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User's Manual
In general, audio signals must not be overdriven. This may be caused by mixing consoles,
equalizers, effect equipment, etc. and should be indicated on this equipment. We, therefore,
recommend turning up the power amplifiers all the way and adjusting the level before the
power amplifier in order to avoid overloading the input circuit. In any case, the signal must
be reduced as soon as it sounds unnaturally distorted.
Operations without K&F SystemRack:
•
To protect the speakers from being destroyed and to avoid fire hazard, they should
only be operated with professional power amplifiers with a maximum rated output
power of 600 W @ 8 Ohm.
•
If power amplifiers have power ratings lower than 300 W @ 8 Ohm, then it is
imperative that the amplifiers have clipping limiters. Alternately, you can also insert a
clipping limiter before the amplifier.
•
Power amplifiers can also be overloaded at the input circuit without the amplifier
signalling the clipping, i.e. when there is not sufficient headroom in the input circuit.
•
To protect the loudspeaker from mechanical damage when high SPL is required a
highpassfilter of 24 dB/oct. at 60 Hz has to be inserted into the signal chain.
Operations with K&F SystemRack:
•
For optimal performance and operating safety of the PASSIO speakers we recommend
using the K&F SystemRack.
•
When a power amplifier is overloaded at the output (clipping), then the amplifier
activates a clipping warning signal.
For damage caused by
•
overloading the speakers or
•
using power amplifiers with other than the recommended maximum output power
we do not assume warranty and excludes liability for possible consequential damage.
The following signals may damage the speakers:
•
clipping power amplifiers
•
permanent high-level signals with high frequency and continuous noise from feedback,
•
permanently distorted high-level signals,
•
noises, which occur when the amplifier is on while equipment is being connected,
disconnected or switched on.
Do not install devices in any of the following places:
•
where the devices are permanently exposed to direct sunlight.
•
where the devices are exposed to high moisture or rain.
•
where the devices are exposed to strong vibrations and dust.
Avoid damage caused by the speakers' magnetic fields
Speakers are permanently surrounded by a magnetic field, even when they are not
connected. Therefore, during transport and placement of the speakers, it is important to
ensure that there is a sufficient distance between the speakers and magnetic data media and
computer/video monitors (except flat panels).
KLING & FREITAG GMBH © 2017
Version 3.0
K&F PASSIO
Page 8 of 26
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