Mackie ProFX12 Owner's Manual - Page 21

Owner's Manual R R BAL / UNBAL R LINE IN 12 ST RETURN FX SEND MAIN OUT PHONES U -20 +20 GAIN U 3615 10 5 0 5 EQ 10 STEREO GRAPHIC EQ 31 15 48V 10 PHANTOM 5 POWER 0 5 32 POWER 10 HI 15 15 MAIN 12kHz -15 +15 125 250 500 1K 2K 4K 8K METERS 0dB=0dBu U -15 +15 U 37 MID 2.5kHz MAIN MIX MON OL EQ IN BYPASS 38 15 10 6 3 -15 +15 LOW 80Hz FX PRESETS 01 BRIGHT ROOM 02 WARM LOUNGE 03 SMALL STAGE 48 USB 33 0 2 4 U 7 U AUX MON +15 U 04 WARM THEATER 05 WARM HALL 06 CONCERT HALL 07 PLATE REVERB 08 CATHEDRAL 09 CHORUS 10 CHORUS + REV 11 DOUBLER 49 PRESETS OO 39 +10 INPUT LEVEL 10 20 30 L R FX +15 12 TAPE SLAP 13 DELAY 1 (300ms) 14 DELAY 2 (380ms) 52 15 DELAY 3 (480ms) 16 REVERB + DLY (250ms) MUTE 40 34 50 USB THRU BREAK (MUTES ALL CHANNELS) PAN U U U 51 53 OL 41 35 OO LR OO +15 OO +15 MAX +20 OO FX MASTER FX TO MON PHONES TAPE LEVEL OO OO 42 MUTE 43 MUTE OL OL MON 11/12 ST RTN FX RTN dB dB dB dB 10 10 10 10 MAIN dB 10 Master Controls 31. PHANTOM POWER SWITCH If the microphones need phantom power, press in this switch to add phantom power to all the XLR microphone inputs of the mixer. This lets the mixer send low-current DC voltage to the mic's electronics through the same wires that carry audio. The LED will turn on as a reminder that phantom power is engaged. Most modern professional condenser mics require phantom power. 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. Never plug ­s­ ingle-ended (unbalanced) micro­phones, or ribbon microphones into the mic input jacks if phantom power is on. Do not plug instrument outputs into the mic input jacks with phantom power on, u­ nless you know for certain it is safe to do so. 32. POWER LED This LED comes on when the mixer is plugged into the AC mains supply, and the rear panel power switch [2] is on. O OO 5 5 5 U U U 5 5 5 10 44 10 4510 20 20 20 30 30 30 40 40 40 50 50 50 60 60 60 5 U 5 4610 20 30 40 50 60 5 U 5 4710 20 30 40 50 60 OO OO OO If the LED does not turn on, make sure the AC power is live, both ends of the power cord are correctly inserted, the electricity bill has been paid and the lights in town are on. 33. METERS These meters have 2 columns of 12 LEDs each, with dB markings from -30 to +15, and OL (overload at +20 dBu). They indicate the stereo signal strength of the main mix after the main fader [47]. Typically, these meters should be bouncing between the "0" and the "+3" LEDs. It is okay if the OL LEDs light occasionally, but if they light frequently or continuously, turn down the main fader until they blink occasionally or not at all. Remember, audio meters are just tools to help a­ ssure that the levels are "in the ballpark." You don't have to stare at them (unless you want to). Owner's Manual 21