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REAR PANEL CONTROLS
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11. TUBE BYPASS SWITCH
The B1000 features a 12AX7 preamp tube which can be bypassed for
players who prefer a pure solid-state signal path. Press this switch IN
to bypass the tube.
12. EFFECTS LOOP
The SEND jack is the output of the preamp and is designed to deliver the
proper level for the input of an external effects processor. The SEND signal
source is after the TONE controls. The RETURN jack is designed to
receive signals from the output of an external effects processor. When a
signal is plugged into the RETURN, it breaks the connection between the
preamp and the internal power amp. The RETURN signal goes through
the VOLUME control to the power amp.
13. PHONES/TUNER JACK (UNMUTED)
The PHONES/TUNER jack is a stereo 1/4" jack designed for connecting
a tuner or headphones. This output is unaffected by the MUTE function
so you may tune your bass quietly while using the MUTE. This jack will
also send the mono signal to each side of your headphones. To listen to
headphones without hearing other speakers, turn down the VOLUME. The
EFFECTS LOOP will not be heard in the headphones. Volume is adjusted
by the DRIVE control.
14. DIRECT OUTPUT XLR JACK (MUTED)
The DIRECT OUTPUT XLR jack provides a balanced independent output
for going direct to the main PA or to a recording input. The output level
is adjusted from the front panel DIRECT OUT control. The source is
determined by the front PRE/POST switch. This output is controlled by
the MUTE function so you may tune your bass quietly while using the
MUTE. The DIRECT OUT signal is not affected by the VOLUME. The XLR
is protected against Phantom power (DC voltage) on cables coming from
phantom powered mixer inputs.
15. DIRECT OUTPUT GROUND LIFT SWITCH
If a hum occurs when connecting the DIRECT OUTPUT XLR to a mixer,
try using the GND LIFT switch. The GND LIFT switch IN lifts the ground
pin 1 of the XLR to 100 ohms above the chassis ground.
16. FOOTSWITCH JACK
The optional FS22 footswitch can be used to remotely control the MUTE
and EFFECT LOOP features. The tip contact controls the MUTE and the ring
contact controls the EFFECT LOOP. Any standard footswitch with a stereo
(TRS) plug will work.
17. SPEAKER OUTPUTS (SEE 2 OHM SWITCH and IMPEDANCE CHART)
The B1000 uses one Twist-Lock and one standard 1/4" speaker output
connector. These jacks are connected in parallel. The Twist-Lock connector
is recommended due to its high current handling and secure connection.
Either or both jacks can be used so long as the total impedance does not
go below 4 ohms or below 2 ohms with the 2 OHM switch pressed "IN".
B1000
8 OHM 325 WATTS
4 OHM 600 WATTS
2 OHM 900 WATTS
SET SWITCH FOR 2 OHM LOAD
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16
15
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If you go below the minimum speaker load, the amp may shut off or the
red PROTECT LED may light. To reset the amp, turn off the POWER switch
and connect the recommended load or set the 2 OHM switch.
18. 2 OHM SWITCH (SEE IMPEDANCE CHART)
This switch allows the B1000 to operate with speaker loads down to 2
OHMS. Set this switch to the IN position if the total impedance of all
speakers connected is less than 4 OHMS.
If you go below the minimum load, the power supply may shut off and the
large blue jewel light may go out or the PROTECT LED may light. To reset
the amp turn off the POWER switch for about 10 seconds, check speaker
connections and/or set the 2 OHM switch.
19. FAN INTAKE VENTS
The B1000 features a variable speed fan, which runs silent at low speeds.
Make sure the fan intake vents are free from blockage at all times.
20. AC POWER JACK & FUSE
The AC POWER JACK will accept 90VAC to 250VAC, 60Hz or 50Hz.
A detachable locking power cord is supplied (for European 230V use
a CEE-7 plug cord set). Plug the cord into a grounded 3 prong power
source. No attempt should ever be made to use the amp without the
ground connected.
The FUSE is located internally near the AC input. To check or replace,
first remove the power cord and then the enclosure lid. The fuse type is
a 250V Slow Blow rated at 5A.
A locking AC cord (Carvin part# 120V18L7, 120V model) is supplied
with the amp. However, a standard AC cord can be used.
To detach the cord from the amp, press the release lever on the underside
of the cord near the amp.
LOCKING AC CORD
120V18L7
IMPEDANCE CHART
SPEAKER COMBINATIONS/OHMS:
Two 16 ohm speakers
Two 8 ohm speakers
Three 8 ohm speakers
Four 8 ohm speakers
Two 4 ohm speakers
One 4 & one 8 ohm speaker
Two 2 ohms speakers
Three 4 ohms speakers
Two 4 & one 8ohm speakers
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PRESS TO
RELEASE
= 8 ohms
(OK)
= 4 ohms
(OK)
= 2.66 ohms
(OK) ( use 2 OHM setting )
= 2 ohms
(OK) ( use 2 OHM setting)
= 2 ohms
(OK) ( use 2 OHM setting )
= 2.66 ohms
(OK) ( use 2 OHM setting )
= 1 ohm
(no)
= 1.33 ohms
(no)
= 1.6 ohms
(no)
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