Leem HMM-16FX, Owner'S Manual, Page: 13 / 24

11
HMM-16FX
- 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 provided 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 equip-
ment rack and/or other equipment, to avoid earth loops.
It is important to remember that all equipment which is connected to the mains it 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 independ-
ent ‘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.
Points to Remember
LEEM products are wired to reflect accepted wiring practices used throughout the world.
Balanced XLR connectors are wired as described:
Pin #1 Shield
Pin #2 Positive
Pin #3 Negative
Balanced 1/4” TRS connectors are wired as described:
Tip is Positive
Ring is Negative
Sleeve is Shield
Connections
Insert Points
Amp/Line Input
Headphones
Unbalanced
Input/Output
AUX Send
Ring
Ring
Tip
Tip
Sleeve
Sleeve
Send
Return
Screen
Hot ( positive )
Cold ( negative)
Screen
Left Signal
Right Signal
Ground
Signal
Ground
3 Pole (Stereo) Jack
2 Pole (Mono) Jack
Ring Tip Sleeve
Tip Seeve
2
1
3
Balanced Input
Hot (positive)
Hot (positive)
Sleeve
Screen
Cold (negative)
Cold (negative)
Points to Remember
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