12. COOLING VENTS
The rear vents are for cooling the internal power amps. Provide a minimum 3” rear clear-
ance for adequate ventilation. Blocking the air flow to these vents will cause the amp to ther-
mally protect and turn the speaker relay off. If this happens, clear the obstruction first, keep
the power on and turn the volume down allowing the amp to cool. The amp will engage the
speaker relays when cooling conditions return to normal.
13. EFFECT LOOP SEND/RETURN JACKS
The EFFFECT LOOP - SEND and RETURN jacks are used to connect external effects into the
B500/B1500 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 connect 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 next to the EFFECT
LOOP switch.
14. DIRECT OUT XLR
The 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 B500/B1500 direct out and the gear it is feeding.
15. FOOTSWITCH
Connect 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.
16. TUNER LINE OUT JACK (UNMUTED)
The TUNER LINE OUT jack is provided as a place to hook up a tuner. This output is unaf-
fected by the MUTE function so that you may tune your bass quietly.
17. SPEAKER OUTPUTS
The B500/B1500 amp contains four 1/4” and two SPEAKON
®
speaker output connectors. Multiple
speakers 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.
19. INTERNAL FUSE
If there are high AC voltage surges or if the amp is used with excessive loads, the internal
fuse will protect your amp from damage. If the fuse fails, remove the cover and replace with
the proper replacement fuse. For 120 VAC models; B500-15 AMP and B1500-25 AMP 250VAC
slow blow.
240 VAC models; B500-10 AMP and B1500-15 AMP 250 VAC slow blow.
20. AC LINE CORD
All B500/B1500 Series bass amplifiers are supplied with detachable three conductor AC line
cords. Make sure the cord is securely inserted into the back of the unit. Never defeat the ground
of the AC line cord. If you must plug into a two prong outlet, use a quality 3 to 2 prong grounded
adapter and properly ground it.
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 B500/B1500 bass amp use two 4 ohm speak-
ers. 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 impedance 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 B500/B1500 bass amp.
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