BASS AMPLIFIER
User’s Guide
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BASS AMPLIFIER
Congratulations!
You are now the proud owner of the compact but powerful Crate
BX25DLX/BX50DLX Bass Amplifier. The BX25DLX/BX50DLX features
two different channels: a distortion channel, featuring Crate’s exclusive
Shape control for quick and easy access to the tone you need, and a
clean channel with a four-band rotary EQ. Another unique and valuable
feature of this amplifier is the Octave control. This feature electronically
creates a second signal that is one octave lower than the original signal.
An active electronic tuner, conveniently located on top of the amplifier,
allows you to get in tune and stay in tune “on the fly.” Front panel jacks
are provided for connecting a CD player and a pair of headphones,
thereby optimizing your practice time.
Like all Crate products, your BX25DLX/BX50DLX is designed by
musicians and built using only the best components. Extensive testing
at the hands (and ears) of skilled technicians and musicians insures you
that this amplifier is the absolute best it can be.
In order to get the most out of your new bass amp, we urge you to
check out the information in this manual before you begin playing.
And thank you for choosing
Declaration Of Conformity
#28, Effective 01-01-2001
Manufacturer’s Name:
SLM Electronics
Production Facility:
Production Facility:
Shipping Facility:
Office Facility:
11880 Borman Drive, St. Louis, MO 63146, USA
700 Hwy 202 W, Yellville, AR 72687, USA
1400 Ferguson Ave., St. Louis, MO 63133, USA
1400 Ferguson Ave., St. Louis, MO 63133, USA
Product Type:
Audio Amplifier
Complies with Standards:
LVD:
92/31/EEC, 93/68/EEC, & 73/23/EWG
EN60065
EN55013, EN55020, EN55022, EN61000-3-2,
& EN61000-3-3
Safety:
EMC:
Supplementary information provided by your local Sales & Services Office or:
SLM Electronics - R & D Engineering
1901 Congressional Drive, St Louis, MO 63146, USA
Tel.: 314-569-0141, Fax: 314-569-0175
3
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BASS AMPLIFIER
The Front Panel:
1. INPUT: Use this 1/4” jack to connect your bass to the amplifier by means of a shielded instrument cable.
2. GAIN: Use this control to adjust the amount of distortion for the Distortion/A channel. As you rotate the con-
trol clockwise the amount of distortion increases.
3. SHAPE: Use this control to adjust the tone of the Distortion/A channel, from a studio “V”-shaped tone to a
more “live,” more present sound.
4. LEVEL: Use this control to adjust the output level of the Distortion/A channel.
5. CHANNEL SWITCH: Use this switch to select either channel. With the switch in the out position, the
Clean/B channel is selected. When the switch is depressed, the Distortion/A channel is selected. The adjacent
LED illuminates when the Distortion/A channel is selected. NOTE: When using the footswitch (#18): when this
switch is depressed, the footswitch switches between the Distortion/A channel and the Clean/B channel; when
this button is in the out position, the Clean/B channel is always active, and the footswitch turns the Distortion/A
channel on and off, allowing you a blend of both channels.
6. LEVEL: Use this control to adjust the output level of the Clean/B channel, and as part of the Octave level
control (see #11).
NOTE: The BX25DLX/BX50DLX employs an internal noise gate to keep residual noise to a minimum.
Regardless of which channel is selected, the Clean/B channel’s Level control (#6) must be turned up above
“0” in order for the noise gate to trigger.
7. LOW: Use this control to adjust the low frequency level of the Clean/B channel.
8. LOW MID: Use this control to adjust the lower-midrange frequency output of the Clean/B channel.
9. HIGH MID: Use this control to adjust the upper-midrange frequency output of the Clean/B channel.
10. HIGH: Use this control to adjust the high frequency output of the Clean/B channel.
11. OCTAVE: The BX25DLX/BX50DLX features internal circuitry which creates a second signal which is one
octave lower than the input signal. Use this control in conjunction with the Clean/B channel’s Level control (#6)
to adjust the level of the octave signal.
12. MASTER: Use this control to adjust the overall output level of the amplifier.
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BASS AMPLIFIER
13. CD INPUT: Use these RCA jacks to connect the line level (or headphones) output of a CD player, tape
deck or rhythm machine to the amplifier. The signal level from these jacks is adjusted by the Master control
(#12). If the signal from the source connected to these jacks is too strong, use the output level control on the
source to adjust the signal to obtain the proper level for a good mix.
14. HEADPHONES: Use this jack to listen to the amplifier through a pair of stereo headphones. The internal
speaker is disconnected when the headphones jack is used.
CAUTION: To avoid possible damage to your hearing, do not use head-
phones for extended periods of time at extremely loud listening levels.
15. POWER: Use this switch to turn the amplifier on and off. The adjacent LED illuminates when the amplifi-
er is turned on.
16. ELECTRONIC TUNER (top panel): This active
electronic tuner is on whenever the amplifier is turned
on, allowing you constant, “real-time” tuning. The tuner
is fully chromatic – use the flat and sharp indicators
until the LED between them illuminates, indicating
proper tuning.
17. AC LINE CORD (rear panel, not shown): The grounded power cord should only be plugged into a
grounded power outlet that meets all applicable electrical codes and is compatible with the voltage, power, and
frequency requirements stated on the rear panel. Do not attempt to defeat the safety ground connection.
18. FOOTSWITCH (rear panel, not shown): Connect a two-button footswitch (such as the Crate CFP-2)
here for remote control of the channel selection/“blend” (see #5”) and octave on/off. (When the Channel Switch
[#5] is depressed, the footswitch switches between the Clean/B channel and the Distortion/A channel; when
the switch is in the out position, the Clean/B channel is always active, and the footswitch turns the Distortion/A
channel on and off, allowing you a blend of both channels.)
19. EXTERNAL SPEAKER (rear panel, not shown): Use this jack to connect the amplifier to an external
speaker cabinet (BX25DLX = 4Ω minimum, BX50DLX = 8Ω minimum). The internal speaker is disconnected
when the external speaker jack is used.
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BASS AMPLIFIER
Suggested Starting Settings:
Rock:
OUT
* *
* *
* *
* *
* *
Jazz:
OUT
Country:
OUT
Funk:
OUT
Solo Fuzz:
IN
Super Fat Fuzz:
IN
*
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*As Needed
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BASS AMPLIFIER
System Block Diagram:
OCTAVE
LEVEL
TUNER
FOOT
SWITCH
A BC D EF G
BUFFER
INPUT
EQ
CHANNEL
SWITCH
LEVEL
LOW LOW HIGH HIGH
MID MID
NOISE
GATE
SHAPE
DISTORTION
LEVEL
GAIN
CD
INPUTS
L
R
SPEAKER
POWER
AMP
MASTER
EXTERNAL
SPEAKER
HEAD
PHONES
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BASS AMPLIFIER
BX25DLX/BX50DLX TECHNICAL SPECIFICATIONS:
BX25DLX
BX50DLX
Output Power Rating
27W RMS 1%THD 4Ω, 120 VAC
115dB
50W RMS 1.5%THD 4Ω 120 VAC
Gain
Channel A
115dB
Channel B
CD Inputs
Low
76dB
76dB
36dB
36dB
Tone Range
20dB @ 50Hz
24dB @ 150Hz
20dB @ 1kHz
34dB @ 10kHz
75dB
20dB @ 50Hz
24dB @ 150Hz
20dB @ 1kHz
34dB @ 10kHz
75dB
Low Mid
High Mid
High
Signal to Noise Ratio
Input Impedance
220k ohms
220k ohm
Maximum Signal Accepted
Power Requirements
7 volts, peak-to-peak
110VAC, 60Hz, 45VA
100/110VAC, 50/60Hz, 45VA
230VAC, 50/60Hz, 45VA
10”
7 volts, peak-to-peak
110VAC, 60Hz, 85VA
100/110VAC, 50/60Hz, 85VA
230VAC, 50/60Hz, 85VA
12”
Internal Speaker
Size
Type
Magnet
Crate Custom
30 oz
Crate Custom
30 oz
Voice Coil
RMS Rating
Impedance
1.0”
1.5”
30 watts
50 watts
4 ohms
8 ohms
Size
17” H x 17” W x 12” D
39 lbs
20.62” H x 17” W x 13.5” D
47 lbs
Weight
The BX25DLX/BX50DLX is covered with a durable black Tolex material: wipe it clean with a lint-free cloth.
Never spray cleaning agents onto the cabinet. Avoid abrasive cleansers which would damage the finish.
Crate continually develops new products, as well as improves existing ones. For this reason,
the specifications and information in this Crate manual are subject to change without notice.
©2002 SLM ELECTRONICS, A DIVISION OF ST. LOUIS MUSIC, 1400 FERGUSON, ST. LOUIS, MO. 63133
P/N 47-093-01 • 120202
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