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The Rear Panel:
5
15. CIRCUIT BREAKER: The B500DR employs an AC line cir-
cuit breaker to help protect against damage due to excessive
current demands. If the amplifier stops working, check the circuit
breaker. If it has opened, the button will be protruding and show-
ing a contrasting color. You can reset the circuit breaker by push-
ing 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 per-
son.
16. 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 elec-
tric codes and compatible with voltage, power, and frequency
requirements stated on the rear panel. Do no attempt to defeat
the safety ground connection.
17. SPEAKER OUTPUTS: The 1/4” jacks offer a convenient
method of connecting to speaker cabinets using cables terminat-
ed with 1/4” plugs. However, when using the amplifier at or near
its full output power, using the Speakon
®
jack is recommended.
18. FOOTSWITCH: Use this jack to connect the Ampeg AFP4BD
four button footswitch to the amplifier for remote selection of the
four presets.
19. BALANCED LINE OUT: Use this jack to send a pre-Master,
line level signal to a house mixing board, recording console or
external amplifier(s). Pin 2 = positive (+), pin 3 = negative (-).
20. LEVEL: Use this control to adjust the level of the signal at the
Balanced Line Out jack (#19).
21. POWER AMP INPUT: Use this jack to connect the output of
an external preamp directly into the power amp circuitry of the
B500DR by means of a shielded signal cable. The preamp sig-
nal is disengaged when this jack is used.
22. PREAMP OUTPUT: Use this jack to send a preamp signal to
an external power amplifier, mixing board, external effects, etc.
by means of a shielded instrument cable. Using this output does
not break the connection to the internal power amplifier.
23. PRE/POST: This switch, when depressed, sends a post-EQ
preamp signal to the Balanced Line Out jack (#19). The signal at
the balanced Line Out jack (#19) is pre-EQ when this switch is in
the out position.
24. EFFECTS LOOP RETURN: Use this jack to connect the
B500DR to the output of an external effects device by means of
a shielded signal cable.
27. EFFECTS LOOP SEND: Use this jack to connect the
B500DR to the input of an external effects device by means of a
shielded signal cable.
#98689
This device complies with part 15 of the FCC Rules. Operation is subject
to the following two conditions: (1) This device may not cause harmful
interference, and (2) This device must accept any interference received,
including interference that may cause undesired operation.
7 43565 15531 9
B500DR
(21) SERIAL# BMCDN20083
Line: 120V Freq: 60 Pwr: XXVA
1615 17 18 21 22 24 2519 20 23
B500DR Programmable Bass Amplifier