5.7
Connecting speakers
Speaker connections are made via the two Neutrik NL4FC Speakon
connectors (1). These connectors meet the EC safety requirements. They
are wired as follows:
Pin -1
Speaker ground.
Pin +1
Speaker positive.
Pin -2
No connection.
Pin +2
No connection.
Figure 9. Speakon connector
Please note that this is the standard wiring convention for Speakon
connectors adopted worldwide.
Never connect either output terminal to ground or to some other
output or input terminal (see warning on page 2). For normal two-
channel operation, connect each speaker load across the outputs positive
and ground terminals. Pay attention to speaker polarity; loudspeakers
connected out of polarity can degrade sound quality.
Keep the speaker cables as short as possible and use a good quality
stranded speaker cable. Do not use shielded wire, such as microphone or
guitar cable. Remember that the speaker cable robs the power of the
amplifiers in two ways: It increases the load impedance and introduces
resistive power losses.
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
MA2.8 into 2 ohms without increased heat loss.
As stated earlier the MA2.8 can produce at least 1100 watts into any
impedance between 1.5 and 8 ohms. Utilise higher MLS™ positions when
connecting to lower impedances as shown in Table 2.
Martin Audio – MA2.8 Power Amplifier
E
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