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DM Music > Knowledge Base > Sound / PA Knowledge > Graphic Equalisers
Graphic Equalisers

Graphic Equalisers are essential!
Instrument EQ Guide
Graphic Equalisers are essential!

Ignore the room at your peril!

Q. Graphics are a luxury aren’t they? Not an essential like monitors or speakers?

A. Graphics are integral to good sound re-inforcement. The mixer, mics etc are all instruments in that they contribute to the sound. Perhaps the most significant instrument is the room itself! Graphic EQ’s addresses the ‘acoustic signature’ of the room, equalising the resonant peaks and troughs in the room - the benefits are no less than dramatic
- more gain before feedback
- mixer EQ’s are more accurate and effective
- radically improves intelligibility

Q. OK How do I set up a graphic?

A. Graphic EQ’s are not tone controls. Graphics are best set with a spectrum analyser. (DM Music will do this as part of an installation.) Some units have built-in analysers or feedback eliminators.
Instrument EQ Guide

The table below is a guide to using the EQ on your mixer. Note every system and every building is different so the below is just a guide for reference.
InstrumentBoostingCuttingComments
Human VoiceHot at 8 or 12KHz Clarity above 3KHz Body at 200-400HzScratchy at 2KHz Nasal at 1KHz Popping p’s below 80HzTends toward thin when blending many voices
PianoPresence at 5KHz Bass at 125HzTinny at 1-2KHz Boomy at 320HzNot too much bass when mixing with rhythm section
Electric GuitarClarity at 3.2KHz Bass at 125HzMuddy below 80Hz 
Acoustic GuitarSparkle above 5KHz Full at 125HzTinny at 2-3.2KHz Boomy at 200HzTry to use a microphone with small diameter
Electric BassGrowl at 620Hz Bass below 80HzTinny at 1KHz Boomy at 125HzSound varies greatly with the strings used
String BassSlap at 3.2-5KHz Bass below 125HzHollow at 620Hz Boomy at 200Hz 
Snare DrumCrisp above 2Kz Full at 125Hz Deep at 80HzAnnoying at 1KHzAlso try adjusting the tension of the snare wires
Bass DrumSlap at 3.2-5KHz Bass at 80-125HzFloppy at 620Hz Boomy below 80HzUsually record with head off. Put blanket inside
Tom TomsSlap at 3.2-5KHz Bass at 80-200HzBoomy at 320HzTuning head tension is very important
Cymbals, bells & tambourinesSparkle above 5KHzAnnoying at 1KHzRecord these at a conservative level
Horns & StringsHot at 8 or 12Khz Clarity above 2KHz Lush at 320-400HzScratchy at 3.2KHz Honky at 1KHz Muddy below 125Hz 

DM Music > Knowledge Base > Sound / PA Knowledge > Graphic Equalisers
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