5
Rear panel
operation
“EXT SP 8/16 OHM” connection
An additional or second loudspeaker box can be connected to the "EXT SP" socket. The
impedance of this box can be between 8 - 16 ohms, but should not be less than 8 ohms.
“SPEAKER” connection
The internal loudspeaker of the COMBO is connected to this socket and the
first loudspeaker box is connected to the TOP.
Note:
You can switch off the internal speaker of the combos by disconnecting the plug at the "SPEAKER" connector and
connect one or two external speaker boxes to the "SPEAKER" + "EXT SP" sockets. (These two sockets are connected
in parallel). The optimum impedance matching of the amplifier is 8 Ohm. But it can be between 4 to 16 ohms. The
circuitry of the output stage is designed to handle speaker adaptations from 4 to 16 ohms without any problems.
“TWEETER” switch
The "TWEETER" switch (only in the version with a tweeter) is used to switch the tweeter on and
off in the first channel. In the second channel, the tweeter is automatically switched off.
Note:
The switch can be used in both channels by insert a solder bridge on the main board (only to be carried out by
qualified personnel). The tweeter can then be switched on or off in both channels.
“LINE OUT” connection
The "LINE OUT" output is used for connection to a PA, etc. It is located (via a voltage divider
without frequency response influence) directly at the loudspeaker output of the amplifier.
“SEND” + “RETURN” connections
The "SEND" + "RETURN" sockets can be used to connect all common effect devices. This applies
to both battery-powered pedals and 19" studio equipment. To do this, connect "SEND" to the
input and "RETURN" to the output of the effect unit.
Furthermore, the "SEND" output can be used as line out and the "RETURN" input for controlling
the output stage of the "blue note". Both are directly in front of the "VOLUME" controls of the
amplifier.
