Ampeg B4R - Manual (Page 6)

6
The Rear Panel
23. CIRCUIT BREAKER: The B4R employs an AC line circuit
breaker to help protect against damage due to excessive cur-
rent demands. If the amplifier stops working, check the circuit
breaker. If it has opened, the button will be protruding and
showing a contrasting color. You can reset the circuit breaker
by pushing it in until it latches. The breaker must cool down for
a short time before the button will latch. If the circuit breaker
opens repeatedly, have the amplifier checked by a qualified
service person.
24. AC LINE IN: Firmly insert the supplied AC power cord into
this socket until it is fully seated. This grounded power cord is
to be plugged into a grounded power outlet, wired to current
electric codes and compatible with voltage, power, and fre-
quency requirements stated on the rear panel.
Do no attempt
to defeat the safety ground connection.
25. SPEAKER OUTPUTS: The 1/4” jacks offer a convenient
method of connecting to speaker cabinets using cables termi-
nated with 1/4” plugs. However, when using the amplifier at or
near its full output power, it is recommended that you use the
Speakon
® jacks. Only the middle Speakon ® jack can be used
when operating in the Mono Bridged mode. (heavy duty mono
bridge speaker cable provided - see pages 8 and 9.)
26. FULL RANGE/BIAMP: This switch determines how the
signal is sent to the internal amplifiers. In the Full Range posi-
tion (switch out), a full range signal is sent to both amp chan-
nels. In the Biamp position (switch in), the low frequencies are
sent to Channel A and the high frequencies are sent to
Channel B. (See pages 8 and 9.)
NOTE: When Biamping, the Stereo/Mono switch (#27) must be
set to Stereo. (See pages 8 and 9.)
27. STEREO/MONO: This switch sets the operating mode of
the amplifier. In the “out” position the amplifier is in the Stereo
Mode; with the switch in the “in” position the amplifier is in the
Mono Bridged Mode. (See pages 8 and 9.)
28, 30. POWER AMP INPUTS: These jacks connect directly
to the power amp for use with external preamps. When using
external sources, connect the OUTPUT of the sources to
these jacks using shielded instrument cables to feed the sig-
nals into the power amp sections. The internal signal is dis-
connected when a plug is inserted. In the Mono Mode,
Channel A = Input. In the Biamp Mode, Channel A = Low Input,
Channel B = High Input. (See pages 8 and 9.)
29, 31. PREAMP OUTPUTS These jacks are direct preamp
outputs for use with external power amplifiers, mixing boards,
external effects, etc. Connect the external unit inputs to these
jacks using shielded instrument cables.
Speakon ® is a registered trademark of Neutrik AG.
B4R Bass Amplifier