How to use the Behringer and Setup Radio Mics
Loading EQ settings
The first thing to do is load the equalisation settings for the
venue that you are in.
- Use the cursors to select am or pm setting.
- Hit the load button (soft button A) 3 times:
(first to select load/save menu, then select load, then select OK to confirm
loading).
Setting feedback destroyers and radio mic
setup
This is a suggested method of setting up radio mics; feel free
to do it any way you want to, as long as it works!
What you are doing to reduce the possibility of feedback is
to cut certain resonant frequencies (where the feedback occurs).
In general terms you want to find where these frequencies are
and apply cut to them. However, you can never remove feedback
entirely - if you turn a microphone up high enough, then it
will feedback. For this reason you should check for feedback
at normal running levels - check a mic at 0, not +10 on the
desk!
Firstly, find the 3 main feedback frequencies and cut them
using the feedback destroyers on the Behringer.
- Select the FB-D menu (soft-button B from main EQ menu).
(If you are in the wrong menu hit the EQ button to get back
to the start of the menus.)
- You should get the following screen as all feedback destroyer setup
is now on 1 menu:
- Switch first destroyer (L and R) to ON (i.e. automatic search). Do this by
moving cursor to FB-D column and press +/-.
- Turn up radio mic until FBD has found the first frequencies
on L & R.
- Switch first destroyer to OFF (i.e. no searching)
- Do the same with the other 2 destroyers.
Common frequencies found by the Behringer: approx 5.5K, 500, and either 8.5K or 200. This will
probably be different with the new (Sennheiser) mics.
- When this is done you should find that the 3 main feedback frequencies are
cut by the Behringer thus meaning that less frequencies have to be cut on the
desk. Find any other frequencies that need cutting by applying cut (of at least
-6) and sweeping through the frequency ranges until found. Most voices will
need a cut of at least -3 on the LF to remove rumble (except Richard).
- During the service you will be able to reduce the amount of cut applied as
lots of people soak up the sound! Gradually reduce the cuts until as flat as
possible (new Sennheiser mics will run fine with no cut except on LF and EQ
unit).
If you do get feedback from the radio mics during the service
- Don't panic - we all get feedback unexpectedly.
- Check that all mics apart from the radio mic in use are muted.
- You'll have found the main areas of feedback already so apply more cut
on desk at the current frequencies.
- (use your ears - it will either be above 5K so
reduce HF, or around 1-5K in which case reduce HMID, or 100-900 in which case
reduce LMID).
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