Axel Oxygen 5 Manuel d'utilisateur télécharger pdf (Page 20)

FIRST INSTALLATION RECOMMENDATIONS

ENG

Axel Technology srl www.axeltechnology.com FIRST INSTALLATION

RECOMMENDATIONS

8.6 EARTHING

The connection to earth (ground) in an audio system is crucial for two reasons:

1. SAFETY

2. AUDIO PERFORMANCE

For safety it is important that all equipment earths are connected to mains earth so that exposed metal parts are

prevented from carrying high voltage which can injure the operator.

The same earth is also used to shield audio cables from external interference such as the hum fields associated with

power transformers, lighting dimmer buzz, and computer radiation. Problems arise when the signal sees more than one

path to mains earth. An earth loop results causing current to flow between the different earth paths. This condition is

usually detected as a mains frequency audible hum or buzz. To ensure safe and trouble-free operation we recommend

the following:

Use a clean mains outlet for the audio system: Be sure to use a 'clean' power outlet, i.e. one that is

fed directly from the mains, including earth. "Polluted" mains are caused by changing currents on the outlets, such as air-

conditioners, coffee machines, fridges, computers, dimmer packs etc. DO NOT connect any of these types of items to

the Oxygen 5 main power outlet.

Use star point earthing: It is best to install a ‘star point’ system where the individual earths to the equipment

racks and equipment areas are separately run from a solid central reference earth point.

It is advisable to install several multiple mains connectors close to the Oxygen 5, with a master power switch to shut

down all power to the studio..

Have your mains system checked by a qualified electrician.

Do not remove the earth connection from the console mains plug: The console chassis is

connected to mains earth through the power cable to ensure your safety. Audio ground is connected to the console

chassis internally.

If problems are encountered with earth loops disconnect the audio cable screens at one end, usually at the destination.

Equipment such as CD players do not have a mains ground connection. In this case the shielding can be connected on

both sides of the connection - a ground loop will not occur. Try to choose a CD player with metal housing.

Avoid induced interference: To prevent interference pickup keep audio cables away from mains power units,

cables and distribution boards, motors, lighting and computer cables and equipment, and any other heavy duty electrical

equipment. Where this cannot be avoided cross the audio and ‘dirty’ equipment cables at right angles to minimise

interference.

Use low impedance sources such as microphones and line level equipment rated at 200 ohms or less to

reduce susceptibility to interference. The console outputs are designed to operate at low impedance to minimise

interference problems.

Use balanced connections where possible as these provide further immunity by cancelling out

interference that may be picked up on long cable runs. To connect an unbalanced source to a console input (balanced),

link the cold input (XLR pin 3 or jack ring) to 0V earth (XLR pin 1 or jack ground) at the console. To connect the console

output (balanced) to an unbalanced destination, link the cold output to 0V earth at the console.

Use good quality cables and connectors and check for correct wiring and reliable solder joints. Allow

sufficient cable loop to prevent damage through stretching.

If you are not sure ... Contact your Axel Technology agent for advice.

8.7 POSITION

The console should be located in a convenient space commensurate with the use to which the console is being put.

Ideally a cool area is preferred not in close proximity to power distribution equipment or other potential sources of

interference. Provision should be made for some flat surface surrounding the console to prevent people using it as a

table top.

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Axel Oxygen 5 Manuel d'utilisateur Page 20

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