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LE100/LE200
CABLE LENGTHS
When connecting any loudspeaker system to an amplifier, it is recommended that the return
resistance of the cable used is less than one tenth of the nominal impedance of the loudspeaker
or loudspeakers in parallel. The table below gives an indication of the maximum permissible
cable runs for various conductor cross-sectional areas.
RECOMMENDED AMPLIFIERS
Martin Audio MA Series two and four channel power amplifiers are recommended for use with
LE Series stage monitors. These amplifiers work well at 4 ohms, making it possible to power two
cabinets in parallel from each amplifier channel. Models are available with power ratings from
700 W/ch. to 4000 W /ch. (into 4 ohms). We recommend amplifier models MA5.2K or iK81
if more than two LE Series monitors need to be connected in parallel, as these amplifiers can
comfortably drive 2 ohm loads.
Other manufacturers' power amplifiers may be used provided they are capable of delivering
the necessary power into the combined impedance of the monitors in use. Note that many
amplifiers suffer sonic degradation when driving low load impedances or, worse still, shut down.
Always check your intended power amplifier's specifications and conduct listening tests before
committing to a very low impedance system design.
The table below specifies the recommended minimum amplifier rating for the LE100 and LE200
when used in pairs. The "Recommended models" column lists the Martin Audio MA Series
amplifier models suitable for each speaker model.
Model
LE100
LE200
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.
LE100/LE200 User Guide V1.0
USER GUIDE
Conductor CSA
1.0 mm
2
1.5 mm
2
2.0 mm
2
2.5 mm
2
4.0 mm
2
6.0 mm
2
Rating,
Rating,
AES
Peak
300 W
1200 W
400 W
1600 W
Maximum Cable Run
4 ohms
8 ohms
11 m
22 m
17 m
34 m
22 m
44 m
29 m
58 m
44 m
88 m
66 m
132 m
Impedance Minimum amplifier Recommended models
8 ohms
2400 W into 4 ohms MA2.0, MA3.0, MA5.0Q
8 ohms
3200 W into 4 ohms MA3.0, MA5.0Q
9
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