DIGITAL SYSTEM AMPLIFIER
2.7 Selecting the Mode of Output (OUTPUT)
Different output modes are available for the amplifier‘s output channels. Each channel can be switched to high impedance mode (HZ) for driving 70 V or 100 V loudspeakers without output transformers (Direct Drive).
In DUAL or PARALLEL mode each output channel‘s OUTPUT setting can be independently set. In BRIDGED mode for each pair of outputs only the OUTPUT setting of the channel with odd number (1, 3, 5 or 7) matters, the OUTPUT setting of the channel with even number (2, 4, 6 or 8) is ignored.
Following section describes the four different OUTPUT settings of DSA amplifiers.
2 Ohm Mode / VLD Mode
In 2 Ohm mode the power amplifier reaches maximum output power having a load of 2 Ω connected. Up to 4 cabinetts having a nominal impedance of 8 Ω each can be driven by each amplifier channel. This mode should be used if a high number of speaker with medium or low power rating should be driven in low impedance mode (LZ). The VLD mode (Remote Control Module required) allows adjusting the output power of the amplifier channel. Please see page 11 for details about VLD mode.
Illustration 2.4: DUAL mode of CH 1 and CH 2 in 2 Ohm Mode
4 Ohm Mode
In 4 Ohm mode the power amplifier reaches maximum output power having a load of 4 Ω connected. Up to 2 cabinetts having a impedance of 8 Ω each can be driven by each amplifier channel. This mode should be used if speakers with high power rating (e.g. Subwoofers) should be driven in low impedance mode (LZ).
Illustration 2.5: DUAL mode of CH 1 and CH 2 in 4 Ohm Mode