Operating Instructions
K&F SONA SUB II
KLING & FREITAG GMBH © 2016
Version 1.5
Page 7 of 21
3.3
Preventing Hearing Damage
Caution
Keep your distance from operating speakers. This equipment is capable of delivering sound
pressure levels in excess of 90 dB SPL, which may cause permanent hearing damage.
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 (only option "XO"):
•
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 these operating
instructions. See chapter Configuration and Connecting Diagram from page 10.
Operations with CD 44 Controller:
•
For optimal performance and operating safety of the SONA SUB II 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 3 dB 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 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.
Summary of Contents for SONA SUB II
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