14. PROTECT LED
The PROTECT LED indicates one of the protection circuits has activated and
no sound will be heard from the amp. To reset the amp, turn the power off for
about 10 seconds, then turn it back ON. If the PROTECT LED stays lit for more
than 5 seconds check your SPEAKER OUTPUT connections, the 2 OHM switch,
or a blocked fan intake.
15. TUBE BYPASS SWITCH
The BX700 features a 12AX7 preamp tube that can be bypassed for players who
prefer a pure solid-state signal path. Press this switch IN to bypass the tube.
16. 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 and COMPRESSOR. 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 GRAPHIC EQ (if
active) and MASTER control to the power amp.
17. 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 MASTER. The EFFECTS LOOP and GRAPHIC EQ will not
be heard in the headphones. Volume is adjusted by the DRIVE control.
18. DIRECT OUTPUT XLR JACK (MUTED)
The DIRECT OUT 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 DI LEVEL 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
MASTER level, TONE controls, 9-band EQ or effects loop. The XLR is protected
against Phantom power (DC voltage) on cables coming from phantom powered
mixer inputs.
19. DIRECT OUTPUT GROUND LIFT SWTICH
If a hum occurs when connecting the XLR to a mixer, try using the GND LIFT
switch. The GND LIFT switch lifts the ground pin 1 of the XLR to 100 ohms above
the chassis ground.
20. FOOTSWITCH JACK
The optional FS22
footswitch can be used to remotely control the MUTE and graphic
EQ features. The tip contact controls the MUTE and the ring contact controls the
EQ. Any standard footswitch with a stereo (TRS) plug will work.
21. SPEAKER OUTPUTS (SEE IMPEDANCE CHART and 2 OHM SWITCH)
The BX700 uses one SPEAKON®
and one standard 1/4” speaker output connector.
These jacks are connected in parallel. The SPEAKON® connection is recommended.
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”.
If you go below the minimum speaker load, the amp may shut off or the PROTECT
LED may light. To reset the amp, turn off the POWER switch and connect the recom
-
mended load or set the 2 OHM switch.
22. 2 OHM SWITCH (SEE IMPEDANCE CHART)
This switch allows the BX700 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.
23. FAN INTAKE VENTS
The BX700 features a variable speed fan, which runs silent at low speeds. Make
sure the fan intake vents are free from blockage at all times.
24. AC POWER JACK & FUSE
The AC POWER JACK will accept 90VAC to 250VAC, 60Hz or 50Hz. A detachable
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) 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.
IMPEDANCE CHART
SPEAKER COMBINATIONS/OHMS:
Two 16 ohm speakers
= 8 ohms
(OK)
Two 8 ohm speakers
= 4 ohms
(OK)
Three 8 ohm speakers
= 2.66 ohms
(OK) ( use
2 OHM
setting )
Four 8 ohm speakers
= 2 ohms
(OK) ( use
2 OHM
setting)
Two 4 ohm speakers
= 2 ohms
(OK) ( use
2 OHM
setting )
One 4 & one 8 ohm speaker
= 2.66 ohms
(OK) ( use
2 OHM
setting )
Two 2 ohms speakers
= 1 ohm
(
no
)
Three 4 ohms speakers
= 1.33 ohms
(
no
)
Two 4 & one 8ohm speakers
= 1.6 ohms
(
no
)
REAR PANEL CONTROLS
20
21
23
24
22
19
18
17
15
16
