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Mackie Industrial's 4000 Series consists of three model units, the 60 watt RMS AM4060, 120 watt RMS A4120 and the 160 watt RMS AM4160. The four microphone inputs on each of the three models are actively balanced, have XLR connectors, and can be programmed to interrupt or attenuate the line level inputs.
Microphone inputs 2 through 4 feature switched 24V phantom power and switched high-pass and low-pass filters. Microphone input 1 can be switched to line level, set to have priority over all inputs, and can be activated by either VOX with an adjustable threshold or a contact closure. Activation of any microphone override provides 18Vdc (300mA) at a barrier connector on the rear panel, which may be used to drive LEDs or relays. Two unbalanced, stereo Aux inputs are internally summed to mono and selected by a switch on the front panel. Two unbalanced Tape (auxiliary) line level outputs with a level control and an unbalanced signal processing loop are also provided. All are terminated to RCA connectors.
Output modes include 4 & Mac189; and 25V, 50V, 70V and 100V constant voltage. The smart output stage is fully protected against permanent damage caused by overloading, shorts and extreme temperatures. The AM4060, AM4120 and AM4160 will operate on either 115 or 230VAC, 50/60Hz supplied by a detachable IEC power cord. Insulated terminals to connect a backup 24Vdc battery are provided on the rear panel. Switchover to DC is automatic.
The front panel provides level controls for each Mic, selected Aux and Master volume, as well as the Bass and Treble shelving filters. The control knobs can be easily removed for security, and their recessed shafts covered with inserts supplied with the unit. LEDs indicate power, signal present at the output, peak and output overload. 12dB/octave Bass and Treble shelving equalization with up to 12dB of boost or cut at 100Hz and 10kHz can be applied to the output signal.
Mackie Industrial also unveiled the UP4161 amplifier, offering two discrete inputs with priority. The main program input is actively balanced and terminated to a barrier strip connection on the rear panel. The second input is unbalanced, and terminated to a single RCA connector. A contact closure will give priority to the balanced input by completely excluding the unbalanced input. Activation of the balanced input priority turns on 18Vdc (300mA) power at a barrier connector on the rear panel, which may be used to drive LEDs or relays. The unbalanced input features a paralleled output and 0/-20dB sensitivity switch. 12dB/octave Bass and Treble shelving equalization with up to 12dB of boost or cut at 100Hz and 10kHz can be applied to the output signal.
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