User`s guide

6
The Rear Panel
9 10 11 12
The rear panel is located inside the open
back of the cabinet, towards the top. It has
connections for the AC power cord, the built-
in speaker, and external speaker cabinets.
WARNING! Never turn on the amplifier with-
out a load, the built-in speaker or external
speakers connected to the amplifier.
9. AC Power Input with Mains Fuse:
The amplifier is equipped with a detach
-
able power cord that plugs into this
IEC Mains socket. The AC power cord
should only be plugged into a grounded
power outlet that meets all applicable
electrical codes and is compatible
with the voltage, power, and frequency
requirements stated on the rear panel
of the amplifier. Do not attempt to
defeat the safety ground connection.
The AC Mains fuse is located in the IEC
Mains socket and is used to protect
the amplifier from electrical faults. If
the fuse needs to be replaced, please
refer to the correct fuse specifications
located on the back panel of the ampli
-
fier. Always unplug the power cord
when changing or inspecting the fuse.
Never bypass the fuse or replace it with
a wrong type or value.
10. 16 OHMS: The built-in 16 ohm speaker
plugs in here.
Alternatively, this output
can power an external speaker cabinet
rated at 16 ohms.
11. 8 OHMS: The two 8 ohms speaker out
-
put jacks are wired in parallel. See the
connection examples on the next page.
12. 4 OHMS: The two 4 ohms speaker out
-
put jacks are wired in parallel. See the
connection examples on the next page.
Using external cabinets
The hookup diagrams on the next page
show some different cabinets, their imped
-
ance, where to plug them in, and the total
load placed on the amplifier.
ALWAYS use good quality (non-shielded)
speaker cable to connect speaker cabinets.
Never use (shielded) instrument cable.
ALWAYS match the amplifier’s speaker
output impedance to the impedance of the
speaker that is being used.
•
Unplug the built-in speaker from the 16
ohm output when connecting external
speakers to the 8 ohm or 4 ohm out
-
puts. To use the built-in speaker and an
external 16 ohm speaker, see the top
left example on the next page.
• Use only one type of impedance output
at a time.
• If more than one speaker is connected
at the same time, make sure they all
have the same impedance rating.
• Never use two or more cabinets with
different impedance ratings. This will
create an unbalanced load.
• When using multiple speaker cabinets
(with the same impedance rating),
match the total load impedance of the
speaker cabinets to the speaker output
of the amplifier.
For equal-impedance speakers connected in
parallel, the first law of rock and roll states:
SPEAKER CABINET IMPEDANCE divided by
NUMBER OF CABINETS = TOTAL LOAD