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15GB8 User Guide
Points to Remember
In all cases, use good quality twin screened audio cable. Check for instability at the output.
Always connect both conductors at both ends, and ensure that the screen is only connected at one end.
Do not disconnect the mains earth from each piece of equipment. This is needed to provide both safety and screen returns to the
system star point.
Equipment which has balanced inputs and outputs may need to be electrically isolated from the equipment rack and/or other
equipment, to avoid earth loops.
It is important to remember that all equipment which is connected to the mains is a potential source of hum and interference and
may radiate both electrostatic or electromagnetic radiation. In addition, the mains will also act as a carrier for many forms of RF
interference generated by electric motors, air-conditioning units, thyristor light dimmers etc. Unless the earth system is clean, all
attempts to improve hum noise levels will be futile. In extreme cases there will be no alternative but to provide a completely
separate and independent `technical earth' to replace the incoming 'noisy earth'. However, always consult your local electricity
supply authority to ensure that safety regulations are not being infringed.
WORKING SAFELY WITH SOUND
Although your new console will not make any noise until you feed it signals, it has the capability to produce sounds which when
monitored through an amplifier or headphones can damage hearing over time.
The table below is taken from the Occupational Safety & Health Administration directive on Occupational noise exposure (1926.52):
PERMISSIBLE NOISE EXPOSURE
DURATION PER DAY, HOURS SOUND LEVEL dBA SLOW RESPONSE
890
692
495
397
2 100
1.5 102
1 105
0.5 110
<0.25 115
Conforming to this directive will minimise the risk of hearing damage caused by long listening periods. A simple rule to follow is the
longer you listen the lower the average volume should be.
Please take care when working with your audio - if you are manipulating controls which you don’t understand (which we all do when
we are learning), make sure your monitors are turned down. Remember that your ears are the most important tool of your trade,
look after them, and they will look after you.
Most importantly - don’t be afraid to experiment to find out how each parameter affects the sound - this will extend your creativity
and help you to get the best results.
Recommended Headphone Impedance 200-600 ohms.
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