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BA250H
bass head
user manual
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Musikhaus Thomann e.K.
Treppendorf 30
96138 Burgebrach
Germany
Telephone: +49 (0)9546 9223-0
email: info@thomann.de
Internet: www.thomann.de
16.11.2011
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Table of contents
1 General notes............................................................................................................................................... 4
2 Safety instructions..................................................................................................................................... 7
3 Installation and operation.................................................................................................................. 11
4 Components and functions................................................................................................................ 14
5 Technical specifications....................................................................................................................... 22
6 Protecting the environment.............................................................................................................. 24
Table of contents
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1 General notes
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 are subject to a process of continuous development. We therefore reserve the
right to make changes without notice.
This section gives 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 possible dangerous situation that
can result in minor injury if it is not avoided.
NOTICE! This combination of symbol and signal word
indicates a possible dangerous situation that
can result in material and environmental
damage if it is not avoided.
Warning signs Type of danger
Warning – high-voltage.
General notes
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Warning signs Type of danger
Warning – danger zone.
General notes
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2 Safety instructions
Use the device only as described in this user manual. Any other use or use under other oper‐
ating 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!
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
Safety instructions
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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.
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 block areas of ventilation. Do not install the device near any direct heat
source. Keep the device away from naked flames.
Safety instructions
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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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3 Installation and operation
Unpack and check carefully there is no transportation damage before using the unit.
Establish all connections as long as the unit is switched off. Use the shortest possible highquality cables for all connections.
A male XLR panel connector is used for the signal output (LINE OUT). The figure and the table
below show the pin assignment of a corresponding female XLR connector.
1 Ground
2 Signal (+)
3 Signal (–)
XLR connector for signal output
Installation and operation
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The figure and the table show the pin assignment of the 1/4-inch (6.35-mm) monaural jack
plug.
1 Signal
2 Ground
The figure and the table show the pin assignment of the 1/4-inch (6.35-mm) stereo jack plug.
Jack plug for loudspeaker con‐
nection and signal input
Jack plug for footswitch
Installation and operation
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1 Function 1
2 Function 2
3 Ground
The following figure shows the pin assignment of the lockable speakON panel connector.speakON connector for loud‐
speaker connection
Installation and operation
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4 Components and functions
Front panel
Components and functions
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1 ACTIVE/PASSIVE
Pressed: Connect with a passive bass guitar.
Not pressed: Connect with an active bass guitar.
2 INPUT
1/4-inch (6.35-mm) monaural jack for the input signal from your bass guitar.
3 POWER
The LED lights green when the amplifier turns on. It lights red when the power amplifier is clipping. In this case, turn down the
volume using the "MASTER" control (17).
4 CLIP
This LED lights when the pre-amplifier is overdriving. In this case, turn down the gain using the "GAIN" control (5).
5 GAIN
Control to adjust the pre-amplifier gain level.
Components and functions
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6 BOOST
Push-button to boost low frequencies. The control LED lights when this function is activated.
7 LOW
Control to cut or boost low frequencies by ±12 dB
8 BRIGHT
Push-button to boost high frequencies. The control LED lights when this function is activated.
9 HIGH
Control to cut or boost high frequencies by ±12 dB
10 EQ
Push-button to activate the 6-band graphic equalizer. The control LED lights when the equalizer is activated.
11 6-band graphic equalizer for sound adjustment. The equalizer operates at mid-range frequencies of 50 Hz, 120 Hz, 400 Hz,
800 Hz, 3,2 kHz, and 10 kHz. By means of the slide controls, these frequencies can be individually boosted or cut by ±12 dB.
12 COLOR
Push-button to activate the timbre control (13). The control LED lights when this function is activated.
With a footswitch connected, the "COLOR" control has no function.
Components and functions
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13 COLOR
Timbre control – from vintage to modern.
14 CONTOUR
Push-button to activate the contour control. The control LED lights when this function is activated.
15 CONTOUR
Contour control to decrease mid-range frequencies while boosting low and high frequencies.
16 MUTE
Push-button to mute the outputs for loudspeaker and LINE. The headphones output stays active. The control LED lights when
this function is activated.
With a footswitch connected, the "MUTE" control has no function.
17 MASTER
Control for the overall volume. To avoid signal clipping, monitor the "POWER" LED (3) while adjusting the volume.
Components and functions
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18 PHONES
¼-inch (6.35-mm) headphone jack. With headphones connected, the "SPEAKER OUT" and "LINE OUT" outputs are muted.
To avoid noise and distorted sound signals, turn down the volume using the "MASTER" control (17) before inserting or
removing the headphone plug.
19 AUX IN
Additional signal input that is fed in after the sound control and the equalizer. Use the "MASTER" control (17) to adjust the
volume.
Components and functions
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Rear panel
Components and functions
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20 TUNER OUT
¼-inch (6.35-mm) monaural jack socket for a tuner.
21 FOOTSWITCH
¼-inch (6.35-mm) stereo jack to connect an optional double footswitch for the "MUTE" and "COLOR" functions.
22 LINE OUT
Male XLR panel connector as signal output for direct connection with a mixer, other power amplifiers or a recording device.
GND LIFT
If a ground loop causes hum, use this switch to disconnect the ground line of LINE OUT.
23 Fan
The fan speed varies according to the chassis inside temperature. Do not block the fan.
24 SPEAKER OUT
Loudspeaker output, the signal is available in parallel on both a ¼-inch (6.35-mm) monaural jack and a lockable speakON
panel jack.
Components and functions
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25 POWER
Power on/off switch. Switches the unit on and off.
26 AC INPUT
Plug for mains cable with fuse holder
Components and functions
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5 Technical specifications
Input
–40 dBu at 1 MΩ; ¼-inch (6.35-mm) jack
Gain +33 dB max.
Low-frequencies control
±12 dB at 100 Hz
High-frequencies control
±12 dB at 10 kHz
Equalizer
±12 dB at 50 Hz, 120 Hz, 400 Hz, 800 Hz, 3,2 kHz, and 10 kHz respectively
Color control
700 Hz…20 kHz
AUX input
–10 dBu at 22 kΩ; ¼-inch (6.35-mm) jack
Headphones output
20 mW at 32 Ω; ¼-inch (6.35-mm) jack
Loudspeaker output
250 W at 4 Ω, 125 W at 8 Ω; ¼-inch (6.35-mm) jack and speakON panel jack
Line Out Balanced male XLR panel connector
Input voltage 230 VAC, 50 Hz
Fuse 5 A / 250 V, slow
Technical specifications
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Dimensions (W × D × H) 12.24 in × 9.96 in. × 2.52 in. (311 mm × 253 mm × 64 mm)
Weight 7.05 lbs (3.2 kg)
Technical specifications
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6 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 these materials with your normal household waste, but make sure that
they are fed to a recovery. Please follow the notes and markings on the packaging.
This device is subject to the European directive 2002/96/EC.
Do not dispose the device with your normal household waste.
Dispose 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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Notes
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Notes
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Musikhaus Thomann e.K. · Treppendorf 30 · 96138 Burgebrach · Germany · www.thomann.de
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