Stereo Channel Strips
The Onyx4·Bus mixers each have two stereo channels. The stereo channels have a pair of 1/4＂TRS line input connectors.
The stereo channels can be used as mono or stereo line-input channel strips, or to return the signal from an external effects processor connected to an Aux Send (if you want to apply EQ or more flexible auxiliary routing to the signal than is available with the Stereo Returns). These versatile channel strips are nearly as full-featured as the mono channel strips.
19. GAIN Control
If you haven’t already, please read “Set the Levels” on page 5.
The GAIN control adjusts the input sensitivity of the stereo line inputs. This allows the signal from the outside world to be adjusted to optimal internal operating levels.
There is 20㏈ of attenuation with the knob turned all the way down, ramping up to 20㏈ of gain fully up, with a “U” mark at 12:00.
20. HIGH EQ
This control gives you up to 15㏈ boost or cut above 12㎑, and it is also flat at the center detent. Use it to add sizzle to cymbals, and an overall sense of transparency or edge to the keyboards, vocals, guitar, and bacon frying. Turn it down a little to reduce sibilance, or to hide tape hiss.
21. HIGH MID EQ
Short for “midrange,” this knob provides 15㏈ of boost or cut at 2.5㎑. 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. The HIGH MID EQ frequencies include the female vocal range as well as the fundamentals and harmonics for many instruments.
22. LOW MID EQ
This is a second midrange EQ control that provides 15㏈ of boost or cut centered at 400㎐. This includes the male vocal range and the fundamentals of some lower instruments (guitar, lower brass).
23. LOW EQ
This control gives you up to 15㏈ of boost or cut below 80㎐. The circuit is flat (no boost or cut) at the center detent position. This frequency represents the punch in bass drums, bass guitar, fat synth patches, and some really serious male singers.
24. EQ IN/OUT Switch
This is a true hardware bypass of the Perkins EQ circuitry to insure that there is no coloration of the signal if the EQ is not needed. When this button is out, the EQ controls have no effect on the signal. You can use this switch to make an A/B comparison between the EQ’d signal and the signal without EQ.
25. AUX Sends
These tap a portion of each channel’s signal out to an effects processor or for stage monitoring. The AUX Send levels are controlled by the AUX SEND MASTERS knobs [55].
26. PAN
PAN adjusts the amount of channel signal sent to the left versus the right outputs. On the stereo channels, the PAN knob works like the balance control on your home stereo (panning left turns down the right channel, and panning right turns down the left channel).
27. MUTE
Press this switch mute the channel. This disconnects the channel’s signal form all the Groups, the Main Mix, and Aux Send buses (pre and post-fader). You can still solo the channel in PFL mode when the MUTE switch is pushed in.
28. Stereo Fader
The fader controls the stereo channel’s level, from off to unity gain at the “U” marking, on up to 10㏈ of additional gain.
29. Signal Level LEDs
These LEDs indicate the sum of the channel’s left and right signal levels after the GAIN and EQ controls, but just prior to the channel’s fader. So even if the fader is turned down, you can see if a signal is present.
If you’re followed the “Set the Levels” procedure, the –20 and 0 LEDs should light frequently, the +10 LED sould light occasionally, and the OL (Overload) LED should not light at all. If the OL LED is blinking frequently, the signal is probably distorted from overdriving the input. Either turn down the GAIN control or turn down the signal at its source.
30. GROUP and MAIN MIX ASSIGN Switches
Alongside each channel fader are three buttons referred to as channel assignment switches. Used in conjunction with the channel’s PAN knob, they are used to determine the destination of the channel’s signal.
The stereo channels are assignable to GROUPS 1-2, 3-4, and the MAIN MIX. With the PAN knob [26] at the center detent, the left and right stereo signal is equally balanced. To feed only one side or the other, turn the PAN knob accordingly.
31. PFL Solo Switch
Like the PFL switch on the mono channels, this switch allows you to hear signals through your headphones or monitor outputs without having to route them to the MAIN or GROUP mixes. Since this is Pre-Fader Listen, you can listen to the stereo signal even when the channel fader is turned down. Unlike the mono channel PFL, the stereo channel PFL is a stereo signal (post-pan control), and therefore retains its left and right stereo image in the headphones and monitors, and appears on both LEFT and RIGHT meters.
The Rude Solo LEDS [43] below the meters indicate which solo mode is active.
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