Addendum
EQ Sweep Control
Although frequency sweep controls have graced the
For example, if you have set a LOW boost, a MID boost swept all the way down to the lowest frequency setting will alter the sound of the lows and increase their volume. Be careful this doesn't damage your woofers. And watch out for your tweeters/horns if you sweep the boost up to the higher settings while the HI EQ is boosted.
Considering that the SWEEP control can alter everything you are
accustomed to an EQ doing, it would be worthwhile to spend some time becoming acquainted with how it works. As music plays through a channel on the mixer and speakers, adjust that channel's MID, first for a boost then for a cut and SWEEP them back and forth. (If there is no MID cut or boost setting, i.e. if it is set at the center position, the SWEEP will have no effect at all). Now repeat the process with that channel's LOW and HIGH EQ controls at various settings (but with the volume at a safe level for the speakers).
Hint: The PowerMAX SWEEP has a home base setting marked with a triangle at the 2.5kHz mark. This approximately corresponds to the setting of the fixed mid controls on our other mixers. Set channels not requiring SWEEP equalization at 2.5kHz and the MID cuts or boosts will have more standard results.
Together, MID and SWEEP controls can be used to accomplish a variety of tasks from combating feedback to improving the way things sound through the PA or on recording. Here are some of those tasks & settings:
Note: These are approximate settings only. Use them as a starting point and tune around them.
•Killing feedback? Set MID at
•Bonky sounding snare drum?
•Boomy bass drum?
•Fwashy sounding cymbals?
•Excessive hiss from guitar, bass or keyboard amp? +3dB @ 5kHz (HI EQ rolled off
•Fading vocal range (notes too low for singer)? +3dB @ 80Hz (LOW EQ rolled off
•Puffing on harmonica mic?
•Rack Toms?
•Floor tom?
Generally speaking, you will probably end up with the MID in cut mode for most problem solving uses of the SWEEP control. In any case you will learn to use this feature judiciously. The best PA EQ setting is the one with the least adjustment, but when you need to solve a problem it's good to know how to use the tools.
EQ MID SWEEP Addendum 01.06.28.99
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