Mackie M 1400 Specification

1/16/97

F A S T REC O VER Y SERIES HIGH CURRENT POWER AMPLIFIERS

MORE INFORMATION

1. GENERAL. The amplifier shall have a free-standing frame with front and rear brackets for rack-mounting, and supplied with four resilient feet suitable for tabletop placement. The amplifier shall be capable of twochannel operation, with a switch to place the amplifier into single-channel operation by bridging the outputs of the two channels.

2. POWER O UTPUT.

M•1200: The power amplifier, being of two channels, shall deliver 225 watts RMS into 8 ohms per channel, 400 watts into 4 ohms, and 600 watts into 2 ohms with both channels operating. In bridge-mode of operation it shall deliver 800 watts RMS into 8 ohms and 1200 watts into 4 ohms.

M•1400: The power amplifier, being of two channels, shall deliver 250 watts RMS into 8 ohms per channel, 425 watts into 4 ohms, and 630 watts into 2 ohms with both channels operating. In bridge-mode of operation it shall deliver 850 watts RMS

into 8 ohms and 1260 watts into 4 ohms.

3. POWER SUPPLIES. All necessary operating voltages for the amplifier shall be provided by an internal power supply. A master power switch shall be located on the front panel along with a green power-indicating light.

4. INPUT CHANNE L CONNECTIONS. Each

monaural input channel shall have an electronically balanced line-level input, accommodating a nominal line level between –10dBV and +4dBu, and appearing on the rear panel as a female XLR-3 type connector. In addition, each monaural input channel shall have a parallel 1/4" TRS phone jack and a male XLR-3 type connector, which can be used as inputs or “thru” jacks for daisy-chaining the input signal to another amplifier. Pin 2 of the XLR connectors, and the tip of the 1/4" TRS phone jack, shall be non-inverting.

THESE SPECIFICATIONS

ARE AVAILABLE ON 3.5"

WINDOWS & MAC DISKS

IN POPULAR WORD

PROCESSOR FORMATS

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CALL 800/258-6883

FAX 425/487-4337

OUTSIDE THE U.S., CALL

425/487-43 33

FAX 425/485-1152

5. INPUT CHANNE L LEVEL CONTROLS. Each monaural

input channel shall be equipped with a gain control appearing on the front panel, each having 40 detent positions, and calibrated in dB and volts.

6. FRONT PANEL INDICATORS. Each channel shall

have an associated six-segment LED meter appearing on the front panel, capable of displaying signal present, –20dB, –9dB, –6dB, –3dB, and overload. Each channel shall have internal status LEDs appearing on the front panel to indicate activation of protect mode and shortcircuit protection. Two tem-

perature status LEDs shall appear on the front panel, one to indicate normal operation (COLD) and one to indicate thermal protection (HO T).

7. PROTECTION FEATURES.

The amplifiers shall provide delayed activation of the outputs at turn-on. Each channel shall have a shortcircuit protection circuit for detecting excessive current flow at the output that, when activated, mutes the output for four seconds. The shortcircuit protection shall continuously cycle on and off until the shorted condition is remedied. The amplifier shall have a thermal protection circuit to protect the power devices from overtemperature operation. The circuit shall activate when the internal temperature crosses the safe-operating threshold and, when activated, mute the outputs until the internal temperature cools to a safe-operating temperature, at which time the amplifier shall resume normal operation. The amplifier shall have a fan to cool the heat-producing internal components. The fan shall operate at two speeds, the speed being determined by the internal temperature and the signal level present at the output. The amplifier shall have an SCR crowbar circuit to protect the speakers against a catastrophic amplifier failure. The circuit shall activate in the presence of continuous DC at the speaker outputs, and shall shut the amplifier down by turning off the high-voltage rails.

8. OUTPUT CONNECTIONS.

M•1200: Each channel shall have heavy-duty 5-way binding post speaker output connectors appearing on the rear panel, with 3/4" spacing for accommodating standard double banana plugs as well as spade lugs or bare wires. Each channel shall have a 1/4" TS phone speaker output jack appearing on the rear panel in parallel with the binding post output.

M•1400: Each channel shall have heavy-duty 5-way binding post speaker output connectors appearing on the rear panel, with 3/4" spacing for accommodating standard double banana plugs (120V versions only) as well as spade lugs or bare wires. Each channel shall have a Neutrik brand Speakon® speaker output jack appearing on the rear panel in parallel with the binding post output.

9. AMP MODES. The amplifier shall have a three-way switch appearing on the rear panel for selecting the mode of operation, which shall include stereo (two channels in, two channels out), mono (one channel in, two channels out), and bridge (one channel in, one channel out bridged between both speaker outputs).

10. OUTPUT APPLICA TION.

The amplifier shall have a three-way switch appearing on the rear panel for selecting between limiter on, limiter off, and subwoofer mode. The defeatable electronic limiter circuit shall sense the onset of clipping and shall limit the input signal and thereby prevent the output from clipping. The amplifiers shall have a twoway switch appearing on the rear panel for selecting between a 63Hz and 125Hz low-pass cutoff frequency when subwoofer mode is selected.

11. LOW-CUT FILTER. Each channel shall have a low-cut filter with a variable frequency control appearing on the rear panel covering a range of 10Hz (OFF) to 170Hz.

12. CONSTANT DIRECTIVITY HORN E Q . Each channel

shall have a two-way switch appearing on the rear panel for selecting a constant directivity horn equalization circuit. When selected, this circuit shall provide a 6dB per octave high frequency boost. The EQ shall have a variable frequency control appearing on the rear panel covering a range of 2kHz to 6kHz. The 6kHz position shall be called AIR.

13. PHYSICAL CONFIGURATION. The amplifier shall

be rack-mountable with rear support rails for extra support, and shall have a steel chassis frame painted grey-black. The amplifier shall be 19" wide, 3.5" tall (2U) and 15.25" deep, and shall weigh 36 pounds.

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