LAm115 User’s Guide
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5
The following table indicates, for 3 common sizes, a cable length with a maximum serial
resistance equal to 4% of the load impedance (damping factor = 25).
Cable Section Maximum Length
Impedance = 8 Ohms Impedance = 4 Ohms
1,5 mm² [AWG # 14] 12 m [40 ft] 6 m [20 ft]
2,5 mm² [AWG #12] 20 m [64 ft] 10 m [32 ft]
4 mm² [AWG #10] 32 m [104 ft] 16 m [52 ft]
7. Amplification
LAm115 monitors are designed to be used with professional power amplifiers capable of
producing the following power outputs into 8 ohms:
Full-Range: 800W/8 ohms to 1000W/8 ohms
Bi-Amp:
Low Frequency: 1200W/8 ohms to 2000W/8 ohms
High Frequency: 200W/8 ohms to 300W/8 ohms
Care should be taken to avoid amplifier clipping. It is important to understand that a
low power amplifier driven into clipping is more likely to damage a loudspeaker than a
higher power amplifier used within its ratings. This is because music signals have a high
peak-to-average "crest" factor. When an amplifier is severely overdriven, its output
waveform is clipped (its peaks are squared off) – reducing the crest factor. In extreme cases,
the waveform can approach that of a square wave. An amplifier is normally capable of
producing far more power under these conditions than its undistorted rated power output.
The use of very high power amplifiers with outputs greater than those recommended is
discouraged.
Care should be taken to avoid switch-on surges, which can result in momentary power peaks
in excess of specified ratings. When powering up a sound system it is important to switch on
the amplifiers after the mixer and control electronics have stabilised. When powering down
the system, reverse the sequence and switch off the amplifiers first.