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20
Using Equalization
The seven-band graphic master equalizer affects the overall output signal of the TM300.
Its main function is to allow you to “tune” the device to the particular room environment
you are in. Perhaps its most important job is to enable you to eliminate ringing or
feedback problems caused when a microphone is too close to a loudspeaker. To
accomplish this, start with all seven bands flat (that is, all seven sliders at their detented
“0” center position). Then, one by one, raise each slider until you hear the feedback or
ringing markedly increase. This allows you to identify the problematic frequency area
(it will most commonly be one or more of the high mid-range or high frequency areas).
When you’ve located the problem area(s), it’s simply a matter of lowering that slider or
sliders below the 0 point until the ringing or feedback disappears. Don’t lower the
frequency area any further than you need to, or the quality of the overall sound may
suffer. If you don’t specifically need to utilize the TM300’s seven-band graphic master
equalizer in a particular environment, deactivate it by setting one or both EQ on/off
switches to their Off (up) position.
Note that, when the Aux 1 / Monitor switch is pressed in, the TM300 functions in a “split
mono” configuration. In this configuration, the left side of the graphic equalizer
processes the main stereo output (which is internally mixed to mono and routed to the
TM300’s left speaker outputs, normally connected to main PA speakers), while the right
side of the graphic equalizer processes the Aux 1 send output (which is internally routed
to the TM300’s right speaker outputs and normally connected to onstage monitors).
In this way, you can have separate equalization curves for both main (“Front Of House”)
PA speakers and your onstage monitors without the need to purchase an outboard
equalizer (or external power amplifier). See page 12 in this manual for an
interconnection diagram which shows this kind of usage.
+12dB
0dB
6.4KHz2.5KHz1KHz
400Hz160Hz63Hz
15KHz
-12dB
EQ ON/OFF
AUX1/MONITOR
LEFT RIGHT
+12dB
0dB
6.4KHz2.5KHz1KHz
400Hz160Hz63Hz
12KHz
-12dB
6.4KHz2.5KHz1KHz
400Hz160Hz63Hz
15KHz
Seven-band graphic master equalizer
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