Mackie SR408 / SR568 Owner's Manual - Page 22

U -15 +15 U -15 +15 2.5k EQ HI 12k HI MID 700 6k FREQ 500 15k U -15 +15 250 LOW MID 70 700 FREQ 45 3k U -15 +15 LOW 80Hz HPF 150 EQ IN 75 220 45 350 FREQ 30 800 LR PAN 40 MUTE dB 5 1-2 U 3-4 5-6 5 7-8 CENTER L-R 50 60 OO SOLO LOW MID and FREQ The LOW-MID EQ has a fixed bandwidth of 1.5 octaves. The LOW-MID knob sets the amount of boost or cut up to 15dB, and is flat at the center detent. The FREQ knob sets the center frequency, sweepable from 45Hz to 3kHz. +15 +10 +5 0 -5 -10 -15 20Hz 100Hz 1kHz 10kHz 20kHz +15 +10 +5 0 -5 -10 -15 20Hz 100Hz 1kHz 10kHz 20kHz LOW 80HZ The LOW EQ provides up to 15dB boost or cut at 80Hz and is flat at the center detent position. This frequency represents the punch in bass drums, bass guitar, fat synth patches, and some really serious male singers. Used in conjunction with HPF , you can boost the LOW EQ without injecting a ton of infrasonic debris into the mix. In fact, we recommend using the HPF feature on all Channels at all times. +15 +10 +5 0 -5 -10 -15 20Hz 100Hz 1kHz 10kHz 20kHz EQ IN Point Before: INSERT RETURN (switch up), EQ output (switch down) Point After: MUTE switch, PFL to Channel Meter and SOLO . If the switch is up, the EQ won't work. If it's engaged (down), the EQ will work. The favorite use of an EQ switch is to compare a signal modified by EQ to the unmodified signal, to determine if your EQ settings are taking you where you want to go. As mentioned earlier, the EQ boost/cut controls are all flat (no boost or cut) at their center detents, so this switch could actually be engaged all the time. Be aware that the HPF feature is switched independently of this EQ IN switch. HPF and FREQ Point Before: Channel mic/line preamp, 0/ (polarity reversal) . Point After: Channel path at INSERT SEND , PRE switch (AUX 1-4) . Be aware that signal path placement of the HPF circuit is not as it might appear by looking at the console's controls. It's actually right after the MIC/LINE IN preamp and before the INSERT (outboard gear also appreciates the effects of HPF), but we feel strongly about using HPF as part of your EQ arsenal. That's why the HPF controls are in the EQ section. +15 +10 +5 0 -5 -10 -15 20Hz 100Hz 1kHz 10kHz 20kHz The HPF (high pass filter) switch, often referred to as a low cut filter, cuts bass fre- quencies at a rate of 12dB per octave below a swept-select point, ranging from 30Hz-800Hz. Using HPF will clean out the "mud" in your mix, can help reduce the possibility of feed- back in live situations, and help to conserve amplifier power. We recommend that you use low cut on every sound source, and adjust the frequency point to match the characteristics of the sig- nal. For instance, if the signal is a kick drum, bass guitar, bassy synth patches, or recordings of earthquakes, set the FREQ knob fully down at 30Hz. The difference will be virtually inau- dible and your amplifiers will love you for it. 22