Hughes & Kettner Bass Base 400 User Manual
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MANUAL
BASS TECHNOLOGY
BASSBASE
400 - MANUAL
1 .O CONNECTIONS AND CONTROL FEATURES
SIGNAL LED:
Indicates the presence of an
instrument signal at the tube stage.
-10 db SWITCH: Lowers the
BASSBASE'S
input
impedance (e.g. for active instruments).
DIRECT: Press this button to send the original
instrument signal (unaffected by gain settings,
voicing controls, FX loop and notch filter)
directly to the DI OUT jack, at MIC level.
GROUND LIFT: Removes
the ground from the chassis
at the DI OUT jack.
I
,/’
,_‘.
,/,’
GRND DIR
00
-10
dB
0
CLIP LED: Indicates all types of clipping in the
BASSBASE’s
preamp (including post-EQ section and
FX loop distortion). In other words, an illuminated
CLIP LED does not necessarily mean the GAIN
control is set too high, it may also indicate the FX
signal level is not adjusted properly.
TUBE SATURATION LED: Indicates the
preamp is in tube overdrive mode.
MUTE: Switches all of the
BASSBASE
400’s outputs
except for the TUNER OUT off. Use this button for
breaks between sets, switching instruments, or
when tuning. The RED MUTE LED will illuminate
to indicate the amp is muted.
DI OUT: Use this jack to send signals to a
mixing console or additional power amp.
INPUT
-
Connect your bass to this jack.
CAIN: Controls the input sensitivity and drive
level of the
BASSBASE
preamp.
BASS: This EQ control defines the bottom end. At the 12 o’clock
position, the signal remains completely unaffected.
0
10
-5
-5
+5 -15 +15
FREQ
HZ
LEVEL
dB
t
TREBLE: Use this control to adjust the high end,
particularly the sizzle and overtone range.
FREQ HZ: Defines
the center frequency
for the
VARIMETRIC -
EQ's
LOW RANGE
section. Please refer
to Section 3.2!
LEVEL: This control adjusts
the level of the frequency
you selected via the FREQ
HZ control. Turn
clockwise to increase,
counter-clockwise to
decrease.
BASSBASE
400 - MANUAL
Red VARIMETRIC LED:
Illuminates to indicate
the VARIMETRIC EQ is
active.
FX LOOP ON: Press this button
to activate the E
parallel
FX
loop
BASSBASE 400’s
DYNACLIP LED:
Illuminates when the DYNACLIP power
amp circuit is active. DYNACLIP eliminates undesirable
power amp distortion and provides
20% additional
headroom in comparison with conventional power amps.
,
VARIMETRIC ON:
Green FX LED:
Activates the
Indicates the FX
VARIMETRIC EQ.
loop is active.
NOTCH FILTER: This
adjustable, extremely
narrow-band filter is not
used for normal
soundshaping, but to suppress
specific stage and room
resonances (e.g. a stage
floor’s sympathetic
vibrations).
PROTECT LED: Illuminates when one of the power
amp circuit breakers has tripped. Inadequate
ventilation, a short circuit in the SPEAKER OUTS or
direct current in the output will trigger the circuit
breaker.
TEMP LED: Indicates that thermal overload
(overheating) is the reason why the protective
circuit has activated (e.g. when the ribbed
ventilation duct is obstructed).
FREQ
KHZ
LEVEL
dB
FREQ
HZ
CUT
dB
FREQ: Use this control
to adjust the notch
filter’s center frequency
within a range of 30 to
500 Hz.
s
control adjusts the
LEVEL: T
level of the center frequency you
selected via the FREQ KHZ control.
MAINS
PHONES
-
MAINS: AC
power switch.
MASTER: Controls
I
the
BASSBASE
400’s PHONES: Plug headphones
overall output.
with an impedance rating
within the 4-600 ohm range
into this jack.
FX-
MIX : The FX MIX pot adjusts the
balance between the original signal and
the processed signal. DRY = original
signal only, WET = processed signal only.
FREQ KHZ: Defines the center
frequency for the
EQ's
HI
RANGE section.
CUT: Turn this control up to suppress the
frequency you selected via the FREQ
control.
5
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