Mackie ProFX22v2 Owners Manual - Page 11
U like Unity gain, Level Set LED [ProFX8v2 / ProFX12v2], Low Cut Switch
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Owner's Manual "U" like Unity gain ProFXv2 Series mixers have a "U" symbol on almost every level control. It stands for "unity gain," meaning no change in signal level. The labels on the controls are measured in decibels (dB), so you'll know what you're doing level-wise if you choose to change a control's settings. 10. Gain If you haven't already, please read the "Getting Started" section on page 4. Setting the gain correctly will ensure that the preamplifier's gain is not too high, where distortion could occur, and not too low, where the quieter, exquisitely-delicate passages might be lost in background noise. The gain knobs adjust the input sensitivity of the mic and line inputs. This allows signals from the outside world to be adjusted to run through each channel at optimal internal operating levels. For stereo channels (no mic input) the gain control affects the line-level inputs, with 20 dB of gain, and 20 dB of attenuation. Stereo Channels: • ProFX8v2 - Channels 7/8 • ProFX12v2 - Channels 9/10 and 11/12 • ProFX16v2 - Channels 13/14 and 15/16 • ProFX22v2 - Channels 19/20 and 21/22 • ProFX30v2 - Channels 27/28 and 29/30 11. Level Set LED [ProFX8v2 / ProFX12v2] These LEDs are used with the gain control to set the channel preamplifier gain just right for each source. If one or more channels are distorting, check the level set LEDs. If they are on continuously, turn down the gain. For mono channels (mic input with a mono line input), the gain knob adjusts the input sensitivity of the mic and line inputs. 11 10 If the signal originates through the mic XLR jack, there will be 0 dB of gain with the knob fully down, ramping to 50 dB of gain fully up. 12 ProFX8v2 ProFX12v2 Through the 1⁄4" mono line inputs, there is 20 dB of attenuation fully down and 30 dB of gain fully up, with unity gain "U" at 12:00. This 20 dB of attenuation can be very handy when you are inserting a hot signal, or when you want to add EQ gain, or both. Without this "virtual pad," there is more chance of channel clipping. For hybrid channels (mic input and stereo line input), the gain control just affects the microphone input. Hybrid Channels: • ProFX8v2 - Channels 3/4 and 5/6 • ProFX12v2 - Channels 5/6 and 7/8 • ProFX16v2 - Channels 9/10 and 11/12 • ProFX22v2 - Channels 15/16 and 17/18 • ProFX30v2 - Channels 23/24 and 25/26 12. Low Cut Switch All mono channels have a low-cut switch (often referred to as a high-pass filter) that cuts bass frequencies below 100 Hz at a rate of 18 dB per octave. We recommend that you use low-cut on every microphone application except kick drum, bass guitar, or bassy synth patches. These aside, there isn't much down there that you want to hear, and filtering it out makes the low stuff you do want much more crisp and tasty. Not only that, but low-cut can help reduce the possibility of feedback in live situations, and it helps to conserve amplifier power. Another way to consider low-cut's function is that it actually adds flexibility during live performances. With the addition of low-cut, you can safely use low equalization on vocals. Many times, bass shelving EQ can really benefit voices. Trouble is, adding low EQ also boosts stage rumble, mic handling clunks and breath pops from way-down low. Applying low-cut removes all those problems, so you can add low EQ without blowing the woofers. Owner's Manual 11