Mackie Onyx 1220i Owner's Manual - Page 13

1 ONYX MIC PRE 9 2 ONYX MIC PRE 3 ONYX MIC PRE 4 ONYX MIC PRE CTRL - RM OUT BAL/UNBAL MAIN OUT BAL/UNBAL ALT 3-4 OUT BAL/UNBAL 12 L LINE IN 5-6 13 14 R L R L/3 R/4 LINE IN 7-8 LINE IN 9-10 LINE IN 11-12 15 TAPE 16 L IN OUT R 10 18 19 1 LINE BAL/UNBAL LINE HI-Z 20 48V 2 LINE BAL/UNBAL LINE HI-Z 3 LINE BAL/UNBAL 75Hz 18dB/OCT 4 LINE 11 BAL/UNBAL 75Hz 18dB/OCT 48V 48V 48V L (MONO) BAL/UNBAL R L (MONO) BAL/UNBAL R L (MONO) BAL/UNBAL R L (MONO) BAL/UNBAL 17 R PREMIUM ANALOG MIXER w/ PERKINS EQ & FIREWIRE Insert jacks continued... ring tip sleeve (TRS plug) This plug connects to one of the mixer's Channel Insert jacks. SEND to processor "tip" "ring" RETURN from processor Professional ribbon, dynamic, and condenser mics all sound excellent through these inputs. The mic inputs will handle any kind of mic level you can toss at them, without overloading. Microphone-level signals are passed through the mixer's splendid microphone preamplifiers to become line-level signals. Insert jacks can be used as channel direct outputs; post-gain, and pre-EQ. See the connector section on page 29 (figure G) showing three ways to use inserts. Connection Section This is where you plug in things such as: microphones, line-level instruments, guitars, effects, a recorder, PA system, powered monitors, powered subwoofer, etc. Check out the hookup diagrams for some connection ideas. See Appendix B (page 28) for further details and some rather lovely drawings of the connectors you can use with your mixer. 9. MIC INPUTS This is a female XLR connector, that accepts a balanced microphone input from almost any type of microphone. The microphone preamps feature our Onyx design, with higher fidelity and headroom rivaling any standalone mic preamp on the market today. The XLR inputs are wired as follows: Pin 1 = Shield or ground Pin 2 = Positive (+ or hot) Pin 3 = Negative (- or cold) We use phantom-powered, balanced microphone inputs just like the big studio mega-consoles, for exactly the same reason: This kind of circuit is excellent at rejecting hum and noise. You can plug in almost any kind of mic that has a standard XLR-type male mic connector. PHANTOM POWER Most modern professional condenser mics require 48V phantom power, which lets the mixer send lowcurrent DC voltage to the mic's electronics through the same wires that carry audio. (Semi-pro condenser mics often have batteries to accomplish the same thing.) "Phantom" owes its name to an ability to be "unseen" by dynamic mics (Shure SM57/SM58, for instance), which don't need external power and aren't affected by it anyway. Phantom power for each channel can be selected using that channel's phantom [20] switch. Never plug single-ended (unbalanced) microphones, or ribbon mics into the mic input jacks if phantom power is on. Do not plug instrument outputs into the mic XLR input jacks with phantom power on, unless you are certain it is safe. 10. MONO LINE INPUTS (Ch. 1-4) These 1/4" jacks share circuitry (but not phantom power) with the mic preamps, and 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 Owner's Manual 13