Mackie Big Knob Owner's Manual - Page 12

BIG KNOB PHONES AMP and STUDIO OUT The PHONES AMP and STUDIO OUTS have the option of being fed signal by the currently selected INPUT SOURCE SELECT buttons (thus mirroring the mix being heard by the engineer) or the signal connected to the DAW PHONES MIX INPUT connectors (thus providing a separate unique monitoring mix for the talent). This allows the engineer to listen to his or her own master mix in the control room, while allowing the talent to listen to a customized headphone mix at the same time through the PHONES 1 or 2 outputs on the front panel or through an external headphone amp connected to the PHONES AMP OUTPUT on the rear panel, as well as the studio monitor outs (STUDIO OUTS). The choice of which stereo signal (current source or headphone mix input) is heard is determined by the PHONES/STUDIO OUTS SOURCE select button on the front panel. PHONES AMP OUTPUTS Connect these stereo 1/4-inch balanced/unbalanced connectors to an external multi-headphone amplifier. This allows you to connect multiple sets of headphones for the talent. The PHONES AMP OUTPUT level is not affected by the Big VOLUME Knob or the headphone level controls on the front panel. The headphone amplifier should have its own individual volume controls for the headphones. PHONES AMP Level Switch This two-position switch sets the level of the PHONES AMP outputs to either +4 dB (out) or -10 dB (pushed in). Use the +4 dB setting when connecting to balanced inputs on professional equipment operating at the +4 dBu standard, and use the -10 dB setting when connecting to unbalanced inputs on consumer equipment operating at the -10 dBV standard. STUDIO OUTS Connect these stereo 1/4-inch balanced/unbalanced connectors to a pair of active monitors (or to an amplifier and passive monitors) in the studio performance space. This allows the performers to hear playback without having to use headphones, and allows the control room engineer to communicate to the performers through the talkback system. The STUDIO OUTS level is controlled by the STUDIO OUTS LEVEL control on the front panel. STUDIO OUTS Trim Control This trim control adjusts the sensitivity of the STUDIO OUTS signal. Use the +4 dB setting when connecting to balanced inputs on professional equipment operating at the +4 dBu standard, and use the -10 dB setting when connecting to unbalanced inputs on consumer equipment operating at the -10 dBV standard. Although the trim control is typically set to one side or the other, it can be adjusted to any setting between the +4 and -10 positions if necessary. AC Socket Connect the included detachable power cord to this AC socket (2-prong IEC connector) on the rear panel. Make sure the AC SELECT switch is set to the correct AC voltage (see AC SELECT Switch). POWER Switch Push this switch up to turn the Big Knob on. Press the bottom of this switch to put the Big Knob into standby mode. It will not function, but the circuits are still live. To remove AC power, either turn off the AC mains supply, or unplug the power cord from the speaker and the AC mains supply. AC SELECT Switch Set this switch to the 100-120V position for 100 VAC and 120 VAC power, and to the 220-240V position for 220 VAC and 240 VAC power. POWER ON A B C MONITOR MONITOR MONITOR OUTPUTS 2-TRACK 2-TRACK A B -10dB +4dB L -10dB +4dB L -10dB +4dB L L +4dB -10dB +4dB -10dB L AC SELECT 100-120V 220-240V R R R R R DAW OUTPUT +4dB -10dB L R PHONES AMP +4dB -10dB L R STUDIO DAW PHONES MIX INPUT -10dB +4dB L L +4dB -10dB 2-TRACK A U -10dB +10dB R R DAW MIX U +4dB -10dB (MONO) L BAL/ UNBAL +4dB -10dB (MONO) L SOURCES 2-TRACK B R U -10dB +10dB PHONO R U BAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL -10dB +10dB BAL/ UNBAL -10dB +10dB +4dB -10dB (MONO) L R BAL/ UNBAL GROUND L R TALK BACK FOOT SWITCH RIAA 12 BIG KNOB