Martin Audio MA2.8 Power Amplifier handleiding

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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

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