KLING & FREITAG K&F SONA SUB - Manual (Page 17)

User's manual K&F SONA SUB
KLING & FREITAG GMBH © 2014 Version 2.1 Page 17 of 21
7.1 Wiring instructions
• Before connecting your SONA SUB loudspeaker switch off all equipment and turn
down all level controls.
• Only use high-quality speaker cables with a sufficient wire gauge. The wire gauge
depends on the length of the speaker cable.
Minimum Wire Gauge (mm²)
= Required Cable Length (m) / (2 x Speaker Impedance (Ohm))
• For connections to the power amplifier inputs, please use 2-pin shielded microphone
cable (balanced) with high-quality connectors.
• Avoid ground loops.
• Please pay attention to the pin assignments shown in this manual.
• Make sure that the +/- polarity of the speakers at the amplifier is correct. When
simultaneously using power amplifiers from different manufacturers, be sure to use the
correct specific pin configuration. It may be necessary to modify the pin configuration
on the power amplifiers or on the connectors leading to them.
• Upon completing the wiring, ensure that the connected speaker channels are working
in phase. To do so, use i.e. a phase checker. A phase error can also be recognized when
the connected channels are used simultaneously. During simultaneous use the bass
frequencies become notably quieter or the mid-frequencies such as voices cannot be
located.
• If several loudspeakers are connected, the signal can be linked through parallel
from one loudspeaker to the next. Please make sure that the total impedance of the
loudspeakers R(Ohm) is not lower than the minimal impedance indicated on the power
amplifier.
1/R1 + 1/R2 + 1/R3 + ... = 1/Rtotal
8. Operating the Speakers
• Switch off all equipment and turn down all level controls of the mixing console and the
power amplifiers.
• Wire your SONA SUB systems according to the instructions in this manual.
• Switch on the mixing console first, then the controller and the power amplifier. Always
use the before mentioned switching order. Otherwise switching noises may damage the
sound system.
• If there is interference, turn off all appliances in the reverse order and check all cable
connections.
• Successively turn up the individual power amplifier channels and send a signal with low
volume to the system. Check to see if the desired signals are applied to the intended
speakers and make sure there is no interference.
• Turning down the input level controls may not always prevent distortions in the input
section of the power amplifier, especially if this section has a relatively low headroom.
A clipping signal may not be displayed by the clipping indicator then! To prevent signal
interruptions or damages to the speakers, turn the level controls of the power amplifier
to the maximum position, if possible. Set the output level of the mixing console or the
controller to a level that doesn't overload the power amplifiers or decrease the limiter
threshold of the controller.
• When turning off the system, the input controls for the power amplifiers should be
turned down first followed by the power switches of the amplifiers. After that, the
other appliances can be turned off.