Page 1
12. EFFECT LOOP SEND/RETURN JACKSThe
EFFFECT LOOP
- SEND
and
RETURN
jacks are used to connect external effects into the
signal chain. The loop is inserted after the DRIVE and TONE CONTROLS but before the VOLUME
control. To use the effects loop, connect the SEND
jack to the input of the effects unit and con-
nect the
RETURN
jack to the output of the effects unit. The effects loop can be turned on with
the
EFFECT LOOP
switch on the front panel or by using the optional
FS22
footswitch. When
the front panel switch is in the UP position, the loop is engaged regardless of the footswitch.
The status of the effects loop is indicated on the front panel by the BLUE LED on next to the
EFFECT LOOP
switch.
13. DIRECT OUT XLRThe
DIRECT OUT
XLR is a balanced output that can be configured in a number of different
ways. The
PRE / POST
switch is used to select a pre or post preamp feed. In the
PRE
(OUT)
position, a direct feed is taken off of the
INPUT
jack and is similar to using a direct input box
at the bass guitar output. In the
POST
(IN) position, the feed is post the preamp section and
contains all of the signal that is sent to the power amp and speakers. To set the output, use the
DIRECT OUT LEVEL
control. A
GND/LIFT
switch is also available for the
DIRECT OUT
XLR jack.
Set this switch for the lowest noise when using this output. When the
GND/LIFT
switch is
depressed, the signal ground is lifted from this jack thus eliminating any ground loops between
the direct out and the gear it is feeding.
14. FOOTSWITCHConnect the optional
FS22
footswitch to remotely control the MUTE function and the EFFECTS
LOOP bypass. The first button on the
FS22
turns the MUTE on and off and the second button
turns the EFFECTS LOOP on and off. Any standard footswitch with a stereo plug will work.
15. TUNER LINE OUT JACK (UNMUTED)The
TUNER LINE OUT
jack is provided as a place to hook up a tuner. This output is unaffected
by the MUTE function so that you may tune your bass quietly.
16. SPEAKER OUTPUTSThe
B2000
contains two
1/4
/SPEAKON
®combo speaker output connectors. Multiple speak-
ers can be attached to either the 1/4 or SPEAKON
®jacks so long as the total impedance is not
below 2Ω. See SPEAKER COMBINATIONS AND OHMS chart.
17. TUBE BYPASSThe preamp 12AX7 Tube can be routed in or out of the preamp circuit using the bypass switch.
Set the switch IN to send your bass signal through the tube. Set the switch in the OUT posi-
tion to bypass the tube.
FOR MAXIMUM OUTPUT:A. To get more output, use multiple speakers or enclosures. Every time you double your
speakers, your acoustic output goes up by a factor of four. Load the amplifier down to
its lowest minimum impedance for maximum RMS power.
B. To get the highest output from your
B2000
bass amp use two 4 ohm speakers. Plug
two SPEAKON
®cables into the rear SPEAKER OUTPUT connectors or daisy-chain another
SPEAKON
®from speaker to speaker. Two 4 ohm speakers will give you a total imped-
ance of 2 ohms, which is the maximum power from your amp. If you use more than
two 4 ohm speakers, your amp will shut off and go into the protect mode. To reset,
turn your amp off and connect only two 4 ohm speakers.
C. SPEAKON ®cables are recommended for your bass rig because of their high current
capacity. While standard 1/4 speaker cables will work, the CARVIN 12 GA SPEAKON
®
cables will allow higher currents to pass through the cable to extract every watt from
your amp.
HELPFUL HINTS
1) NO SOUND FROM AMP: The MUTE function has been inadvertently engaged, speakers
have been improperly connected or Effect Loop has been improperly connected.
2) NO HIGH FREQUENCIES: Tweeters or midrange drivers have been damaged from too
much power.
3) WEAK BASS: The speaker systems are wired out of phase to each other. To correct,
reverse the wires on one of the speaker connectors.
4) DIR XLR HUM: Try switching the rear GND LIFT switch IN or OUT. Check for noise from
external effects or bad cabling.
5) PROTECT MODE: The RED PROTECT LED provides the operator with information about the
status of the amplifier. The PROTECT LED can come on under 3 different conditions (when
this happens, speaker relays disconnect the speakers);
1) During power-up, the amplifier stays in a muted state for approx. 3 sec until it determines
that everything is functioning normally (no output shorts or over temp conditions).
2) The RED PROTECT LED will illuminate when the output load draws excessive current or a
direct short is detected caused by a shorted speaker cable or speaker system. Reset this con-
dition by turning the amp off for two seconds and then on again. Check for shorted cables
and that the total speaker impedance is not below 2 ohms.
3) Overheating is usually determined when the amp stops in the middle of a performance and
the RED PROTECT LED comes on. If this is the cause, leave the amp on for the fan to cool
the amp down. The amp will automatically reset within 3 minutes. The PROTECT LED will
turn off when ready. Check for the following conditions; a) The rear intake air is not restricted,
b) The intake air is not extremely warm, c) The front exhaust vents are not restricted, or d) No
excessive speaker load (try other speakers or remove speakers if you have more than one con-
nected to each channel).
Power supply protections are not indicated by the protection LED, but by the power turning
off completely. If the protected state is a thermal power supply issue or an over current power
supply issue, the power supply with reset it self and go through the same turn on cycle as
when first turned on.
1. INPUT JACKThe 1/4
INPUT
jack accommodates both passive and active instruments. The high imped-
ance
Class A
input stage offers enough headroom to perform without clipping even when used
with high output active basses. Input gain is adjusted with the
DRIVE
control (
6) and the
ACTIVE
INPUT
switch (
5).
2. VOLUME CONTROLThe
VOLUME
control adjusts the output level to the speakers. Adjusting the
DRIVE
control
will also change your output level.
3. MUTE SWITCH/LEDThe
MUTE
switch will stop all output signals with the exception of the
TUNER
and
EFFECT
SEND
signals. The
MUTE
function can also be remotely controlled from the rear
FOOTSWITCH
jack using the optional
FS22
footswitch. The blue LED next to the
MUTE
switch will light when-
ever the amp is muted. The footswitch will have no effect if the front panel MUTE
switch is on
in the UP position.
4. CLIP LEDThe red
CLIP
LED indicates that the input is near clipping. Since the preamp is designed with
several
Class A
input gain stages and the ability to be overdriven, the
CLIP
LED monitors only
the first input stage and will not indicate when the
DRIVE
control is set to overdrive the preamp.
To avoid input clipping, reduce the bass level or reduce the output level of devices placed between
the bass and the input jack.
5. ACTIVE INPUT SWITCH / LEDThe
ACTIVE INPUT
switch is used to match the input gain of the amp to instruments that
contain active electronics. If the preamp is being prematurely overdriven, flip the
ACTIVE INPUT
switch to the ON position. If the output of your bass is low and you are not getting enough
volume from the speakers, be sure the
ACTIVE INPUT
switch is OFF and increase the
DRIVE
control. The blue LED indicates that the ACTIVE INPUT mode is ON. 6. DRIVE CONTROLThe
DRIVE
control adjusts the input gain to the preamp and the level of harmonics in the
signal. With the
DRIVE
control set low, both input gain and harmonics are at a minimum for
clean output. Increasing the
DRIVE
control causes the Class A gain stages to introduce more
harmonics resulting in a rich sound typical of vintage tube amps. With the
DRIVE
control set
near maximum, overdrive sounds can be produced. The
DRIVE
control can be used with the
ACTIVE INPUT
switch to get the sound you want. To reduce preamp overdrive while retaining
the harmonics of a high
DRIVE
level setting, turn the
ACTIVE INPUT
switch ON or reduce the
level on the bass guitar. Turning the
ACTIVE INPUT
switch OFF will make the preamp over-
drive easier.
7. TONE CONTROLSThe six TONE CONTROLS are designed with the center frequencies most requested by pro-
fessional bass players. To start, set each control at its center flat position (no tones are cut or
boosted). Raise or reduce each control to get your desired tone.
Center Frequencies
SUB BASS
40Hz
BASS
100Hz
LO MID
400Hz
MID
800Hz
HI MID
2kHz
TREBLE
6kHz
8. EFFECT LOOP SWITCH/LEDThe
EFFECT LOOP
switch engages the rear effects loop connections. The effects loop can be
turned on with the EFFECT LOOP
switch on the front panel or by using the optional
FS22
footswitch. When the front panel switch is in the UP position, the loop is engaged regardless
of the footswitch. The status of the effects loop is indicated on the front panel by the BLUE
LED next to the
EFFECT LOOP
switch.
See EFFECT LOOP SEND/RETURN JACKS #12.
9. AMP CLIP LEDThe
AMP CLIP
LED indicates that the power amp is being driven too hard
. Reduce the
volume level.
10. PROTECT LEDThe
PROTECT
LED indicates that the power amp has gone into one of its protect modes.
11. POWER SWITCH/(PROTECT RESET)Push the upper portion of the POWER SWITCH to turn the amplifier on. If the large blue power
indicator is on but no sound is coming out of the speakers, the amp may have gone into one
of its protection modes. To reset the amp, turn the power off for 30 seconds and then turn the
amp back on. If the problem persists, check for; a) The speaker impedance is too low for the
amp, b) bad speaker cable, c) damaged speaker or, d) blocked rear fan intake.
1
FRONT PANEL CONTROLS
REAR PANEL CONTROLS
2
3
4
5
6
7
8
9
SPEAKER COMBINATIONS and OHMS (
Ω):
Four x 8Ωcabinets = 2Ω(OK)
Three x 8Ω= 2.66Ω(OK)
Two x 8Ω= 4Ω(OK)
Two x 4Ω= 2Ω(OK)
One 8Ωand One 4Ωcabinet = 2.66Ω(OK)
Two 8Ωand One 4Ω= 2Ω(OK)
One 2.66Ωand One 8Ω= 2Ω(OK)
Two x 2Ω= 1Ω(no)
Three x 4Ω= 1.33Ω(no)
Two x 4Ωand One 8Ω= 1.6Ω(no)
The
B2000
is a powerful amplifier. As with any amplifier, make sure your speakers
are suitable for the available wattage. Driving speakers with too much wattage will cause
them to distort and eventually fail. If distorted sound is coming from the speakers, reduce
the volume until the distortion stops.
10
11
16
13
12
14 15
12
