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 B800 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 the standard 16 GA 1/4” cables will work OK with your
system, the CARVIN SP5 12 GA Speakon™ cables will allow you to drive as much
as 20% more power at high power levels extracting every watt from your B800
bass amp.
REAR PANEL CONTROLS
12
13
16
14
15
SPEAKER COMBINATIONS and OHMS ( Ω ):
Four x 8Ω cabinets = 2Ω (OK)
Three x 8Ω = 2.66Ω (OK)
Two x 8Ω = 4Ω (OK)
Two x 4Ω = 2Ω (OK)
One 8Ω and One 4Ω cabinet = 2.66Ω (OK)
Two 8Ω and One 4Ω = 2Ω (OK)
One 2.66Ω and One 8Ω = 2Ω (OK)
Two x 2Ω = 1Ω (not recommended)
Three x 4Ω = 1.33Ω (not recommended)
Two x 4Ω and One 8Ω = 1.6Ω (not recommended)
One 2.66Ω and One 4Ω = 1.6Ω (not recommended)
The B800 is a very powerful amplifier. As with any ampli-
fier, 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.
BRX212/BRX112NEO
12
20
17
19
18
13
20
19
16
15
14
17
B800 HEAD
12. COOLING VENTS
The rear vents are for cooling the internal power amps. Provide a minimum of 3” of clearance
for adequate ventilation. Blocking the air flow to these vents will cause the amp to thermally
protect and turn the speaker relays off. If this happens, clear the obstruction first, keep the
power on, and turn the guitar 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 EFFECT LOOP - SEND and RETURN jacks are used to connect external effects into the
B800 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 B800 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 unaffected
by the MUTE function so that you may tune your bass quietly.
17. SPEAKER OUTPUTS
The B800 amp contains 1/4” and 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. On the BRX212 and BRX112
combo's the 4 pined Speakon is wired: 1+,1- for the full range 800W amp and 2+,2- for the
50W high frequency amp. The extra speakon on the cabinet can be used for extension
speakers (minimum of 4 ohms) with the combo's internal speaker.
18. HF AMP OUTPUT LEVEL
The BRX212 features a separate amplifier for the internal high frequency horn. This volume
controls the output level for the high frequency amp.
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, the proper replacement fuses for 120 VAC
models are; 15 AMP 250VAC slow blow.
240 VAC models; 10 AMP 250 VAC slow blow.
20. AC LINE CORD
All B800 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 as it is there for your protection. If you must plug into a two prong outlet, use
a quality 3 to 2 prong grounded adapter and properly ground it.
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