K&F SONA 8 Operating Instructions Manual
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Contents
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Operating Instructions K&F SONA 8KLING & FREITAG GMBH © 2016 Version 1.4 Page 7 of 213.3 Preventing Hearing DamageCautionKeep your distance from operating speakers. This equipment is capable of delivering soundpressure levels in excess of 90 dB SPL, which may cause permanent hearing damage.3.4 Protecting the Speakers / Operating SafetyIn 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. When a poweramplifier is overloaded at the output (clipping), then the amplifier should activate a clippingwarning signal. Power amplifiers can also be overloaded at the input circuit without theamplifier signalling the clipping, i.e. when there is not sufficient headroom in the inputcircuit. We, therefore, recommend turning up the power amplifiers all the way and adjustingthe level before the power amplifier in order to avoid overloading the input circuit. In anycase, the signal must be reduced as soon as it sounds unnaturally distorted.Operations without CD 44 Controller:• To protect the speakers from being destroyed and to avoid fire hazard, they shouldonly be operated with professional power amplifiers with a maximum rated outputpower of 500 W @ 8 Ohm.• If power amplifiers have power ratings lower than 250 W @ 8 Ohm, then it isimperative that the amplifiers have clipping limiters. Alternately, you can also insert aclipping limiter before the amplifier.• To protect the loudspeaker from mechanical damage when high SPL is required ahighpassfilter of 24 dB/oct. at 60 Hz has to be inserted into the signal chain.Operations with CD 44 Controller:• For optimal performance and operating safety of the SONA 8 speakers we recommendusing the system controller K&F CD 44.• When operating the loudspeaker with amplifers without clipping limiter and nominalamplifier power less than 100 W requires to set a Limit Reduction of 3 dB for the K&FCD 44 controller. You can find more detailed information about this option in theK&F CD 44 hardware operating instructions.• The destruction of speakers and the risk of fire as a result of a very rare poweramplifier or speaker defect may not be avoided by the controller in any case.For damage caused by• overloading the speakers or• using power amplifiers with other than the recommended maximum output powerwe 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. |
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