42 Ground Lift Switch; Midi Section And Footswitch Ports - Engl INVADER II Operator's Manual

same ratings as the original fuse! To this end, please refer to the fuse ratings shown
on the type panel.

42 Ground Lift Switch

This switch severs the circuit connecting the amp's internal ground to the wall
receptacle's ground terminal. You can set the switch to Ground Floated when you
have connected a signal processor or power amp and want to prevent the two devices'
grounds from forming a ground loop that manifests in annoying humming.
A ground loop is an extraordinary condition. Under ordinary
Please note:
circumstances, ensure the button is set to Ground to earth the amp to the mains
ground, thereby preventing ungrounded line noise!
43 MIDI Thru
This 5-pin DIN port patches incoming MIDI data from the MIDI In (44) to any other
connected MIDI device.
44 MIDI In
This 5-pin DIN port accepts data sent by a MIDI sender (for example, the ENGL MIDI
Z-12, Z-15, or Z-9 foot controllers) or from or routed through another MIDI device.
Switch no. 45 lets you activate the amp's power supply if you have an ENGL MIDI foot
controller connected to this port.
Before you connect any other MIDI footswitch or effects device, always
CAUTION:
make sure that switch no.45 is set to the right to avoid damaging the device.
45 Power Supply For The ENGL MIDI Footcontroller
This selector activates a MIDI In port power supply for connected ENGL MIDI foot
boards. Power is fed to the board via the MIDI circuit. When the switch is set to the left
position, power is routed to the MIDI In port's pin 1 and pin 2 (refer to page 35 fo r pin
assignments). If you choose to use another MIDI foot board, be sure to set the switch
to the right to avoid damaging it. If the foot board you are using is designed to handle
phantom power, consult its operating manual to learn how it is wired (that is, which
pins carry its power supply) and what its voltage and current specifications are. If the
voltage and current specifications and wiring match, you may set the switch to the left
to power this foot board via the MIDI cable.
Note that a MIDI foot board may not draw more than 200
Please read and heed:
milliamperes of current if you want to power it via this port. You must also check and
verify if this MIDI foot board is able to handle 11 volts of alternating current (AC)! If
you are in any doubt, be sure to consult a specialist, meaning an amp technician or
electronics engineer who earns a living with a screwdriver!
46 MIDI Channel, MIDI Controller, Amp Mute
Use this DIP switch to assign the MIDI channel by which the amp's MIDI system will
receive program change commands and specific MIDI controller commands assigned
to certain amp functions.
Your choices are the standard 16 MIDI channels numbered from 00 to 15, as well as
OMNI mode, whereby all MIDI data is received regardless of the MIDI send channel.
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