Specifications

Figure 10. MLS switches on rear panel

6 OPERATION MODES

6.1 Stereo operation

For stereo (dual channel) operation, leave the Link and Phase reverse

switches in the un-depressed position. In this mode, both channels operate

independently of each other, with their level attenuators controlling their

respective levels. Never connect either output terminal to ground or in

parallel. The recommended minimum nominal impedance for stereo or

tandem operation, is 2 ohms per channel.

6.2 Tandem mono

For tandem (dual channel-single input) operation, depress the Link switch.

Both channels can now be driven by a signal at either input connector. The

output connection is the same as in stereo mode. You can use either TRS

connectors for linking out etc. Do not use the remaining XLR and TRS

connectors for mixing or other purposes. Both level attenuators are

active, allowing you to set different levels for each channel.

Never connect either output terminal to ground or in parallel.

6.3 Bridged mono

To bridge the amplifier, depress the Link switch (7) and Phase reverse switch

(6). Both channels are then driven by a single signal at either input. You can

use any remaining input connectors for linking etc. Do not use the remaining

XLR and TRS as input jacks simultaneously for mixing or other purposes.

To obtain an output, connect the speaker leads to pin +1 on channel A

Speakon to speaker positive terminal and pin +1 on channel B

Speakon to speaker negative terminal. Do not connect either of the -1

(negative) pins of the Speakons. Do not connect speakers to channel

A or B in the normal manner in bridge mode, as this can cause

serious damage.

Martin Audio – MA4.2 Power Amplifier

ENGLISH

-5

-4

-2

1+ CH.B+

1– CH.B–

OUTPUT CH.B

MLS

Switch

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