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:
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.
19 Accessories
We recommend using low impedance
20 | Technical data |
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Receiving frequencies | 16 | ||
Frequency range | |||
Switching bandwidth | 24 MHz | ||
Modulation | stereo FM working on the | ||
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| “pilot tone” principle | |
Nominal/peak deviation | ± | 40 kHz/± 56 kHz | |
RF squelch | |||
Sensitivity (52 dB S/N) | 2 | µ V mono (typ.), | |
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| 10 µ V stereo (typ.) | |
Compander system | Sennheiser HiDyn stage | ||
AF frequency response | |||
typ. 87 dB(A) | |||
THD at 1 kHz and nominal deviation | 0.3 % mono (typ.), | ||
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| 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 |
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(nominal impedance) | 2 x 100 mW (typ.) at 1 kHz | ||
Min. terminating impedance | |||
Power supply | 9 | V PP3 battery | |
Operating time with alkaline battery | 5 hours with the volume set | ||
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| 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 | |
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| stereo receiver |
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| 1 | antenna |
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| 1 | attachment/belt clip |
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| 1 | 9 V PP3 battery |
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| 1 | instructions for use |
24 | 25 |
