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3B SCIENTIFIC
Wide-Band Loudspeaker U8432770
Instruction sheet
02/09 ALF
®
PHYSICS
1. Safety instructions
The wide-band loudspeaker can generate extremely
high volumes of sound. Please note that high sound
pressures may cause temporary or even permanent
hearing damage.
• Be careful to select a suitable volume.
2. Description
The wide-band loudspeaker serves as a sound source
for acoustics experiments in the frequency range
from 60 Hz to 23 kHz.
The instrument is a two-channel loudspeaker with a
5½“ woofer and a ½“ tweeter. It has an exceptionally
broad uniform-power frequency range from 60 Hz to
23 kHz.
The loudspeaker incorporates an overload protection
circuit with automatic reset function to protect the
tweeter.
3. Technical data
Frequency range: 60 Hz to 23 kHz (-10 dB)
Power capacity: 100 W (as per IEC 268-5)
Impedance: 4 Ω
Tweeter: ½" diam.
Woofer: 5 ½" diam.
Crossover frequency: 5000 Hz
Connection: 4 mm safety jacks
Dimensions: 225 x 150 x 142 mm³
Weight: 1.8 kg approx.
4. Additionally recommended equipment
1 Sine wave generator U8533550
1 Transformer (230 V, 50/60 Hz) U8475430-230
or
1 Transformer (115 V, 50/60 Hz) U8475430-115
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5. Operation
• Do not connect the loudspeaker to a DC power
source.
Any base that is likely to experience even slight
vibration is not suitable for mounting a loudspeaker.
• Be sure to mount your speaker on a solid, stable
and level base.
• Do not use this apparatus near water.
• Make sure that no objects or liquids get through
the openings into the loudspeaker.
• Do not block any ventilation openings.
• Connect the low-frequency loudspeaker to the
sine wave generator.
• Set all the output controls of the sine wave
generator to zero (full left position).
• Connect the sine wave generator via the
transformer to the mains supply.
• Adjust the sine wave generator to obtain the
desired output (frequency and amplitude).
If you let your loudspeaker run at or near its power
limit, the integrated protective circuitry may
temporarily disconnect the tweeter. In this case,
there is no danger of causing permanent damage.
• Lower the amplitude to allow the tweeter to
automatically come online again.
6. Maintenance
Maintenance is required if the unit has been
damaged in any way, liquid has been spilled or
objects have fallen into the apparatus, if the unit has
been exposed to rain or moisture, is not operating
normally or has been dropped.
• Refer all service to qualified service personnel.
• Clean only with a dry cloth.
Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com
Subject to technical amendments
© Copyright 2009 3B Scientific GmbH
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