Mackie UP4161 Operation, Using the BALANCED IN, Using the UNBALANCED IN, Commands Standby, Overl

4. Operation

Using the BALANCED IN

The BALANCED IN accepts a line-level signal. Connect the input source to the BALANCED IN barrier strip screw terminals.

PRIORITY Function

The BALANCED IN has priority over the UNBALANCED IN. The priority function can be activated by connecting a normally-open switch between the input PRIORITY terminal and the GND terminal on the INPUT barrier strip on the rear panel. Closing the switch activates the priority function and mutes the UNBALANCED IN.

Using the UNBALANCED IN

The UNBALANCED IN accepts either a line-level signal (0 dB position) or a low-level signal (20 dB position), using the input SENSITIVITY switch.

High-Pass Filter

Push in the H.P. switch to engage the high-pass filter, which rolls off frequencies below 300Hz at 12 dB/octave.

Low-Pass Filter

Push in the L.P. switch to engage the low-pass filter, which rolls off frequencies above 7kHz at

12dB/octave.

Note: The H.P. and L.P. filters affect both the

balanced and unbalanced inputs.

COMMANDS STANDBY

An external normally-open switch can be connected between the STANDBY terminal and the GND terminal on the COMMANDS barrier strip on the rear panel. Closing the switch enables the signal to pass through the amplifier, and opening the switch puts the amplifier in standby mode (power on, no signal).

Note: The UP4000 Series is shipped with the Standby Mode disabled. Move jumper J1 on the input board to enable the Standby Mode (see instructions on page 8).

OVERL.

Connect an LED or relay between this terminal and the GND terminal to provide an external indication if the overload circuit has been activated. It provides +18 VDC with a maximum output capacity of 300mA when activated. See "Application Diagram" on page 6.

POWER OUTPUTs

The amplifier outputs on the UP4000 Series can be used with a 4-ohm impedance load, or to directly drive a 25V, 50V, 70V, or 100V distributed system (constant-voltage system).

Direct Speaker Connection

If the UP4000 Series is not being used in a distributed speaker system, you can connect a speaker with a 4-ohm load between the "4Ω" terminal and the "0" terminal.

Using the PARALLEL OUT

The PARALLEL OUT connector is provided to connect the UNBALANCED IN signal to multiple amplifiers in a daisy-chain configuration.

To Next

Amplifier

Distributed Speaker System

When using the UP4000 Series in a distributed system, connect the distributed system between the appropriate POWER OUTPUT terminal (25V, 50V, 70V, or 100V) and the "0" terminal. Make sure the speakers in the system are tapped appropriately so they do not exceed the rated power of the amplifier. (AM4060 = 60 watts, AM4120 = 120 watts, AM4160 = 160 watts).

From Signal

Source

UP4000 Series Daisy-Chaining Inputs

POWER INPUT 24V D.C.

The UP4000 Series can be powered using a 24 VDC power supply. This can serve as the primary power supply for the UP4000 Series, or as a backup supply in case of an AC power failure. The UP4000 Series seamlessly switches to the backup supply if there is a power loss. When both AC power and 24 VDC power are connected, the AC power is used and no current is drawn from the DC supply.

Note: The unit is not equipped with battery charging capability.

UP4000 – 9