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EFFECTS LOOP: The effects loop in the Quad is a Stereo loop with a “mono” (or single) send and
“Stereo” (or two) returns. It is equipped with a "Low Level/Line Level" switch that makes for easy
interfacing with virtually all effects. When using floor pedals or "inexpensive" rack effects, "Low
Level" position would be correct. When studio quality rack effects are in use, the Line Level
position will probably be better suited. Most of today’s rack mount effects incorporate a similar
switch so make sure the switch on the Quad coincides with wherever your effects headroom/input
level control/switch is set.
Another popular way to interface effects with the Quad is to use one (or both) of the main out jacks
as an effects send. By using this set-up, you gain a little more flexibility with the effects input level
because the "Output" Control(s) located on the lower right corner of the front panel become
"effects send" level controls as well as output volume masters.
For best results, set your lowest stage volume at about 3 1/2 on the Output controls and your first
effect so it has about 30% headroom left. Then set your highest stage volume about 5-5 1/2. This
should increase the volume 20% as well as raising the input level of your effects about the same
amount. Different effects may require slightly different setting but this should be close. If more
adjustment is necessary, adjust the last effects output control of the power amp input attenuator.
You may notice a normal increase in tone and overall quality in sound using this way of interfacing
effects. If so, great! If not, it makes life simple to just have one knob to turn on stage to increase or
decrease your volume.
EXTERNAL MIDI SWITCHING: These eight jacks control all the functions of the Quad. They can
be used to turn on each mode, take in and out the graphic equalizers and boost or cancel the
reverb. A standard grounding "type footswitch" will activate each function. This can come in very
handy should you ever get caught without the Fu-2 footswitch or its accompanying cable. We
suggest that you carry at least two standard grounding footswitches as part of your spare cord
bag. A Mesa Lead/Rhythm or Rhythm 2 footswitch will work perfectly for these functions. Should
you ever need them, 1 rhythm mode and 1 lead mode could then be accessed in this manner.
Another great reason to have a footswitch or two is that the "mode mix" function or two modes at
once is very easy to accomplish using an additional footswitch to add a mode to any sound you
are currently using. A player can be using Rhythm 1 and hit the external switch to add Lead 2.
This brings us to the second reason for these jacks. By connecting these jacks to a midi patch bay
or switching system such as the Mesa Midi Matrix, a mode/modes and the EQ/Reverb functions
can be called up under a program number.
Keep in mind the Master and Lead Masters control the amount of signal fed to the effects loop.
Should you find the levels too weak or too hot, adjust these controls accordingly. We've found
around 11511 on the Masters and 11311 on the Lead Masters to be appropriate for most effects.
MAIN OUT
These jacks, A and B are the outputs for the Quad. They each capture both Channel 1 and
Channel 2 of the Quad.
The signal strength here is controlled by the two "Output" controls on the lower right corner of the
pre-amp. Via these controls a signal perfect for any power amp and most effects (See "Effects
Loop") should be attainable.
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