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21 Middle open
Mid-range voicing control of the preamps´s passive EQ for Main Channel II, Lo and Hi Lead. This
control determines the response of a specific mid frequency range when sound style "open" is selected.
22 Middle focused
Mid-range voicing control of the preamps´s passive EQ for Main Channel II, Lo and Hi Lead. This control
determines the response of a specific mid frequency range when sound style "focused" is selected.
TIP from the Designer:
Try the open and focused voicings out for different applications. As the names suggest, open gives you
a more expansive sound that is excellent for grinding out heavy-duty riffs, while focused brings up the
low mids, making it a great choice for leads.
23 Treble
Upper range voicing control of the preamps´s passive EQ for Main Channel II, Lo and Hi Lead.
TIP from the Designer:
To help you get acquainted with the amp's fundamental sounds, I recommend that you set all tone
controls to the center or 12 o'clock position. For high Gain Lead sounds, your best bet is to turn the
Treble and the Presence knobs well down to prevent the pickups and speakers from interacting at hi
levels and generating feedback (the recommended setting is somewhere in the 9 to 2 o'clock range).
Since the two knobs sweep through different frequency ranges and influence the signal at different
places in the amp's internal signal chain, you can dial in different combinations of treble and presence
settings to come up with many interesting sonic variations.
24 Lo Lead Volume
Volume control for the Lo Lead channel (pre-FX loop, influences the Send level). The red LED beside this
control indicates Lo Lead operating mode.
25 Hi Lead Volume
Volume control for the Hi Lead channel (pre-FX loop, influences the Send level). The red LED beside this
control indicates Hi Lead operating mode.
26 open/focused
This button lets you select from two differnt voicings. Choose open for a looser, focused for a tighter
mid-range voicing. Twist the appropriate knob (open knob 21, focused knob 22) of Ch II to tweak the
selected mids voicing to taste. This sound shaping feature affects all four channels (Clean, Crunch, Lo
Lead and Hi Lead). You can also activate this function via a respective footswitch connected to jack 35
or 37. When a footswitch is plugged in, the front panel sound style button is disabled.
27 Ch I/II
Main Channel selector pushbutton; selects Main Channel I or II and, depending on the Gain selector
pushbutton setting 28 it activates the Clean, Crunch, Lo or Hi Lead channels. Off position: Main Channel
I (Clean or Crunch), On position (pushed in): Main Channel II (Lo or Hi Lead). This feature can also be
switched via the Custom Footswitch Port 37 or the footswitch jack 36: the channel selector pushbutton is
deactivated once a footswitch is connected.
28 Gain Lo/Hi (Gain Boost)
When you press this button, the input sensitivity of both Main channels is increased. The Hi-Gain
function switches from Clean to Crunch in Main Channel I, and from Lo Lead to Hi Lead in
Main Channel II. This function can also be activated via a suitable footswitch connected to Jack 36 or 37;
the Gain Lo/Hi button is automatically disabled when you connect a footswitch.
29 Master A
Master volume A for power amp output (located post FX loop). The red LED next to the knob lights up
when this knob determines the master volume level. Master A/B switching can be accessed via a
footswitch connected to jack 35 (e.g. ENGL Z-4) or 37 (ENGL Custom Footswitch Z-5).
30 Master B
Master volume B for power amp output (located post FX loop). The green LED next to the knob lights
up when this knob determines the master volume level. Master A/B switching can be accessed via a
footswitch connected to jack 35 (e.g. ENGL Z-4) or 37 (ENGL Custom Footswitch Z-5).
TIP from the Designer:
This option of using a footswitch to select the two master A and B knobs gives you another interesting
switching alternative: You can dial in two different volume levels and activate them in combination with
the amp's different operating modes (i.e. each of the four channels). That gives you many basic sonic
variations, each of which supports different playing techniques: In effect, you get footswitchable clean
(or slightly dirty) rhythm or chrunch and Lead tones in Main Channel I, and overdriven preamp tones in
Lead mode for power chords or distorted lead guitar in Main Channel II. And by working your guitar's
volume knob, you can expand this palette of tones accordingly.
31 Stand By
Power amp standby switch: Use this switch to silence (0 position) the amp when you take a lengthier
break. The amp's tubes stay warm, which means that it is ready to roll immediately when you switch it
back to full power.
To reset the power tube monitoring circuitry, press the standby switch briefly (see Power Tube Monitor).
32 Power
AC power on/off.
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