B3/B328/B3158 Bass Amplifier
The Front Panel Controls and Their Use
INPUTGAINDRIVEBASSULTRA MIDTREBLEON+12dBEQ40Hz80Hz150Hz 300Hz 600Hz 900Hz2kHz5kHz8kHzMASTERBALANCE
FLAT
0
-15dBPADPEAKLIMITON
-12dBPULLLOHI
EQ ONLOWHIGH
12 345678910111213 1415
1. INPUT:The signal output from an instru-ed clockwise, signal level is increased to10. GRAPHIC EQ:These sliders control the
ment (active or passive) or a line level signaldrive the preamp harder (into distortion). output frequencies indicated above each con-The
may be connected here by means of a shield-tone of the signal is also changed to providetrol. The center position of each control is flat
ed instrument cable.a smoother overdrive. (The tone controls may(no boost or cut).
have to be readjusted to obtain the overall
2. -15dB PAD:This switch, when depressed,11. MASTER:Set the overall output level of
attenuates the input signal by 15dB.desired tone.) The Gain control (#4) and -the amplifier with this control. Pulling this
Attenuation allows the Gain control (#4) to be15dB Pad (#2) interact with the Drive control.knob out actives the Graphic EQ (#10). When
For greater overdrive, the Pad switch should
used in a more usable (higher) position. Ifa footswitch is connected (#24, rear panel)
be out and the Drive control fully clockwise.
clipping is indicated with the Gain control at athis switch is disabled.
low setting, attenuation is needed.Use the Gain control to set the amount of
12. BALANCE (B3158 only):This control
overdrive desired. The Peak LED (#3) will illu-
3. PEAK LED: This LED flashes when theproportions the output signal between the low
minate steadily when the amp is used in this
signal level into the preamp approaches clip-and high frequency output jacks (see #18,
manner.
ping. Adjust the Gain control (#4) until arear panel) when using the amp in the biamp
6. BASS:This is the primary low frequency
strong signal from your instrument causesmode.
this LED to flicker.control which allows for 12dB of cut or boost
13. LIMIT LED(S):The LED illuminates
at 50Hz.
NOTE: If the LED flashes frequently with thewhenever the amplifier is near full output,
Gain at a low setting, use the -15dB pad (#2)7. ULTRA MID:This is the primary midrangeindicating that the internal limiter is keeping
to attenuate the input signal and readjust thecontrol. Rotate this control to the left of centerthe output from distorting.
for a Ocontoured� sound (more distant, less
Gain.NOTE: There are two Limit LEDs only on the
midrange output) or to the right of center for a
4. GAIN:This serves as the input level con-B3158: one for its low frequency power amp
pronounced (more up-front) tone.
trol for the amplifier. For the best signal toand one for its high frequency power amp.
noise ratio set this control so the Peak LED8. TREBLE:This is the primary high frequen-14. POWER ON LED: This LED indicator illu-
(#3) flashes when you strike a string fairlycy control which allows for 22dB of cut orminates when the POWER switch (#15) is ON.
17dB of boost at 5kHz.
hard.
15. POWER SWITCH:This heavy-duty rock-
5. DRIVE:This control is used to overdrive9. EQ ON LED: This LED illuminates when
er switch applies the power to the amplifier.
the EQ is turned on by either the Master
the preamp in order to get various harmonicThe amp is ON when the top of the switch is
Control (#11) or a footswitch (#24, rear
enhancement or distorted sounds. In the fullydepressed, OFF when the bottom of the
counterclockwise position the preamp is inpanel).switch is depressed.
the cleanest condition. As the control is rotat-
1. ENTRADA: Conecte aqu? su guitarra de bajosNOTA: Si el LED permanece iluminado a�n con lamentar? para impulsar el preamplificador con
usando un cable blindado para instrumentos.Ganancia en una posici?n baja, utilice la mayor fuerza (hacia la distorsi?n). El tono de laTerminal
2. TERMINAL DE -15dB:Si su bajo tiene captade -15dB (#2) para atenuar la se-al de entrada y-se-al tambiŽn cambia para proveer un sobreimpul-
dores de alta salida ? circuitos electr?nicos activos,reajuste la Ganancia.so m?s suave. Tal vez tengan que ajustarse los
usted tal vez notar? que el d?odo (LED) de Picos4. GANANCIA: Esto sirve como el control decontroles de tono para obtener el tono general
deseado. El control de Ganancia (#4) y la Terminal
(#3) parpadea ? permanece iluminado a�n en posi-nivel de entrada para el amplificador. Para lograr la
de -15dB (#2) interaccionan con el control de
ciones bajas del control de Ganancia (#4). Conectemejor relaci?n de se-al-a-ruido fije este control para
Impulso. Para un sobreimpulso mayor, el interruptor
esta Terminal para conservar limpia la se-al. Estoque el LED de Picos (#3) parpadee cuando usted
de la Terminal debe estar apagado y el control de
atenuar? la se-al de entrada hacia el preamplifipulse con fuerza alguna cuerda.-
cador, lo que le permitir? obtener la mejor relaci?n5. IMPULSO: Este control se usa para sobreim-Impulso totalmente a favor de las manecillas del
de se-al-a-ruido para su bajo.reloj. Use el control de Ganancia para fijar la canti-
pulsar el preamplificador a fin de conseguir varios
dad deseada de sobreimpulso. El d?odo LED de
3. DIODO (LED) DE PICOS:Este LED se ilumirealces arm?nicos ? sonidos de distorsi?n. En la-
Picos (#3) se iluminar? en forma constante cuando
nar? cuando cualquier etapa de preamplificaci?n seposici?n totalmente contraria a las manecillas del
el amplificadora se utilice de esta manera.
encuentre cerca del punto de sobreimpulso. reloj, el preamplificador se encontrar? en la posici?nAjuste
el control de Ganancia (#4) hasta que una se-alm?s Olimpia�. Conforme el control se gire a favor de6. BAJOS: Esta perilla sirve como el control pri-
fuerte de su bajo cause un parpadeo de este LED.las mane-cillas del reloj, el nivel de la se-al se incremordial para las frecuencias bajas. Esto permite un-
rango de 8dB de recorte ? de refuerzo a 50Hz.
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