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accommodating a total of 2 stereo auxiliary send buses and 2 monaural auxiliary send buses.

7.MAIN OUTPUT CONNEC- TIONS. The mixer shall have electronically balanced, line- level left and right main out- puts, appearing as 1⁄4" TRS jacks (tip hot, ring cold) on the rear panel. Additionally, the main buses shall offer left and right unbalanced insert connections, appear- ing on the rear panel as 1⁄4" phone TRS jacks.

8.OTHER OUTPUT AND MONITORING CONNEC- TIONS. The mixer shall have the following balanced line- level connections, appearing as 1⁄4" TRS jacks on the rear panel: left and right alter- nate (3–4) outputs, left and right control room outputs. For convenience, the left and right main outputs and the left and right tape moni- tor inputs shall also appear as RCA phono jacks on the rear panel. There shall also be a stereo headphone out- put on the front panel of the mixer, carrying the control room monitor signals at lev- els and impedances proper for headphones. The head- phone output connection shall be a stereo 1⁄4" TRS jack (tip left, ring right).

9.OUTPUT AND MONI- TORING CONTROLS AND SWITCHES. The mixer shall include 2 linear fader con- trols for gain adjustment of the main L/R outputs, cov- ering a range from infinite attenuation to +10 dB above unity gain. A tape monitor switch shall alter- nately select either the main L/R outputs or the signal at the tape inputs as the source for the control

room and headphones monitoring circuits. There shall be a stereo linear fader control for level adjustment of the control room monitor output, and a stereo rotary control for level adjustment of the headphone monitor output. The mixer shall have a stereo control for adjustment of the monitoring level of the internal solo signals, and a blinking LED to indicate channel solo condition. Additionally, any soloed channel(s) shall have their -20 and O/L LEDs light steadily, to indicate a solo condition.

10.OUTPUT METERING. The mixer frame shall in- clude 2 12-segment LED meters each displaying a signal range from –40 dBu to +10 dBu, each with an additional LED indicating mixer clipping level at +22 dBu. The meters shall moni- tor the main left and right output channels; alternately, the meters shall monitor the tape return signals when the tape monitor switch is depressed; or, the soloed input channel signals when any combination of solo switches is depressed.

11.AUXILIARY SEND CON- NECTIONS. The mixer shall include balanced line-level outputs from the auxiliary send buses. The left and right outputs of the 2 stereo auxiliary send buses and the outputs of the 2 monaural send buses shall appear on the rear panel as 1⁄4" TRS phone jacks (tip hot).

12.AUXILIARY RETURN CONNECTIONS. The mixer shall include 4 stereo auxil- iary return inputs. Each aux- iliary return shall have a left and a right unbalanced line- level input, accommodating a nominal line level of be- tween –10 dBV and +4 dBu,

and shall appear on the rear panel as 1⁄4" phone TRS phone jacks. The jacks shall be fitted with internal switches to accommodate monaural configuration, by using only the left jack(s).

13.AUXILIARY RETURN CONTROLS AND SWITCHES. The mixer shall include 4 dual-channel auxiliary return gain controls, each feeding the main stereo buses. Auxil- iary return #3 shall have its signal source switchable be- tween the auxiliary return #3 inputs or the signals avail- able on the alternate (3–4) mix outputs. Auxiliary return #4 shall be assignable to two different destinations, feeding either the main left and right buses or the monitor system only.

14.MICROPHONE PRE- AMPLIFIERS. The mixer shall include two micro- phone preamplifiers mounted on the rear of the mixer frame. Each micro- phone preamplifier shall feature electronically balanced transformerless inputs using female XLR-3-type connectors with gold-plated pins, a rotary sensitivity control adjust- able from –50 dBu to –10 dBu, and a line-level im- pedance-balanced output appearing at a 1⁄4" TRS phone jack. Globally switch- able phantom power shall be available at the microphone inputs.

15.MIXER EXPANDER FUNCTION. The mixer buses shall accommodate up to

48additional stereo input channels when connected to up to 3 Mackie Designs LM-3204E Expander units.

The mixer shall be fitted with a 20-pin IDC-type “expander input” connector mounted on the rear of the mixer frame, which shall carry all audio and control signals

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