Martin Audio MA4.2, User Manual

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5.8 Impedance matching (MLS switch)
The MLS™ switches (2) are located on the rear panel. The MLS (Minimum
load select) switches offer impedance matching, so you can drive the
MA4.2 into 2 ohms without increased heat loss.
As stated earlier the MA4.2 can produce at least 2000 watts into any
impedance between 2 and 8 ohms. Utilise higher MLS™ positions when
connecting to lower impedances as shown in Table 2. As can be seen from
Table 2, The MA4.2 can produce in excess of 2000 watts.
*Component tolerance dependent.
Table 2.
Power rating at 1kHz and 1% THD.
MLS™ positions can be different for each channel and a variety of
combinations can be achieved see Table 3.
The way to find the best MLS™ position for your application is by
experimentation using table 3 for initial starting positions. The amplifier is
very well protected (even down to 0.3 ohms), but where speed is of
essence stick to the fixed positions. The MA4.2 amplifier is a power
converter and when you select MLS™ positions you are allocating a portion
of power from 5000 watts.
Table 3.
Martin Audio – MA4.2 Power Amplifier
E
NGLISH
12
MA4.2 MLS Switch MLS Switch Position
Speaker Impedance -5dB -4dB -2dB 0dB
16 ohms Stereo 2x 220W 260W 410W 650W
8 ohms Stereo 2x 430W 520W 820W 1300W
4 ohms Stereo 2x 830W 1000W 1600W 2100W
2 ohms Stereo 2x 1660W 2000W 2200W 2400W*
8 ohms Bridged mono 1x 1660W 2000W 3200W 2800W
4 ohms Bridged mono 1x 3400W 4000W 4400W 4800W*
Channel Impedance MLS Power Comments
A 8 -2dB 820W Power
B 8 -2dB 820W reduction
A 4 0dB 2100W High peak
B 4 0dB 2100W power
A 8 0dB 1300W Power
B 2 -5dB 1660W matching
A 8 -2dB 820W Power
B 4 0dB 2100W sharing
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