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6. Installation and operating instructions
6.1 Operating environment
1.
The permitted ambient temperature range during operation
extends from -5°C to +40°C.
2.
During storage or transportation, the temperature should be
between -15°C and +40°C.
3.
If dew forms on the rear panel of the unit during transportation
or storage, allow the unit to acclimatise for approx. 2 hours
before use.
4.
The speaker should be operated in a dry environment with
normal dust and moisture levels in the air. Do not expose the
unit to aggressive chemical liquids or vapours.
5.
You can set up the unit in any position. Please make sure
that the heat dissipation outlet on the rear connection panel
(cooler) is always clear.
6.2 Instructions for rack installation
The amplifier is fitted with corresponding mounting
brackets at the front and rear for professional installation
in mobile 19" racks and control cabinets. The housing
is distortion-resistant. Please make absolutely sure
that there is sufficient space at the front and rear of
the amplifier during operation to guarantee adequate
ventilation and cooling.
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6.3 Preventing feedback
If a microphone is used, acoustic feedback may occur and cause the
speaker to produce high-pitched whistling noises.
To avoid feedback:
1.
Make sure the person speaking stands behind the speaker
2.
Never point the microphone directly at the speaker
3.
Hold the handheld transmitter by the shaft. Do not cover the
microphone with your hand.
4.
Should the speaker start whistling or screeching, turn the
VOLUME control down CCW until the feedback stops.
6.4 Protection and maintenance
To ensure trouble-free operation, never expose the system to
extreme sunshine, high temperatures, moisture or dust for longer
periods. Avoid operating the unit when subjected to large vibrations
and never remove the speaker grille. If the unit is faulty, please
contact the Fohhn Audio AG service centre. Do not open the unit!
6.5 Preventing interference
Do not operate the system in the immediate vicinity of a radio or
television, as this may cause interference. When connecting to
other equipment, avoid so-called mains humming.
D-Series Amps | 17
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