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6
The Rear Panel
BI-AMP
SPEAKER
OUTPUTS
HIGH
OUTPUT
LOW
OUTPUT
CHANNEL
B
CHANNEL
A
CHANNEL
B
CHANNEL
A
350 WATTS/CH. @ 4 OHMS, STEREO
500 WATTS/CH. @ 2 OHMS, STEREO
2 OHM MINIMUM LOAD
1000 WATTS @ 4 OHMS, MONO BRIDGE
4 OHM MINIMUM LOAD
MONO
BRIDGE
+–
*MONO BRIDGE: 1+ HOT, 2+ RETURN
BIAMP: 1+ LOW HOT, 1– LOW RETURN
2+ HIGH HOT, 2– HIGH RETURN
23 24 25
33
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. Plug the male end of the cord
into a grounded AC outlet. DO NOT DEFEAT THE GROUND
PRONG OF THE AC PLUG!
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, using the five-way binding posts
(domestic units) or Speakon
®
jacks (export units) is recommend-
ed. The binding posts/Speakon
®
jacks must be used when oper-
ating in the Mono Bridged mode. (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