SA 33
mixer 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
04.09.2015, ID: 277393
Table of contents
1 General notes............................................................................................................................................... 4
2 Safety instructions..................................................................................................................................... 6
3 Features....................................................................................................................................................... 12
4 Installation and starting up................................................................................................................ 13
4.1 Pin assignment.................................................................................................................................. 14
4.2 Screw terminal bar........................................................................................................................... 16
5 Connections and operating elements........................................................................................... 18
6 Technical specifications....................................................................................................................... 23
7 Cleaning....................................................................................................................................................... 25
8 Protecting the environment.............................................................................................................. 26
Table of contents
SA 33
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1 General notes
This user manual contains important information on 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 other users, 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 provides an overview of the symbols and signal words used in this user manual.Symbols and signal words
General notes
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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.
Warning – danger zone.
General notes
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2 Safety instructions
This device is intended to be used for amplification, mixing and playback of signals from
musical instruments and microphones. Use the device only as described in this user manual.
Any other use or use under other operating 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.
Intended use
Safety instructions
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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.
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.
Safety
Safety instructions
SA 33
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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.
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
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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 cover the device nor any ventilation slots. Do not place the device near
any direct heat source. Keep the device away from naked flames.
Safety instructions
SA 33
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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
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NOTICE!
Possible damages by using an external battery
Improper handling may cause an arc or short circuit between the bare ends of a
live power cable to an external battery. This can destroy the battery and there is a
fire hazard!
If you use an external battery for power supply, connect the power cord to the
screw terminal on the rear panel first. Then connect the free ends of the cables to
the battery poles. Pay attention to the polarity marking! To disconnect the bat‐
tery, unscrew the cables on the battery first, then on the terminals of the device.
Also pay attention to the safety instructions of the battery manufacturer.
Safety instructions
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3 Features
n Two front panel microphone inputs
n AUX/PHONO input
n Input for an external preamp
n Output for an external power amp
n Screw terminals for the connection of speakers and off-grid voltage supply
Features
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4 Installation and starting up
Unpack and carefully check that there is no transportation damage before using the unit. Keep
the equipment packaging. To fully protect the device against vibration, dust and moisture
during transportation or storage use the original packaging or your own packaging material
suitable for transport or storage, respectively.
Establish all connections as long as the unit is switched off. Use the shortest possible highquality cables for all connections.
Installation and starting up
SA 33
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4.1 Pin assignment
Drawings and tables indicate the pin assignment of 1/4" phone plugs to be used.
Unbalanced wiring of a TS plug:
1 Signal
2 Ground, shielding
Phone sockets for signal inputs
Installation and starting up
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Unbalanced wiring of a TRS plug:
1 Signal
2, 3 Ground, shielding
Balanced wiring of a TRS plug:
1 Positive signal (+)
2 Negative signal (–)
3 Ground, shielding
Installation and starting up
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4.2 Screw terminal bar
All speakers and the battery for the off-grid voltage supply are connected via a screw terminal
bar on the rear panel of the unit.
First, remove the cover of the screw terminal using a suitable screwdriver. Loosen the terminal
screws required (see wiring diagram) and attach the desired cables with the screwdriver.
Installation and starting up
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Finally, check all cable connections for tightness and replace the cover of the screw terminal
on the unit.
Installation and starting up
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5 Connections and operating elements
Front panel
Connections and operating elements
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1 / 2 MIC 1 / 2
Microphone inputs 1 and 2 (1/4" phone socket) with volume control. MIC 1 signal has priority, so the MIC 1 signal
superimposes the MIC 2 signal.
3 AUX/PHONO
Volume control for the AUX/PHONO input on the rear panel of the unit.
4 MASTER
Volume control for the signal output of the mixer amplifier.
5 PL LED
Lights up when the device is switched on and operational.
6 Mains switch to turn the device on and off.
Connections and operating elements
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7 TREBLE
Control to increase or attenuate the high frequencies. Turn this knob from the middle position clockwise or counterclockwise to increase or attenuate the high frequencies by up to ± 10 dB.
8 BASS
Control to increase or attenuate the low frequencies. Turn this knob from the middle position clockwise or counterclockwise to increase or attenuate the low frequencies by up to ± 10 dB.
Connections and operating elements
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Rear panel
Connections and operating elements
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9 Operating voltage selector (115 V or 230 V, factory preset).
10 Indication of the factory preset operating voltage of the device (115 V or 230 V).
11 AUX — PHONO
Signal level selector for the AUX/PHONO input.
12 AUX/PHONO
RCA input sockets to connect an external audio device. Use the AUX — PHONO switch to adjust the signal level.
13 PRE OUT — AMP IN
These two RCA sockets are bridged by default. If required, you can use this loop to connect an equalizer or com‐
pressor. You can also feed the signal from the PRE OUT socket into an external power amp for further amplification.
14
Screw terminal bar to connect an external power supply and the speaker system(s), see Ä Chapter 4.2 ‘Screw terminal
bar’ on page 16.
15 GND
Connection screw for a grounding cable.
16 IEC chassis connector with fuse holder for operating voltage supply.
Connections and operating elements
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6 Technical specifications
Output power (RMS) 30 W (mains operation)
23 W (battery operation)
Frequency response
80 Hz … 18 kHz (±3 dB)
Input sensitivity MIC: –50 dB (unbalanced)
AUX: –20 dB
PHONO: –50 dB
Tone stack Treble: ±10 dB, 10 kHz
Bass: ±10 dB, 100 Hz
THD
£ 0,5 %
Signal-to-noise ratio
MIC: ³ 65 dB
AUX: ³ 75 dB
PHONO: ³ 55 dB
Technical specifications
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Output impedance COM, 4 Ω
Output voltage COM, 25 V, 70 V, 100 V
Operating voltage supply
AC 115/230 V , 50/60 Hz
DC 12 V
Power consumption 60 W (mains operation)
45 W (battery operation)
Dimensions (W × H × D) 280 mm × 75 mm × 190 mm
Weight 4.5 kg
Technical specifications
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7 Cleaning
The fan grids of the device must be cleaned on a regular basis to remove dust and dirt. Before
cleaning, switch off the device and disconnect AC-powered devices from the mains. Use a lintfree damp cloth for cleaning. Never use solvents or alcohol for cleaning.
Fan grids
Cleaning
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8 Protecting the environment
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.
This product is subject to the European Waste Electrical and Electronic Equipment Directive
(WEEE). Do not dispose with your normal household waste.
Dispose of this device through an approved waste disposal firm or through your local waste
facility. When discarding the device, comply with the rules and regulations that apply in your
country. If in doubt, consult your local waste disposal facility.
Disposal of the packaging mate‐
rial
Disposal of your old device
Protecting the environment
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Musikhaus Thomann · Hans-Thomann-Straße 1 · 96138 Burgebrach · Germany · www.thomann.de
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