Post by Gordon 101I have seen some use a 31 band eq. and individually boost each freq.
to the point of ringing. I don't think this is a good idea, but?
This technique can work quite well as long as you have a steady and
quick hand on the EQ sliders. Here's the deal:
Do this before sound check, and tell anyone in the room what you are
about to do. Start with the monitor graphic EQ flat. You have a vocal
mic open, and are sending it to the nearest monitor wedge. You raise
the monitor level until you just start to hear ringing (feedback). Pull
back the monitor level just a touch until the ringing stops. Now you
need to pull back the EQ band of that frequency so you can raise the
monitor level and get some more GBF (gain before feedback). You may be
familiar enough to know which frequency is ringing, but if you are not
sure you can use the following method:
Slowly raise each EQ slider until ringing just starts, then pull it
back flat. Do that for each frequency band in the range you suspect.
Make a mental note of how much each slider needed to move. Go back to
the most sensitive band, the one whose slider you needed to raise the
least before ringing started. That should be closest to the frequency
you first heard ring. Now pull it back a few dB below centre. Next,
raise the monitor level again until ringing starts. This is likely to
be at a different frequency. Repeat the above procedure to find the
most sensitive band and then cut it a few dB. To avoid chopping up the
sound too much you should do this for no more than three ringing
frequencies. You should find that you can now increase the monitor gain
quite a few dB above your starting point, and that several frequencies
may start to ring together, a good sign as it proves you have ironed
out the dominant ring frequencies.
This technique is very useful in theatre stage miking, but not always
reliable in close miked rock 'n roll. Things change dramatically when
the band take their places for sound check. You get reflections of
their instruments, clothing and bodies, and often your carefully placed
mic gets whipped off its stand and danced around right in front of the
speakers...
IMO a better method is as follows:
Before sound check, get your number two to help on stage. Get him to
speak enthusiastically into the mic, the usual "Test, One Two, Yeah,
Yeah Yeah...". With the EQ flat, raise the monitor level and ask him
what it sounds like. He may ask for changes to the level or frequency
response to make it more intelligible or get rid of some 'boom', 'mud',
'honk' and so on. Once you are both happy with the level and tone you
should check the available GBF. Do this by raising the monitor level
further until the ringing just starts. Then repeat the previous
procedure to find the offending band on the EQ. Test this with the mic
held and moved as it is likely to be during the show. For example, cup
the capsule with the hand if the singer is likely to use this annoying
technique, swing the mic in front of the monitor if he is one of those
types who engage in stage gymnastics or frequent bowing with the mic
held, test with the mic held close to a wide open mouth, a nice little
cavity that can start a ring around 1k or so. In short... cover all the
possibilities before the band take the stage for the sound check, and
then see what gain you have in hand.
In my experience, an intelligible, clean monitor mix means lower stage
level required. That comes down to good mic and speaker choice and
placement, effective use of the graphic EQ, and putting only what is
required into the mix.
Of course, there are many other ways of doing this, and a lot more to
say. Just my take. Regards,
Carey