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Channel EQ
The mono channels feature 3-band EQ +/-15dB.
Mids are swept from 80Hz to 8kHz with 2.5kHz
highlighted in the graphics as (our) standard mid
frequency. The HIGH EQ is shelving at 12kHz
and LOW EQ shelves at 80Hz. The stereo chan-
nel EQ is 4-band +/-15dB with fixed mids at
250Hz and 2.5kHz. +/-15dB and LOW EQ are
the same as the mono channels.
Setting the channel EQ, like setting the GAIN
levels, is best done during a sound check. In this
case however, the less you vary things above or
below "0," the better. +/-15dB represents consider-
able level change. If for example, you need to turn
down the HIGH EQ on a channel, perhaps due to
a persistant feedback problem with that mic, you
may need to counter-adjust the level fader. In any
case, big boosts are probably best avoided.
One cure for a bad feedback problem is to insert (see INSERT Jack) a graphic or parametric EQ into the
problem channel and adjust it to attenuate only the feedback frequency. That way, fewer innocent frequencies
will be affected. However, the channel EQ's MID SWEEP control can often be used quite effectively to perform
a similar function. Simply set the MID at about -6dB then rotate the SWEEP control until the feedback stops.
Now turn the MID up slightly to normalize the frequency response as much as possible without feedback.
MON1 & MON2 Sends
These are pre-fade, post-EQ sends. Internal routing is...
1. to the MON masters and SOLO buttons
2. to the MON1 and 2 EQs
3. to the MON1 and 2 LINE LEVEL OUTPUTS
4. through the cutoff switches in the AMP C and D AMPLIFIER INPUTS
5. to the built-in, 275-Watt amplifiers C&D and finally
6. to the MON1 and 2 POWER AMPLIFIER OUTPUTS.
Dual monitor systems permit setting up two zones of coverage. Certain channels may be isolated through one
system or at least mixed extra loudly through it. For example the vocalists might want to hear themselves pre-
dominantly through their monitors. The other system might carry a more generalized mix for the rest of the band's
monitors. Remember that the channel MON1&2 send controls are affected by the channel EQ, but NOT the
fader. When feedback sets in, it's often the monitors, not the mains, although it comes through both systems so it's
hard to tell. When it happens, turn down the suspect channel's MON sends. You'll probably kill the feedback and
that channel's level through the main PA can remain unchanged. Now you can adjust the MON1 or MON2 EQ
then turn that channel's MON send back up (carefully, you may still have some EQ-ing to do).
AUX Send
The channel AUX send is post-EQ & post-fader. Internal routing is
1.
to the AUX SEND master and CLIP LED, and
2.
to the AUX SEND jack.
Since the AUX sends are post-fader, any changes to the channel fader levels will result in changes to
the AUX send levels. Therefore the AUX sends are useful for adding external effects (there are also ste-
reo AUX RETURNS,) and for mono recording purposes such as speeches, a demo record rhythm track,
etc. which do not require effects or graphic-EQ (this is a pre-effects, pre-EQ dry signal).
EFX1 & 2 Sends
Like the AUX send, these are post-fader and post-EQ. The EFX1 send is internally routed...
1.
to the EFX1 SEND master fader,
2.
to the internal digital effects system and EFX MODE switch,
3.
to the EFX1 RETURN masters.
The EFX2 send is routed
1.
to the EFX2 SEND master fader, and (simultaneously)
2.
to the EFX2 SEND jack and the EFX MODE button below the effects select dials.
POWERMAX effects can operate either as two discreet mono effects systems with sixteen presets
each, or as a single stereo system with a total of 255 presets. In MONO mode you can, for example, have
reverb on the EFX1 system and a special effect on EFX2. These would be mixed together on the main and
monitor signals by the EFX RETurn to L&R and MON1 & 2 masters.
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