomann GmbH Hans-Thomann-Straße 1 96138 Burgebrach Germany Telephone: +49 (0) 9546 9223-0 E-mail: info@thomann.de Internet: www.thomann.de 07.07.
Table of contents Table of contents 1 General information................................................................................................................................. 1.1 Further information........................................................................................................................... 1.2 Notational conventions.................................................................................................................... 1.3 Symbols and signal words.....
General information 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.
General information 1.1 Further information On our website (www.thomann.de) you will find lots of further information and details on the following points: Download This manual is also available as PDF file for you to download. Keyword search Use the search function in the electronic version to find the topics of interest for you quickly. Online guides Our online guides provide detailed information on technical basics and terms.
General information 1.2 Notational conventions This manual uses the following notational conventions: Letterings The letterings for connectors and controls are marked by square brackets and italics. Examples: [VOLUME] control, [Mono] button. Cross-references References to other locations in this manual are identified by an arrow and the specified page number. In the electronic version of the manual, you can click the cross-reference to jump to the specified location.
General information 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.
General information Warning signs Type of danger Warning – danger zone.
Safety instructions 2 Safety instructions Intended use This device amplifies 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.
Safety instructions 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.
Safety instructions 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 specified in the chapter ‘Technical specifications’ of this user manual.
Safety instructions 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 trans‐ mission systems, or tape decks directly above or below the power amplifier.
Features 3 Features n n n n n n Output power 2 × 45 W to 250 W (depending on the model) Speaker Twist and terminal connections for speakers All protection circuits incl.
Connections and operating elements 4 Connections and operating elements Front panel power amplifier 14
Connections and operating elements 1 CH-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]).
Connections and operating elements 5 PRO: 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.
Connections and operating elements 8 POWER: 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. 9 POWER: On / off switch (9) Use this mains switch to turn the device on or off. When switching on, the protec‐ tion circuits are activated.
Connections and operating elements Rear panel + , - . / 1 2 0 OUTPUT 45 3 INPUT ERP ON OFF F:T5AL 250V (230V~) F:T10AL 250V (115V~) 115V/230V ~, 50/60Hz 8 CH-2 + CH-1 - CH-2 CH-1 .
Connections and operating elements 10 Mains connector with fuse holder Connect the supplied power cord here and supply the device with mains voltage. 11 ERP ON | OFF On / off 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–).
Connections and operating elements 16 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.
Connections and operating elements 20 0.77V | 1.4V | 26dB The input sensitivity at which the amplifier is delivering its full rated power, can be set with this switch between 0.775 VRMS and 1.4 VRMS). Often multiple amplifiers are used simultaneously. In this case, switch to the ‘26 dB’ position, the signal will then be amplified by all amps equally. Thus, you can combine different power amps of the S-series, and always get the same output level.
Installation and starting up 5 Installation and starting up Unpack and check carefully there is no transportation damage before using the unit. Keep the equipment packaging. To fully protect the product against vibration, dust and moisture during transportation or storage use the original packaging or your own packaging material suitable for transport or storage, respectively. Create all connections while the device is off. Use the shortest possible high-quality cables for all connections.
Installation and starting up 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. 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.
Installation and starting up Rack mounting Model types S-75 and S-100 The unit has been designed for rack mounting in a standard 19" rack; it occupies one rack unit. Model type S-150 The device is designed for mounting in 19" racks, it occupies two rack units (RU).
Installation and starting up 5.1 Tips on handling speakers We recommend you to set up the speakers in a way, that the sound signals can reach the audi‐ ence unobstructedly. It will often be helpful to mount the speakers on tripods. Thus, the sound will be evenly spread with maximum range throughout the audience area. Always use high grade cable to connect your equipment. Otherwise you won't reach max‐ imum sound quality.
Installation and starting up 5.2 Additional useful tips Possible operation modes Depending on the individual application, the amplifier can be used in different operation modes: Stereo mode The two amplifier channels operate independently of one another, either channel (CH1 and CH2) is amplified and connected to loudspeakers, the volume can be con‐ trolled separately for the two outputs.
Installation and starting up The two amplifier channels are internally connected in such a way that twice the output power is available. Only the input signal from channel CH1 is amplified and loudspeakers are connected only to the correspondingly marked output. The volume is controlled by the volume control of CH1. For each output of the amplifier, the total impedance resulting from the loudspeakers con‐ nected to it must not be below the allowed minimal impedance of the amplifier output.
Technical specifications 6 Technical specifications Model type S-75 S-100 S-150 Amplifier class AB AB AB Input impedance 20 kΩ (active, balanced) Input level 21 dBV / 9 V Output power RMS8 Ω, stereo 2 × 45 W 2 × 65 W 2 × 85 W RMS 4 Ω, stereo 2 × 75 W 2 × 100 W 2 × 150 W RMS 8 Ω, bridged 150 W 200 W 250 W > 80 dB > 85 dB 35 V/µs 40 V/µs Frequency response 10 Hz … 50 kHz, –1.
Technical specifications Model type S-75 Crosstalk @ rated power (1 kHz, 8 Ω) > 70 dB Power consumption Typical current consumption depending on the output power level (ARMS). All values based on a 230 V mains voltage and a 1 kHz input signal at 0 dB (sine).
Technical specifications Model type S-75 S-100 S-150 Ambient conditions Temperature range 0 °C…40 °C Relative humidity 20 %…80 % (non-con‐ densing) Further information Model type S-75 S-100 S-150 Power 4 Ω / channel 75 W 100 W 150 W Channels 2 2 2 2 Ω stable No No No DSP / frequency No No No Convection cooling Yes Yes Yes power amplifier 30
Plug and connection assignment 7 Plug and connection assignment Introduction This chapter will help you select the right cables and plugs to connect your valuable equip‐ ment in such a way that a perfect sound experience is ensured.
Plug and connection assignment Since the interference affects both cores equally, by subtracting the phase-shifted signals, the interfering signal is completely neutralized. The result is a pure signal without any noise inter‐ ference.
Plug and connection assignment 1/4" TRS phone plug (stereo, unbalanced) 1 Signal (left) 2 Signal (right) 3 Ground 1 Signal 2 Ground 1/4" TS phone plug (mono, unbalanced) S-75 MK II, S-100 MK II, S-150 MK II 33
Plug and connection assignment 3.
Plug and connection assignment XLR plug (balanced) 1 Ground, shielding 2 Signal (in phase, +) 3 Signal (out of phase, –) 4 Shielding on plug housing (option) 1 Ground, shielding 2 Signal 3 Bridged to pin 1 XLR plug (unbalanced) S-75 MK II, S-100 MK II, S-150 MK II 35
Plug and connection assignment Speaker Twist chassis connector # 1, + Signal 1 (in phase) 1, – Signal 1 (out of phase) 2, + Signal 2 (in phase) 2, – Signal 2 (out of phase) ö power amplifier 36
Cleaning 8 Cleaning Fan grids The fan grids of the device must be cleaned of any contamination, such as dust, etc. on a reg‐ ular basis. Before cleaning, switch off the device and disconnect mains-operated devices from the mains. Only use pH-neutral, solvent-free and non-abrasive cleaning agents. Clean the unit with a slightly damp lint-free cloth.
Protecting the environment 9 Protecting the environment Disposal of the packaging mate‐ rial For the transport and protective packaging, environmentally friendly materials have been chosen that can be supplied to normal recycling. Ensure that plastic bags, packaging, etc. are properly disposed of. Do not just dispose of these materials with your normal household waste, but make sure that they are collected for recycling. Please follow the notes and markings on the packaging.
Musikhaus Thomann · Hans-Thomann-Straße 1 · 96138 Burgebrach · Germany · www.thomann.
