16. FAN: This temperature controlled, variable
speed fan draws cool air into the amplifier, which
forces heat out through the exhaust vents. Never
block the vent holes or the fan opening.
17. FUSE: This protects the unit from damage due
to overload conditions or power line surges. If the
fuse blows, replace it only with the same size and
type.
18. 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!
19. SPEAKER OUTPUTS: Use these jacks to con-
nect the amplifier to your speaker(s) using cables
terminated with 1/4” connectors.
NOTE: When connecting multiple speaker cabi-
nets to the amplifier, keep the overall impedance at
or above four ohms!
20. POWER AMPIN: This mono jack allows you to
feed the preamp output of another amplifier to the
input of the B2R’s internal power amp. T h i s
bypasses the preamp circuitry of the B2R.
WARNING: This jack goes directly into the power
amplifier. DO NOT connect high level signals to it!
21. PREAMPOUT: A post-EQ signal may be taken
from this jack and sent to the house mixing board,
recording console or external power amplifier.
22. EFFECTS R E T U R N : To use an external
effects device, connect the OUTPUTof the device
to this jack by means of a shielded cable. This
feeds the processed signal into the Master section
of the amplifier.
23. EFFECTS SEND: Connect the output from this
jack to the INPUT of your effects by means of a
shielded cable. This sends a post-EQ signal to
your effects.
24. -20dB SWITCH: This switch adjusts the output
level at the Balanced Line Output jack (26). The
control works independently from the front panel
Master control. Depressing the switch activates the
20dB pad. The result is a signal that is more com-
patible with the microphone inputs on a mixer.
25. PRE/POST SWITCH: You can select either Pre
or Post EQ for the signal at the Balanced Out jack
(26) with this switch. With the switch in the OUT
position, the signal at the jacks will be Pre-EQ.
This is a direct output not affected by any EQ or
boost settings. With the switch depressed, the sig-
nal is Post-EQ and is controlled and modified by
the tone controls, Graphic EQ, and Effects Loop.
26. BALANCED OUTPUT: This XLR-type connec-
tor supplies a balanced preamp output signal for
connecting to a house mixing board, recording
console or external amplifiers with balanced
inputs. The signal can be set to Pre or Post EQ by
the Pre/Post switch (25). The level can be adjust-
ed for either mic or line type inputs using the -20dB
switch (24).
B-2R rear panel:
Technical Specifications:
OUTPUT POWER RATING 350 watts RMS, 4 ohm load, 120VAC; 200 watts RMS, 8 ohm load, 120VAC
POWER REQUIREMENTS 120VAC, 60Hz, 200VA; 100VAC, 50/60Hz, 200VA; 230VAC, 50/60Hz, 200VA
TONE CONTROL RANGE
BASS: ±8dB @ 50Hz
ULTRA-MID: ±8dB @ 500Hz
TREBLE: +12dB/-19dB @ 5kHz
GRAPHIC EQ RANGE ±11dB @ 40Hz; ±8dB @ 80Hz, 150Hz, 300Hz, 600Hz, 900Hz, 2kHz; ±9dB @ 5kHz, ±12db @ 9kHz
GAIN 45dB typical, tones @ center
SIGNAL TO NOISE RATIO 75dB typical
SIZE AND WEIGHT 19” W x 3.5” H x 12.75” D, 15 lbs.
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