Attention! High Volume; Accessories; Technical Data - Sennheiser EK 3053-U Instructions For Use Manual

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Attention! High Volume!

This is a professional transmission system. Commercial use is subject to
the rules and regulations of the trade association responsible. Sennheiser,
as the manufacturer, is therefore obliged to expressly point out possible
health risks arising from use.
This system is capable of producing sound pressure exceeding 85 dB(A).
85 dB(A) is the sound pressure corresponding to the maximum
permissible volume which is by law (in some countries) allowed to
affect your hearing for the duration of a working day. It is used as a
basis according to the specifications of industrial medicine. Higher
volumes or longer durations can damage your hearing.
At higher volumes, the duration must be shortened in order to prevent
damage. The following simple formula applies:
Double the volume = half the duration
An increase of 3 dB corresponds to doubling the volume; you can thus
go by the following table:
Maximum duration
8 hours
4 hours
2 hours
1 hour
30 minutes
15 minutes
8 minutes
4 minutes
2 minutes
1 minute
Pain threshold
The following are sure signs that you have been subjected to excessive noise
for too long a time:
You can hear ringing or whistling sounds in your ears.
You have the impression (even for a short time only) that
you can no longer hear high notes.
After using this system, your hearing is impaired for a short
time.
In all of the above cases, you should consult a specialist or at least have
your hearing tested.
Ear damage builds up gradually. Once the initial symptoms have died
down, you no longer perceive acute changes. In the long term, however,
the repeated effects of loud noises can cause severe hearing impairment
or even deafness.
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at a sound pressure of:
85 dB
88 dB
91 dB
94 dB
97 dB
100 dB
103 dB
106 dB
109 dB
112 dB
120 dB
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Accessories

We recommend using low impedance in-ear headphones. To ensure
optimum sound, the in-ear headphones should be anatomically suited
to your individual ear shape.
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Technical data

Receiving frequencies
Frequency range
Switching bandwidth
Modulation
Nominal/peak deviation
RF squelch
Sensitivity (52 dB S/N)
Compander system
AF frequency response
Signal-to-noise ratio
THD at 1 kHz and nominal deviation
Stereo channel separation (at 1 kHz)
AF output (headphone)
AF output power at 2 x 32
(nominal impedance)
Min. terminating impedance
Power supply
Operating time with alkaline battery
Dimensions in mm
Weight incl. battery or accupack
In compliance with
Delivery includes
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450–960 MHz
24 MHz
stereo FM working on the
"pilot tone" principle
40 kHz/ 56 kHz
0–100 V, adjustable
2 V mono (typ.),
10 V stereo (typ.)
Sennheiser HiDyn stage
40–15,000 Hz
typ. 87 dB(A)
0.3 % mono (typ.),
0.6 % stereo (typ.)
45 dB
3.5 mm Ø stereo jack
2 x 100 mW (typ.) at 1 kHz
shortcircuit-proof
9 V PP3 battery
5 hours with the volume set
to a medium value
108 x 65 x 23
236 g
ETS 300 422, ETS 300 455
1 EK 3053-U
stereo receiver
1 antenna
1 attachment/belt clip
1 9 V PP3 battery
1 instructions for use
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