User's manual
K&F SONA SUB
KLING & FREITAG GMBH © 2010
Revision 1.2
Page 8 of 21
3.4
Protecting�the�Speakers�/�Operating�Safety
Important
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 over-
loaded 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 over-
loading the input circuit. In any case, the signal must be reduced as soon as it sounds unnaturally dis-
torted.
Operations�without�CD�44�Controller:
•
To protect the speakers from being destroyed and to avoid fire hazard, they should only be oper-
ated with professional power amplifiers with a maximum rated output power of 150W@8Ω.
•
If power amplifiers have power ratings lower than 75W@8Ω, then it is imperative that the am-
plifiers have clipping limiters. Alternately, you can also insert a clipping limiter before the amplifi-
er.
•
To achieve sensible acoustic results and to protect the speaker from mechanical destruction dur-
ing 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@8Ω 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 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. There-
fore, 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).
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