Sennheiser EK 3053-U - Manual (Page 13)

25 24
19 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.
20 Technical data
Receiving frequencies 16
Frequency range 450–960 MHz
Switching bandwidth 24 MHz
Modulation stereo FM working on the
“pilot tone” principle
Nominal/peak deviation
±
40 kHz/
±
56 kHz
RF squelch 0–100
µ
V, adjustable
Sensitivity (52 dB S/N) 2
µ
V mono (typ.),
10
µ
V stereo (typ.)
Compander system Sennheiser HiDyn stage
AF frequency response 40–15,000 Hz
Signal-to-noise ratio typ. 87 dB(A)
THD at 1 kHz and nominal deviation 0.3 % mono (typ.),
0.6 % stereo (typ.)
Stereo channel separation (at 1 kHz)
≥
45 dB
AF output (headphone) 3.5 mm Ø stereo jack
AF output power at 2 x 32
Ω
(nominal impedance) 2 x 100 mW (typ.) at 1 kHz
Min. terminating impedance shortcircuit-proof
Power supply 9 V PP3 battery
Operating time with alkaline battery 5 hours with the volume set
to a medium value
Dimensions in mm 108 x 65 x 23
Weight incl. battery or accupack 236 g
In compliance with ETS 300 422, ETS 300 455
Delivery includes 1 EK 3053-U
stereo receiver
1 antenna
1 attachment/belt clip
1 9 V PP3 battery
1 instructions for use
18 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 at a sound pressure of:
8 hours 85 dB
4 hours 88 dB
2 hours 91 dB
1 hour 94 dB
30 minutes 97 dB
15 minutes 100 dB
8 minutes 103 dB
4 minutes 106 dB
2 minutes 109 dB
1 minute 112 dB
Pain threshold 120 dB
The following are sure signs that you have been subjected to excessive noise
for too long a time:
ƽ
You can hear ringing or whistling sounds in your ears.
ƽ
You have the impression (even for a short time only) that
you can no longer hear high notes.
ƽ
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.