Filter
Top Products
5
The Rear Panel:
16 17 18 19 20 21 24 262522 23
16. AC LINE IN: Firmly insert the female
end of the supplied AC power cord into this
socket. The grounded power cord should
only be plugged into a grounded power
outlet that meets all applicable electrical
codes and is compatible with the voltage,
power, and frequency requirements stated
on the rear panel. Do not attempt to
defeat the safety ground connection.
17. CIRCUIT BREAKER: The circuit
breaker protects the unit from damage
caused by excessive current demands. If
the amplifier stops working, check the cir-
cuit breaker. If it has opened, the button will
protrude showing a contrasting color.
Reset the circuit breaker by depressing it
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 inspected by a qualified
service person.
18. SPEAKER OUTPUTS: Connect the
amplifier to your speaker cabinet(s) using
heavy gauge speaker cables terminated
with the appropriate connectors. The
Speakon
®
jack is recommended when play-
ing at full output levels.
ATTENTION: When connecting speaker
cabinets to the amplifier, the minimum
total impedance load must not be lower
than two ohms. The following chart shows
the total impedance load when connecting
multiple speaker cabinets in parallel:
19. LINE OUT: Use this 1/4” jack to send a
post-EQ line level signal to an external
amplifier, mixing console or recording
equipment.
20 EFFECTS RETURN: When using an
external effect, connect the effect’s output
into this jack by means of a shielded signal
cable.
21. EFFECTS SEND: When using an
external effect, connect this jack to the
effect’s input by means of a shielded signal
cable.
22. LEVEL: Use this control to adjust the
level of the signal at the Transformer bal-
anced Line Out jack (#23).
23. TRANSFORMER BAL. LINE OUT:
Use this XLR jack to send a line level sig-
nal to an external amplifier, mixing console
or recording equipment. The signal at this
jack may be pre or post-EQ, depending on
the setting of the Pre/Post switch (#25).
24 GND/LIFT: When this switch is
depressed the ground pin of the
Transformer Balanced Line Out jack (#24)
is interrupted. This may reduce residual
hum and buzz which is sometimes picked
up by line out signal cables. This switch
does not affect signal at the 1/4” Line Out
jack (#19).
25. PRE/POST: This switch determines
whether the signal at the Transformer
Balanced Line Out jack (#23) is pre-EQ
(switch out) or post-EQ (switch depressed).
26. FAN: The PB800 employs an internal
cooling fan to circulate air through the unit
to prevent thermal overload conditions. Do
not obstruct the rear or side panel air vents.
Allow substantial clearance at all vents for
proper air circulation at all times.
Cabinet # of Total
Impedance Cabs Impedance
4Ω 22Ω
8Ω 24Ω
8Ω 42Ω
16Ω 28Ω
16Ω 44Ω
Speakon
®
is a registered trademark of Neutrik USA
PB800
PortaBass Bass Amplifier Head