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BX-100 Bass Amplifier
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FRONT PANEL – INPUT SECTION
1: Input jack accepts a standard 1/4" phone plug and is suit-
able for any low to line level signal source.
2: -15dB/0dB Switch pads the input signal 15dB when
pressed in, allowing the use of hotter inputs such as tape
decks or active basses.
3: Gain sets the amount of gain for the preamp. A low output
instrument or soft playing style requires high gain (5-10 set-
ting) while a high output instrument or hard playing style
requires less gain (1-4 setting). Too high a setting along with
boosted equalization may cause distortion or a harshness of
sound. If this is not desired, simply reduce the gain with this
control.
4: Peak LED lights when the input signal is nearing clipping.
Set the gain control so this LED flashes occasionally when
you play.
5: Shape control sets the frequency where the contour effect
is centered, giving you a wide variety of tonal variations, from
a studio "V"-shaped tone to a more "live", more present sound.
This control is only active when the Contour Active switch (#6)
is pressed in.
6: Contour Active Switch activates the Contour Shape con-
trol when pressed in.
EQUALIZATION SECTION
7: Graphic Equalizer is the main tone control section of the
BX-100. Eight bands of frequencies from 50Hz to 16kHz may
be boosted by moving the sliders up or cut by moving the slid-
ers down. The lower frequencies are to the left and the higher
frequencies are to the right. A great many tone variations are
possible using different settings of these sliders.
8: Master Level control sets the overall listening level of the
BX-100.
9: Limit Indicator LED: The BX-100 contains a power amp
limiter which automatically limits the signal to the power amp
to a point just below "clipping" or distortion. This is to assure a
clean undistorted sound at full power. The limit LED indicator
will be lit whenever full power is reached.
10: Balanced Line Out Level control adjusts the strength of
the signal at the Balanced Line Output jack (#12).
11: Pre/Post EQ Switch determines whether the line out sig-
nal is taken before (switch in) or after (switch out) the BX-100's
Gain, Shape, and Equalizer controls.
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12: Balanced Line Out jack provides a balanced output sig-
nal for connection to an external power amp, tape deck or mix-
ing board.
EFFECTS LOOP
13: Send jack may be connected to the line level input of an
external effects device. This jack may also be used as a
"direct" unbalanced send for recording, etc.
14: Return jack may be connected to the line level output of
an external effects device. The "Post Gain" configuration is
helpful in obtaining optimum input signal levels to external
devices and reducing the noise levels associated with them.
15: Headphones jack will accept a standard headphone plug
for private practicing. The speaker is automatically discon-
nected when headphones are plugged in here.
16: Extension Speaker jack allows connection to an external
speaker cabinet. A speaker plugged into this jack will be in
series with the internal speaker.
WARNING: DO NOT attempt to use head-
phones in the Speaker jack! Permanent
hearing damage could result!
17: On Indicator LED will be lit when the amplifier is turned
on.
18: Power Switch turns the AC power on or off.
REAR PANEL
19: Power Cord: Your BX-100 is equipped with a heavy-duty
grounded three-wire power cord. Be sure this cord is properly
plugged into a safely wired grounded 120 VAC 60 Hz AC
power outlet before use. (If your BX-100 was purchased out-
side the United States, refer to the rear panel for power rat-
ings). For your safety, never attempt to defeat the ground con-
nection on this cord.
20: Fuse Holder: The BX-100 is protected from damages
caused from a faulty AC power source or other problems. If
the fuse blows, replace it ONLY with the same size and type
as indicated. If the fuse blows repeatedly, check the AC
source: if it's okay, contact your Crate dealer for service infor-
mation.
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