User's manual K&F PASSIO
KLING & FREITAG GMBH © 2012 Revision 2.2 Page 11 of 24
3.4 Protecting�the�Speakers�/�Operating�Safety
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. not_found
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 600W@8Ω.
• If power amplifiers have power ratings lower than 300W@8Ω, 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 24dB/oct. at 60Hz 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
• 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 con-nected, 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).