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Firstly,
It really helps if you have one of these, a graphic EQ. When first ringing out a system I always start with a test CD, with frequencies running from 50Hz all the way up to 18K. I also have a sample of pink and white noise to work with. This assists to find the nulls or dips within your PA system, you just play through your 30 secs snippets of the sine waves and adjust accordingly.
Secondly, it is extremely important to have good reference music, something that is similar to what you will be mixing that night, and also something that you know that music inside out and that you've used it before in many different sound systems, car stereo's, pa's etc. By really knowing this music and it's sound in the different spaces, this is your key to EQing your PA system to compliment the performance space your working within.
Thirdly, I've found this chart really useful, when doing sound check with bands. You can always ask what note or key they're playing in, and pull out the opposing frequencies to that note/key. Eg. in the key of A, pull out 440Hz, 880Hz, etc etc...
C C# D D# E F F# G G# A A# B
32.7 34.6 36.7 36.9 41.2 43.7 46.2 49 519 55 58.3 61.7
65.4 69.3 73.4 77.8 82.4 87.3 92.5 89 104 110 116.6 123.5
131 139 147 155.6 165 175 185 196 208 220 233 247
262 277 294 311 330 349 370 392 415 440 466 494
523 554 587 622 659 698 740 748 830 880 932 988
1047 1109 1175 1245 1319 1397 1480 1568 1661 1760 1865 1976
2093 2218 2349 2489 2637 2794 2960 3136 3322 3520 3729 3951
4186 4435 4699 4978 5274 5588 5920 6272 6654 7040 7459 7902
8372 8869 9397 9956 10548 11175 11839 12544 13289 14080 14917 15804
16744 17740 18794 19912 21096
PS hey rhythmboy, could you please help me with my frequency table, it looks good before the save and then it goes all skeways :bang:
EQing Gold
As you can see the layout of the chart above is that you have the key C through to B, and the opposing frequencies sitting directly underneath it. With the combination of this chart, your familiar reference CD, and the Test CD for ringing out the PA. Also use your voice as a reference as you know the sound of this always, and it remains fairly constant from day to day.
I also found this at www.har-bal.com, this is another helpful chart assisting you with ranges of instruments and /or voice, so you know the range you will be EQing to.
If anyone has any other tips/helpful hints to add, more than happy to hear about them.
MOJOE
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