Up/Down switching, while the stereo terminal controls Clean/Crunch and Lead (3)/
Lead (4) feature (for pin assignments, see page 23).
This control knob activates an onboard Noise Gate serving to suppress excess noise in
the two Lead channels (3) and ) when you twist it to the right, near or just
beyond the 9 o'clock position.
In addition the Noise Gate can be controlled remotely (on/off) via a footswitch
connected to jack 38 (for details refer to chapter 38) or via the ENGL Custom
Footswitch Z-9 (refer to chapter 37 for details). The precondition for a Noise Gate
remote control via footwisch is a setting at the Threshold knob beyond the 9 o'clock
position (primary activation).
Use this knob to set a threshold value (that is, the noise level) at which the Noise Gate
activates to suppress the signal within the 9 to 5 o'clock range. The further you twist
the knob to the right, the higher the signal level at which the Noise Gate kicks in. If you
set the knob to the 5 o'clock position, the Noise Gate reacts to extremely high noise
levels, meaning that there's not much of a margin between the guitar signal and
background noise.
Noise is a definite no-no in many situations. For example, studio etiquette demands
that you keep a lid on extraneous noise during short breaks. It's in the nature of high-
gain rigs to generate undesirable peripheral noise in overdriven (high gain) channels.
This is attributable to the physical properties of an amp's constituent components, in
particular its active components. That's right; those cherished tubes are the culprits.
The Noise Gate is a tool that lets you silence this noise during breaks by way of signal
mute circuit. Note that electric guitars pick up interference signals, and these are
amplified tremendously at high gain levels in Lead mode. The most common source of
noise is 50 Hz or 60 Hz (hertz/cycle) mains hum, particularly when the guitar is
positioned near transformers and power units. Because in worst-case scenarios this
humming can attain extremely high levels, the Noise Gate can hardly distinguish
between the musical signal and noise. This makes it hard to find the right Threshold
setting. It is entirely possible for this humming and other noise to rise to a level that
deactivates the Noise Gate and therefore becomes audible. My advice is to stay as far
away from transformers and power units as space allows.
: The may open up inadvertently
when the is activated, a high-gain Lead channel is selected, and the volume
exceeds the Threshold knob setting. At very high volume and gain settings, this may
generate instant feedback, particularly if your guitar is facing the speakers. Rather
than musical and controlled, this is the shrill, unpleasant and potentially harmful
variety of feedback squealing that sends your audience and fellow musicians packing.
Though the amp is not more susceptible to feedback when the is activated,
the fact that it suppresses extraneous noise means you can't hear those telltale signs
that feedback is swelling and consequently can't take measures to suppress it. For this
reason, make an extra effort to be careful when the is activated: Before
you approach the amp and speaker cabinet with your guitar in hand, turn the guitar's
volume knob to the far left position (to 0 so that no signal is audible) to prevent the
pickups and speakers from interacting!
41 NOISE GATE THRESHOLD LEVEL
A tip from the designer:
IMPORTANT note; please read and heed
Lead Lead (4
Noise Gate
Noise Gate
Noise Gate
Noise Gate
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