Categories: Thomann

thomann Achat 108 Sub A Active Speaker User Manual

thomann Achat 108 Sub A Active Speaker

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

Further information

On our website ( 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.
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.

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.

Symbols and signal words

In this section, you will find an overview of the meaning of symbols and signal words that are used in this manual.

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 signs Type of danger
Warning – danger zone.

Safety instructions

Intended use

This device is designed for sound reinforcement. 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.


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.
    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.
    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 fire. If in doubt, seek advice from a registered electrician.
    Possible hearing damage The device can produce volume levels that may cause temporary or permanent hearing impairment. Over an extended period of time, even levels that seem to be uncritical can cause hearing damage. Decrease the volume level immediately if you experience ringing in your ears or hearing impairment. If this is not possible, keep a greater distance or use sufficient ear protectors.
    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.
    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. Avoid heavy temperature fluctuations and do not switch the device on immediately after it was exposed to temperature fluctuations (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 qualified service personnel at regular intervals to prevent overheating and other malfunction.
    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.
    Possible damage due to installation of a wrong fuse
    The use of different types of fuses can cause serious damage to the unit. Fire hazard! Only fuses of the same type may be used.
    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 floor and after some time cause permanent dark stains. In case of doubt, do not put the rubber feet directly on the floor, but use felt-pad floor protectors or a carpet.


Special features of the device:

  • Inputs: XLR / 1/4″ jack combo sockets, RCA sockets
  • Outputs: 2 lockable NL4 chassis connector for passive speaker boxes (Top)
  • 8″ woofer
  • Controls for volume and bass
  • Structure paint

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. Take care when running the cables to prevent tripping hazards.

Possible property damage by magnetic fields
Loudspeakers produce a static magnetic field. Therefore, maintain an appropriate distance to devices that can be adversely affected or damaged by an external magnetic field.

Pin assignment
NL4 mounting connectors for speaker connections 
The adjoining figure shows the pin assignment of the lockable NL4 panel connectors.

Jack plugs for signal inputsThe figure and the table show the pin assignment of the 1/4” jack plugs (mono).

  • Signal
  • Ground

XLR connectors for signal inputs

XLR / 1/4” jack combo sockets (balanced) are used for the signal inputs. The figure and the table show the XLR pin assignment.

  • Ground
  • Positive signal (+)
  • Negative signal (–)

RCA connectors for signal inputs

The figure and the table show the RCA plugs pin assignment.

  • Signal
  • Ground

Tips on handling speakers

We recommend you to set up the speakers in a way, that the sound signals can reach the audience 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 the high-grade cable to connect your equipment. Otherwise, you won’t reach maximum sound quality. For optimum results both impedance and power handling of the speakers must match the requirements of the amplifier. Always follow the technical specifications of the speakers! The overall impedance of the connected loudspeakers must not decreed the minimum output impedance of the amp. The amps max. RMS output power should be 50 % above the power handling capacity of the connected speakers. If you notice distortion during operation, either the amp or the speaker is overloaded. This may permanently damage the amp or the speaker. Always reduce the volume when you hear distortion.

Connections and operating elements


The indicator light indicates that the device is switched on and operational.

2 [SIG]

The indicator light indicates that an input signal is present.

3 [CLIP]

Indicates overload (clipping). In this case, the level of the input signal is too high.

4 [BASS]

Control for boosting / attenuating the low frequencies


Control for adjusting the master volume (built-in subwoofer and connected external loudspeakers)

6 Phasing switch. Shifts the phase of the subwoofer signal by 180 °, if necessary. This avoids unwanted cancellation effects in combination with other speakers.

Signal inputs, designed as RCA sockets


Signal inputs, designed as XLR / 1/4” jack combo sockets


Terminal connections for a pair of external, passive loudspeakers, designed as NL4 sockets

10 IEC chassis plug for power supply with fuse holder
11 [POWER]

Mains switch. Turns the device on and off.

Technical specifications

Speaker 1 × 8″ woofer
Input connections Input signal 1 × pair of XLR / 1/4″ jack combo sockets
Input signal 1 × pair of RCA sockets (L/R)
Power supply IEC chassis plug C14
Input impedance 20 kΩ (balanced), 10 kΩ (unbalanced)
Output connections Output signal 2 × lockable NL4 chassis connectors
Output power RMS: 100 W
Output for passive speaker (Top) 2 × 60 W (RMS) @ 4 Ω
Frequency range 40…125 Hz
Crossover frequency 120 Hz
Sound pressure level (SPL), max. 116 dB
Power consumption 275 W
Supply voltage 230 V     50 Hz
Fuse 5 mm × 20 mm, 3,5 A, 250 V, slow-blow
Dimensions (W × H × D) 360 mm × 300 mm × 436 mm
Weight 11.5 kg
Ambient conditions Temperature range 0 °C…40 °C
Relative humidity 20 %…80 % (non-condensing)

Further information

Multi-channel power amp yes
Number of woofers 1
High Cut Fixed
Stand flange No
Casters No
Suitable protective cover Item no. 514851 (not included)
Colour black (item no. 266719), white (item no. 302856)

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.

Disposal of your old device
This product is subject to the European Waste Electrical and Electronic Equipment Directive (WEEE) in its currently valid version. 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.

Documents / Resources

thomann Achat 108 Sub A Active Speaker [pdf] User Manual
Achat 108 Sub A, Active Speaker, Achat 108 Sub A Active Speaker



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