Kling-freitag K&F CD 44 Digital System controller User Manual download pdf (Page 72)

User's manual K&F CD 44 Digital System Controller

• The maximum cable length between two devices is 150 m.

• Use shielded ‘Twisted Pair’ cables with an impedance of 110 Ohm (80 - 150 Ohm are

tolerable). They are available at specialty stores and are called ‘AES/EBU Cables’.

• Do not mix any cables with different impedance within one transmission line.

• Do not use any ‘classical’ XLR audio cables!

• The cable may not be bent too much or pulled over sharp edges. Please observe the

permissible minimal bending radius which is provided by your cable’s manufacturer.

• Ensure the soundness of the connectors.

• If the AES/EBU signal is to be distributed over several lines of CD 44, then a special line

splitter is necessary.

If no special 110 Ohm AES/EBU cable is available, then data cables for lighting technology

(DMX data cable with an impedance of 120 Ohm) can be used.

12.2 Transmissions over long Distances

If transmission distances exceeding 150 m need to be covered, it is necessary to use a

repeater.

The interface AES / EBU is the European Broadcasting Union’s implementation of the

Standards AES3 defined by the Audio-Engineering Society.

Further information is available at these organisations:

www.aes.org und www.ebu.ch

13. Wiring

Make sure that all units are switched off and all controls are turned down before connecting

your system.

• Only use high-quality speaker cables, (i.e. from KLING & FREITAG).

• Adapters for connections between the Speakon connecting panel of the CD 44 and

EP-5 / XLR-connectors, as well as for special uses must be professionally constructed.

• For analogue connections from the mixing console to the CD 44 and from the CD 44 to

the power amplifier inputs, please use shielded microphone cable with two conductors.

For digital signal transmission you will need shielded twisted pair cables.

• Please pay attention to the respective pin diagrams in this manual!

• Avoid ground loops.

• 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.

• Ensure that the connected speaker channels are working in phase (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.

• The cables should have a sufficient wire gauge. A minimum wire gauge can be easily

calculated with the following formula:

Wire Gauge [mm

] = Required Cable Length [m] / 2 x Impedance [Ω]

• Please make sure that the total impedance of the loudspeakers is not lower than the

minimal load impedance indicated on the power amplifier.

14. Operating the Speakers

• Operating the Controller

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Kling-freitag K&F CD 44 Digital System controller User Manual Page 72

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