KLING & FREITAG K&F SONA SUB - Manual (Page 8)

User's manual K&F SONA SUB
KLING & FREITAG GMBH © 2014 Version 2.1 Page 8 of 21
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. When a power
amplifier is overloaded at the output (clipping), then the amplifier should activate a clipping
warning signal. 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. 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 CD 44 Controller:
• 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 150W@8Ohm.
• If power amplifiers have power ratings lower than 75W@8Ohm, then it is imperative
that the amplifiers have clipping limiters. Alternately, you can also insert a clipping
limiter before the amplifier.
• To achieve sensible acoustic results and to protect the speaker from mechanical
destruction during use, the speaker must be filtered according to this manual. See
chapter Configuration and Connecting Diagram from page 13.
Operations with CD 44 Controller:
• For optimal performance and operating safety of the SONA SUB speakers we
recommend using the system controller K&F CD 44.
• When operating the loudspeaker with amplifers without clipping limiter and nominal
amplifier power less than 75W@8Ohm requires to set a Limit Reduction of 3dB for the
K&F CD 44 controller.
• The destruction of speakers and the risk of fire as a result of a very rare power
amplifier or speaker defect may not be avoided by the controller in any case.
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 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).