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18. DIRECT OUTPUT XLR JACK (MUTED) The DIRECT OUT XLR jack provides a balanced independent output straight from the input jack (PRE)
for going direct to the main PA or recording input. The output level is adjusted from the front panel DI
LEVEL control.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 SWITCH 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 BX500 uses two combination 1/4 and
SPEAKON®
speaker output connectors. Standard 1/4 speaker
cables can be plugged directly into the center of the green SPEAKON® jacks
. 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 recommended load or set the 2 OHM switch.
22. 2 OHM SWITCH (SEE IMPEDANCE CHART)This switch allows the BX500 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.
If you are connecting a speaker with an impedance of 4 ohms to the
BR510N
or BR515N
combo, set the
2 OHM switch to the IN position.
23. FAN INTAKE VENTS The BX500 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 & FUSEThe AC POWER JACK will accept 90VAC to 250VAC, 60Hz or 50Hz. A detachable power cord is sup-
plied (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.
FRONT PANEL CONTROLS
REAR PANEL CONTROLS
20
21
1.
INPUT JACK
The 1/4" phone jack is a high impedance instrument input designed to handle both active and passive
basses in connection with the ACTIVE switch. 2. BLUE JEWEL LIGHT (POWER INDICATOR)The POWER switch turns on the amplifier and is indicated by the large blue jewel light over the input
jack. This light also indicates the condition of the power supply. If it the SPEAKER OUTPUT is shorted
or if it is loaded below its minimum rating, the power supply may shut off to protect the amp (see PRO-
TECT LED).
If the power indicator goes out while playing, reset the amp by turning the POWER switch OFF for
about 10 seconds. Check your speaker connections and the 2 OHM SWITCH setting (see 2 OHM SWITCH
on rear panel). Turn the POWER switch back ON. 3. MUTE SWITCH (FOOTSWITCHABLE)The MUTE switch turns off the output of the amplifier. A blue LED indicates the MUTE switch is on. The
MUTE switch is ideal for changing basses and silent tuning on-stage. The rear tuner output is never
muted. The mute feature can also be switched with the optional
FS22
footswitch.
4. ACTIVE SWITCHFlip the ACTIVE switch to the DOWN position for standard bass pickups. If your bass uses a battery
with an onboard active preamp, put the switch in the UP position. A blue LED indicates the ACTIVE switch
is on. 5. DI LEVEL (DIRECT OUT) The DI LEVEL controls the output level of the XLR DIRECT OUTPUT jack. The DI level is not affected
by the MASTER level, TONE controls, 9-band EQ or effects loop. 6. DRIVE CONTROL The DRIVE control adjusts the input level to the CLASS A preamps. The DRIVE control serves two pur-
poses. The DRIVE can be used to adjust the input sensitivity for the differences in bass pickups. The
DRIVE will also change the harmonic content of your sound. Turning the knob closer to 10 will create
a more overdriven tone. The DRIVE will also change the volume of the amplifier, use it in combination
with the MASTER control to achieve the desired volume. 7. CONTOUR CONTROLThe CONTOUR control provides a variable mid-range scoop. When this control is set to FLAT there
is no change to the mid-range frequencies. As you turn the contour control clockwise, the mid range is
scooped at the center frequency at 350Hz. When the CONTOUR control is set to maximum the mid-
range is cut by -15dB at 500Hz. 8. BASS AND TREBLE TONE CONTROLSThe BASS and TREBLE controls are custom shaped tone controls designed to deliver punchy lows and
crisp highs for a variety of bass sounds. When a control is turned to the right it boosts the signal and
when turned to the left cuts the signal. The affected frequencies for the BASS start at 80Hz and can deliver
a great deal of volume. Be careful not to distort the output or overpower your speakers. The affected
frequency for the TREBLE control begins at 5kHz. 9. SEMI-PARAMETRIC MID SWEEP TONE CONTROLS
(LO MID, HI MID & FREQ)
Start with the LO MID sweep. The FREQ control does not function if the GAIN control is set in the center
0 position. To demonstrate, turn the GAIN to the right for full boost. Now play your bass and turn the
FREQ control from left to right and notice the how the added mids change frequency. Now turn the GAIN
to the full left and turn the FREQ control again and notice the mids disappear at different frequencies.
Try this with the HI MID also. The mid sweep system controls can be very effective to fine tune your
overall sound.
10. COMPRESSOR The compressor reduces the volume of the incoming signal as it reaches a preset maximum level. As
the COMP knob is turned up (clockwise), the compressor reduces a percentage of peak signa. This per-
centage is called the compression ratio. When the knob is at the OFF position (full counter-clockwise)
the ratio is 1:1, where all of the input signal passes through the compressor without being affected. At
the MAX setting, the compression ratio is 3:1.
The advantage of a compressor is to the reduce peaks and other sudden loud parts (transients) of your
playing so you can increase your overall volume. For example, in slap bass playing the plucked notes
can put out peaks that would distort the amplifier at normal playing volumes. If the amps volume was
adjusted for these peaks, the rest of the notes would be too quiet to hear with the band. When the com-
pressor is adjusted to where the LED comes on for loud peaks, the amplifier can be played louder with-
out distortion. Its like having someone re-adjusting the volume of the amplifier to help prevent
distortion when the peaks occur. 11. 9-BAND GRAPHIC EQUALIZER AND EQ IN SWITCH
(FOOTSWITCHABLE)
The 9 band graphic EQ has been designed with center frequencies most requested by professional bass
players. This EQ can be used to fine tune the tonal content of the amps output. Since the graphic EQ is
switchable with either the optional FS22 footswitch or the EQ switch on the front panel, it can be used
during passages of a song when the bass needs to punch through the mix. Musicians that play more
than one bass on stage will also find this useful to get the sounds they desire out of each instrument.
The BLUE LED located above the GRAPHIC EQ IN switch signifies when the graphic EQ is working.
NOTE
:
When the front panel GRAPHIC EQ switch is off, it cannot be turned on with the footswitch
.
12. MASTER VOLUME Use the MASTER to control the overall volume of the amplifier. Reduce the MASTER if your sound becomes
overly distorted. Using the COMPRESSOR will also help prevent distortion or overloading of your speakers. 13. POWER SWITCH The POWER switch turns the amp ON or OFF. It is normal for the PROTECT LED to stay on for approx-
imately 2-4 seconds after the the POWER switch is turned on. 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 BX500 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 LOOPThe 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 COMPRES-
SOR. 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 inter-
nal power amp. The RETURN signal goes through the GRAPHIC EQ (if active) and MASTER controls 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.
1
3
4
9
10
11
23
24
2
6
9
7
12
HF DRIVER ATTENUATION CONTROL (BR510N & BR515N)On the back of the
BR510N
and
BR515N
speaker enclosures there is a jack plate with the HIGH FRE-
QUENCY ATTENUATION control for the HF Driver. This control will only affect the volume of the HF
Driver and does not affect the woofers.
The HIGH FREQUENCY ATTENUATION control is another way to increase or decrease the highs coming
from your amp. There are six settings ranging from 0 (full on) to OFF. If more highs are desired
turn the HF ATTENUATION control UP towards 0 (clockwise), or turn it DOWN towards OFF (counter-
clockwise) if a warmer sound is desired.
Note 1
: One thing to consider with the HF Driver volume is which direction the cabinet is facing.
Because the combo amplifiers HF Driver is less that two feet off the ground, the listeners seated in
front of the amplifier may be getting more of the HF Driver volume than you (the player) standing in
front of the amplifier. So be conscious of the volume and direction of the HF Driver when adjusting.
Note 2
: If you occasionally clip the power amp, the HF driver may make the clipping distortion more
noticable. Turning the HF LEVEL down a few clicks or OFF will reduce the unpleasant sound and will
further protect the HF driver from damage.
IMPEDANCE CHART SPEAKER COMBINA
TIONS/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 )
One 5.33 & one 8 ohm speaker = 3.2 ohms (OK) ( use
2 OHM
setting )
One 2.66 & one 8 ohm speaker = 2 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)
OFF -24 -12 -6 -3 0
LESS HIGHS MORE HIGHS
5
8
8
14
13
22
19
18
17
15
16
BX500 shown with optional
rackmount faceplate
