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Rear Panel
REPLACE FUSE
ONLY WITH SAME TYPE
AND RATING !
33 34
33 AC SOCKET:
Connect an AC cord here
CAUTION:
Ensure you use an intact AC cord with an insulated plug only!
Before you power the amp up, ensure the voltage value printed beside the
AC socket corresponds to the available current.
34 AC Fuse Box
Contains mains fuse (rear chamber) and spare fuse (front chamber).
NOTE: E
nsure replacement fuses bear identical ratings (refer to the table)!
35 Footswitch Master A - B; Style open - focused
1/4" Stereo jack designed to take a dual footswitch (e.g. ENGL Z-4) for the following functions:
1. Switching between the two Master volume controls A and B (mono terminal);
2. Switching between the Sound-Style "open" and "focused" (stereo terminal).
36 Footswitch Channel Ch I - Ch II ; Gain Lo - Hi
1/4" Stereo jack designed to take a dual footswitch (e.g. ENGL Z-4) for the following functions:
1. Channel switching between Main Channel I and Main Channel II (mono terminal);
2. Gain Lo - Hi switching (Clean -> Crunch or Lo Lead -> Hi Gain Lead) (stereo terminal).
37 Custom Footswitch Port
Connect the ENGL Custom Footswitch Z-5 (optional) to this port (Sub-D, 9-pin). This special footswitch
lets you activate the four channels (Clean, Crunch, Lo Lead, Hi Lead) directly via dedicated buttons.
Master A/B and Sound Style are activated via two additional buttons. When the Z-5 footswitch is
connected, the Channel I/II, Gain Lo/Hi and the Sound Style open/focused buttons on the front panel
as well as footswitch Jacks 35 and 36 are disabled.
38 Noise Gate Threshold
This knob activates an onboard Noise Gate serving to suppress excess noise in the lead channel
when you twist it to the right past roughly the 9 o'clock position.
Set the desired threshold within the range of 9 o'clock to 5 o'clock. The Noise Gate kicks in
when the noise level reaches the threshold that you have dialed in. The further you rotate
the knob to the right, the higher the threshold - that is, the level at which the Noise Gate activates.
39 F.X. Loop Send
Signal output for the Effects loop. Connect this output to a signal processor's
input/return jack via a shielded cable with 1/4" plugs.
40 F.X. Loop Return
Signal input for the Effects loop. Connect this input to a signal processor's
output/send jack via a shielded cable with 1/4" plugs.
41 Balance
FX mix control for the Effects loop: Rotate the knob to the "DRY" position for the pure amp signal,
i.e. no effect on the signal. Turn clockwise to blend in an effect connected to the loop to the dry signal
(parallel/passive). At the "EFFECT" position, only the wet signal, i.e. the signal sent from the FX device is
fed to the power amp (serial/passive).
NOTE: If no effects processor is connected to this loop, leave this control in the "DRY" position!
42 Poweramp Output 4 Ohms parallel
4 ohms speaker o
utput jacks, internal parallel signal path for the connection
of one 4 ohms cabinet or two 8 ohms speaker cabinets.
43 Poweramp Output 8 Ohms parallel
8 ohms speaker ou
of one 8 ohms cabinet or two 16 ohms speaker cabinets.
44 Poweramp Output 16 Ohms
16 ohms speaker output jack, for the connection of one 16 ohms speaker cabinet.
NOTE:
Never operate the amplifier without a sufficient load, otherwise you may damage or
destroy the power amp! Ensure your cabinet's specifications match the respective output's specs.
Possible speaker cabinet options: 1 x 4 or 2 x 8 ohms or 1 x 8 ohms or 2 x 16 or 1 x 16 ohms.
Custom
Noise Gate
Footswitch
Footswitch
Lead Channel
Port
CAUTION !
Master
Channel
Connect To
Style
Gain
Off-Lo
Hi
Custom
Footswitch Z-5
Threshold
Only !
35 36
37
38
tput jacks, internal parallel signal path for the connection
CAUTION !
F.X.Loop
DO NOT OPEN !
RISK OF ELECTRIC SHOCK !
DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE !
Dry Effect
Send
Return
Balance
39 40 41
!
R
100 W All-tube Guitar Head Amp
Powerball
T
YPE
E645
designed by Horst Langer
MADE IN GERMANY
4
Or
8
4 Ohms Parallel
1 x 4 Ohms
2 x 8 Ohms
42
Poweramp Output
And
8
Or->
8
Or
16
And
16
16
8 Ohms Parallel
16 Ohms
1 x 8 Ohms
2 x 16 Ohms
43
44
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