Mackie Onyx 1620i Owner's Manual - Page 13

The line-level inputs of channels 1 and 2 can also accept instrument-level signals if the hi-z switches [18] are pressed in. This allows you to connect guitars directly to channels 1 and 2, without the need for a DI box. The input impedance is optimized for direct connection, and high-frequency fidelity is assured. 11. STEREO LINE INPUTS (Ch. 9-16) These 1/4" jacks can be driven by balanced or unbalanced sources. To connect balanced lines to these inputs, use a 1⁄4" Tip-Ring-Sleeve (TRS) plug, wired as follows: Tip = Positive (+ or hot) Ring = Negative (- or cold) Sleeve = Shield or ground To connect unbalanced lines to these ­inputs, use a 1⁄4" mono (TS) phone plug, wired as follows: Tip = Positive (+ or hot) Sleeve = Shield or ground If you just have a mono source, plug it into the left input (labeled left/mono), and the signal will appear (as if by magic) equally on the left and right of the main mix. 13. LEFT/RIGHT 1/4" MAIN OUTPUTS These 1/4" TRS output connectors provide the balanced or unbalanced line-level output of the main mix to an anxiously-waiting world. This is the same signal that appears at the XLR main outputs [4] on the rear panel, except it is not affected by the main output level switch [5]. Connect these outputs to the next device in the signal chain, such as an external processor (graphic equalizer or compressor/limiter), external power amplifiers running passive loudspeakers, or to the inputs of powered loudspeakers. They could also be connected to the inputs of a balanced 2-track recorder, when doing a "live to 2-track" type recording. 14. ALT 3-4 OUT These 1/4" TRS jacks provide a balanced line-level signal that can provide an alternate stereo mix for recording or subgrouping. Connect these outputs to the inputs of an amplifier, powered speaker, or recording device. Any channel whose mute switch [33] is engaged, is added to the alt 3-4 outputs. 12. CTRL-RM OUT These 1/4" TRS jacks provide balanced left and rightline-level outputs to run studio monitors in the control room. Connect these outputs to the inputs of an amplifier, powered speakers, or recording device. The alt 3-4 output doesn't have a master level control. All the channels assigned to the alt 3-4 bus are summed together (post-fader and pan) and sent directly to the alt 3-4 out. The source that plays in the control room, headphones, and meters can be selected using the switches [37, 38] in the control room/phones source matrix: • The main mix, if main mix is selected as the control room/phones source • Tape outputs, if tape is selected • Alt 3-4 outputs if alt 3-4 is selected • A 2-track FireWire feed from your computer if FW 1-2 is selected • A combination of all four above Except for main mix, whatever is playing in these outputs can also be routed to the main mix if assign to main mix [39] is engaged. (The main mix input to the control room is disconnected if assign to main mix is engaged.) The headphones and meters play the same program as the control room. The meters show the levels prior to the control room and phones level controls. Owner's Manual 13