User manual MACKIE ONYX 4 BUS

[. . . ] PREMIUM LIVE ANALOG MIXERS w/PERKINS EQ & ONYX MIC PREAMPS OWNER'S MANUAL ONYX 4·Bus ImportantSafetyInstructions 1. Donotblockanyventilationopenings. Installinaccordancewiththe manufacturer'sinstructions. Donotinstallnearanyheatsourcessuchasradiators, heatregisters, stoves, orotherapparatus(includingamplifiers)thatproduceheat. Donotdefeatthesafetypurposeofthepolarizedorgrounding-type plug. Apolarizedplughastwobladeswithonewiderthantheother. [. . . ] Once the input level crosses the threshold setting, the G. R. (Gain Reduction) meters begin to light (top to bottom), as they indicate how much gain reduction is being applied to the signal. Note: If the COMP ASSIGN switch [38] is OFF, the COMPRESSOR meters will not indicate any signal. 4. LEFT/RIGHT Level Meters The Onyx 4·Bus Left and Right Level meters are made up of two columns of twelve LEDs, with three colors to indicate different ranges of signal level, traffic light style. They range from ­30 at the bottom, to 0 in the middle, to +20 (CLIP) at the top. The 0 LED in the middle is labeled 0 dB = 0 dBu. You may already be an expert at the world of "+4" (+4 dBu=1. 23 V) and "­10" (­10 dBV=0. 32 V) operating levels. What makes a mixer one or the other is the relative 0 dB VU (or 0 VU) chosen for the meters. A "+4" mixer, with +4 dBu pouring out the back will actually read 0 VU on its meters. A "­10" mixer, with a ­10 dBV . FAST ATTACK The ATTACK setting determines how fast the compressor reacts once the threshold has been exceeded. It also affects the release time, which determines how fast the compressor turns off once the signal falls below the threshold. With the switch up, the attack and release times are calibrated to respond to the overall signal level without the audible "pumping" and "breathing" artifacts that are sometimes associated with compressors. In most cases, this is the setting you would use for live sound and recording applications. There may be some situtations that require a faster acting attack and release. For example, mic'ing a snare drum produces some fast transient peaks that may get through the compressor before it can act on the signal. Pushing in the FAST ATTACK switch allows the compressor to react much faster on quick transient peaks and release the compression quickly between the peaks. You can experiment with both settings to determine which one works best in your application. POWER PREMIUM ANALOG MIXER w/ PERKINS EQ 12V, 0. 5A LAMP PHONES A MATRIX GRP B -20 COMPRESSOR -10 0 0dB=0dBu MAIN MIX LEFT CLIP INPUT G. R. 1 2 3 4 5 6 7 8 9 10 12 15 RIGHT 20 15 10 6 3 1 0dB=0dBu 20 O O CLIP O O MAX MAX -30 +10 15 10 6 THRESHOLD GRP 2 3 4 2:1 O O O O MAX MAX 1. 5:1 5:1 3 0 GRP O O OFF LIMIT LEVEL SET 0 2 4 7 10 20 30 RATIO O O 2 4 MAX MAX OFF MAIN MIX GRP 1-2 GRP GRP 3-4 7 10 20 40. BYPASS COMP Switch When the BYPASS COMP switch is pushed in, the signal bypasses the compressor, but still allows you to see the input signal level to the compressor and the amount of gain reduction applied to the signal on the meters. This is useful when setting up the compressor settings prior to actually engaging the compressor in a live sound application, and for making A/B comparisons between the compressed and uncompressed sound. O O MAX O O MAX COMP ASSIGN O O 30 MAX O O LEFT MAX PFL AFL FAST ATTACK O O BYPASS COMP RUDE SOLO MAX O O RIGHT MAX O O +15 O O +15 O O MAX O O MAX O O MAX O O MAX MASTER STEREO AFL AFL PHONES MONITOR SOLO LEVEL MONO TB ASSIGN MAIN TO MON MAIN MIX AUX 1-2 AUX 3-4 AUX 5-6 O O TALKBACK MAX 16 ONYX 4·Bus signal trickling out will read, you guessed it, 0 VU on its meters. Mackie mixers show things as they really are. When 0 dBu (0. 775 V) is at the outputs, it shows as 0 dB VU on the meters. [. . . ] Remember: Only mult or "Y" an output into several inputs. If you need to combine several outputs into one input, you must use a mixer, not a mult or a "Y. " tip sleeve this plug connects to one of the mixer's Channel Insert jacks. "to ring" RETURN from processor Using the Send Only on an Insert Jack If you insert a 1/4" TS (mono) plug only partially (to the first click) into a Mackie insert jack, the plug will not activate the jack switch and will not open the insert loop in the circuit (thereby allowing the channel signal to continue on its merry way through the mixer). Y-Cord Splitter 8 ONYX 4·Bus DB25Connectors The DIRECT OUTS on the back of the Onyx 4·Bus provide balanced direct outputs for all the mono channels on female DB25 connectors. These connectors are pin-for-pin compatible with the analog (not TDIF) DB25 connectors found on TASCAM DTRS recorders, which has become an industry standard for many professional audio manufacturers. They are also the same pinout as the analog cards for the Mackie D8B and hard disk recorders. Owner's Manual Several companies make DB25-to-DB25 cables specifically for audio, with proper shielding to reduce crosstalk and noise. [. . . ]