User manual MACKIE U420

[. . . ] 4-Channel Line Mixer with FireWire OWNER'S MANUAL 1 U -14 U +14 LEVEL SET 2 U -14 +14 U POWER -14 3 U +14 U LEVEL SET 4 U -14 +14 U GAIN GAIN EQ HIGH EQ HIGH L KILL R OL 10 7 KILL KILL +10 U +10 U +10 U KILL +10 U MID KILL 4 KILL MID KILL +10 U +10 U 0 4 10 +10 U KILL +10 U LOW KILL 20 KILL LOW KILL +10 +10 +10 KILL +10 AUX O O AUX MAX O O O O MAX O O MAX FW IN PHONES MAX O O MAX O O MAX U LEVEL U LOOP OUT U LEVEL U O O MAX O O MAX O O MAX O O MAX O O MAX U. 420 4-Channel Line Mixer ImportantSafetyInstructions 1. Donotblockanyventilationopenings. Installinaccordancewiththe manufacturer'sinstructions. Donotinstallnearanyheatsourcessuchasradiators, heatregisters, stoves, orotherapparatus(includingamplifiers)thatproduceheat. Donotdefeatthesafetypurposeofthepolarizedorgrounding-type plug. Apolarizedplughastwobladeswithonewiderthantheother. [. . . ] · · The aux output is affected by the gain, EQ, and aux level of each channel. The aux output is not affected by the level control of each channel, and it is independent of the main mix bus. 14. MID EQ This gives up to 10 dB of boost for frequencies centered around 1 kHz, and the mid range is muted in the kill position. Midrange EQ is often thought of as the most dynamic, because the frequencies that define any particular sound are almost always found in this range. 15. LOW EQ This gives up to 10 dB of boost for the frequency range below 300 Hz, and the lows are muted in the kill position. The frequency range below 300 Hz represents the realm of bass drums, bass guitar, fat synth patches, and lower down to some really serious male singers. For an example, you could set up a stage monitor for the guitar player. Set all aux level controls to minimum, then turn up the guitar channel's aux level to suit. Any adjustments of the level [17] or main level [23] will not affect the stage monitor level, so your guitar player will be happy, and that is always a good thing. LEVEL These level controls allow you to adjust how much of the channel signals appear on the main mix bus. Adjust these carefully to acheive a nice blend in your main system and headphones. Owner's Manual 1 U. 420 4-Channel Line Mixer 1 U -14 U +14 LEVEL SET 2 U -14 +14 U POWER -14 3 U +14 U LEVEL SET 4 U -14 +14 U GAIN GAIN EQ HIGH EQ HIGH L KILL R OL 10 7 KILL KILL +10 U +10 U +10 U KILL +10 U MID KILL 4 KILL MID KILL +10 U +10 U 0 4 10 +10 U KILL +10 U LOW KILL 20 KILL LOW KILL +10 +10 +10 KILL +10 AUX O O AUX MAX O O O O MAX O O MAX FW IN PHONES MAX O O MAX O O MAX U LEVEL U LOOP OUT U LEVEL U O O MAX O O MAX O O MAX O O MAX O O MAX ControlSection 18. POWER LED This will light whenever the external power supply is connected to the mixer and to a live AC mains supply. The mixer does not have a power switch, so as long as the external power supply is connected and operating, this LED should be on. 0. FW IN This control lets you adjust the signal level of the two FireWire channels coming in from your computer, relative to the mix of channels 1 to 4. Adjust it carefully to achieve the desired mix with the other channels. (If the other level controls [17] are down, then the meters will show the level of the FireWire input only. ) The FireWire input from your audio software such as Tracktion, could be individual instrument tracks, a mix of tracks, or processed tracks. 19. METERS These meters have 8 LEDs each, ranging from ­20 to +13. 5 (OL). They indicate the stereo signal strength of the main mix after the main level control [23]. Typically, you want to see these meters bouncing between the "0" and the "+4" LEDs. It is okay if the OL LEDs light occasionally, but if they light frequently or continuously, turn down the main level control until they blink occasionally or not at all. 14 U. 40 4-Channel Line Mixer 1. FW LOOP OUT In addition to a mix of channels 1 to 4, the FireWire output to the computer can contain any FireWire input, if this switch is down. (The mains and phones are not affected by the switch, and always provide a full mix of 1 3 4 channels 1 to 4 and2the 2-channel FireWire inputs. ) U . [. . . ] The return ground shipment is covered for those units deemed by us to be under warranty. Note: You must have a sales receipt from an authorized Mackie dealer for your unit to be considered for warranty repair. IMPORTANT: Make sure that the Service Request Number is plainly written on the shipping carton. LOUD Technologies reserves the right to inspect any products that may be the subject of any warranty claims before repair or replacement is carried out. [. . . ]