BT220
BASS AMPLIFIER
USER’S GUIDE
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BT220 Bass Amplifier
Congratulations!
You are now the proud owner of the Crate BT220 Bass Amplifier. The BT220 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.” The Mute switch allows you to tune in silence without changing
the channel Level controls. A built-in Limiter keeps your sound clean even at full output
power levels, and 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 BT220 is designed by musicians and built using only the
best components. Extensive testing at the hands (and ears) of skilled technicians and musi-
cians 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 infor-
mation in this manual before you begin playing.
And thank you for choosing Crate.
Declaration Of Conformity
#30, Effective 01-01-2001
Manufacturer’s Name:
Production Facility:
SLM Electronics
1901 Congressional 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
Production Facility:
Shipping Facility:
Office Facility:
Product Type:
Audio Amplifier
Complies with the following Standards:
Safety:
EMC:
EN60065, E60065, C22.2, UL6500 and/or UL813
Directive 89/336/EEC, EN55103, EN55013, EN61000,
and/or FCC 47CFR 15B clA
Supplementary information provided by:
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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BT220 Bass Amplifier
The Front Panel:
1
2
3
4
5
6
7
8
9
10
1. INPUT: Use this 1/4” jack to connect your bass to the amplifier by means of a shielded instrument cable.
2. -15dB/0dB: Use this switch to match the output signal level of your instrument to the amplifier. If your instru-
ment has standard pickups, setting the switch to the 0dB position (switch in the out position) should yield the best
results. If your bass has active electronics or high output pickups, set the switch to the -15dB position (switch
depressed).
3. MUTE: This switch, when depressed, interrupts the signal prior to the power amplifier, allowing you to tune your
instrument in silence.
4. GAIN: Use this control to adjust the amount of distortion for the Distortion channel. As you rotate the control
clockwise the amount of distortion increases.
NOTE: The BT100 employs an internal noise gate on the Distortion channel to keep residual noise to a minimum.
The Clean channel’s Level control (#8) must be turned up above “0” in order for the noise gate to trigger proper-
ly. The Gain control (#4) and input signal level also affect the noise gate.
5. SHAPE: Use this control to adjust the tone of the Distortion channel, from a studio “V”-shaped tone to a more
“live,” more present sound.
6. LEVEL: Use this control to adjust the output level of the Distortion channel.
7. CHANNEL SWITCH: Use this switch to select either channel. With the switch in the out position, the Clean
channel is selected. When the switch is depressed, the Distortion channel is selected. The adjacent LED illumi-
nates when the Distortion channel is selected. NOTE: When using a footswitch: when this switch is depressed,
the footswitch switches between the Distortion channel and the Clean channel; when this button is in the out posi-
tion, the Clean channel is always active, and the footswitch turns the Distortion channel on and off, allowing you
a blend of both channels.
8. LEVEL: Use this control to adjust the output level of the Clean channel, and as part of the Octave level control
(see #13).
9. LOW: Use this control to adjust the low frequency output of the Clean channel.
10. LOW MID: Use this control to adjust the lower-midrange frequency output of the Clean channel.
11. HIGH MID: Use this control to adjust the upper-midrange frequency output of the Clean channel.
12. HIGH: Use this control to adjust the high frequency output of the Clean channel.
13. OCTAVE: The BT100 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 channel’s Level control (#8) to adjust the level of
the octave signal.
14. MASTER: Use this control to adjust the overall output level of the amplifier.
15. LIMIT LED: This LED illuminates when the internal limiting circuit is active. Occasional flashing during play-
ing is normal. If the Limit LED remains illuminated, reduce the output level of the amplifier until the LED flashes.
16. 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 (#14). 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.\
4
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BT220 Bass Amplifier
The Front Panel:
11
12
13
14
15
16
17
18
17. 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. To avoid possible damage to your hearing, do
not use headphones for extended periods of time at extremely loud listening levels.
18. POWER: Use this switch to turn the amplifier on and off. The adjacent LED illuminates when the amplifier is
turned on.
19. ELECTRONIC TUNER (top panel, not shown): 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 indica-
tors until the LED between them illuminates, indicating proper tuning.
The Rear Panel:
20. AC LINE CORD (not shown): The grounded
BALANCED LINE OUT
power cord should only be plugged into a ground-
PRE
POST
EFFECTS LOOP
ed 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.
23
24
GND
GND LIFT
SEND
RETURN
VOLUME
21. EXTERNAL SPEAKER: Use this jack to con-
nect the amplifier to an external speaker cabinet.
This jack is wired in series with the internal speak-
er, which remains active when this jack is used. A
4 ohm external speaker cabinet is recommended.
7
43565 15531
9
BT220
(21) SERIAL# BMCDN20083
Line: 120V Freq: 60 Pwr: XXXVA
EXTERNAL
SPEAKER
CHANNEL /
OCTAVE
FOOTSWITCH
22. FOOTSWITCH: Connect
a
two-button
footswitch (such as the Crate CFS-2) here for
remote control of the channel selection/“blend”
21
22
25
26 27
28
(see #7) and octave on/off. (When the Channel Switch [#7] is depressed, the footswitch switches between the
Clean channel and the Distortion channel; when the switch is in the out position, the Clean channel is always
active, and the footswitch turns the Distortion channel on and off, allowing you a blend of both channels.)
23. EFFECTS LOOP SEND: Use this jack to connect an external signal processor to the amplifier by means of a
shielded signal cable. Connect the other end of this cable to the input jack of the external processor.
24. EFFECTS LOOP RETURN: Use this jack to connect an external signal processor to the amplifier by means
of a shielded signal cable. Connect the other end of this cable to the output jack of the external processor.
25. BALANCED LINE OUT: Use this XLR jack to send a balanced line level signal to an external power amplifi-
er, mixing board, or recording console.
26. PRE/POST: Use this switch to determine whether the Balanced Line Out signal is Post-EQ (switch depressed)
or Pre-EQ (switch in the out position).
27. GROUND LIFT: This switch, when depressed, lifts the ground connection at the Balanced Line Out jack (#25).
This may help reduce hum in the Balanced Line Out signal.
28. VOLUME: Use this control to adjust the signal level at the Balanced Line Out jack (#25).
5
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BT220 Bass Amplifier
Suggested Starting Settings:
Rock:
OUT
OUT
OUT
OUT
IN
* *
* *
* *
* *
* *
*
Jazz:
Country:
Funk:
Solo Fuzz:
Super Fat Fuzz:
IN
6
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BT220 Bass Amplifier
System Block Diagram:
OCTAVE
LEVEL
TUNER
FOOT
SWITCH
SWITCHING
CIRCUITRY
A BC D EF G
BUFFER
EQ
INPUT
CHANNEL
SWITCH
LEVEL
-15dB PAD
LOW LOW HIGH HIGH
MID
MID
NOISE
GATE
SHAPE
DISTORTION
LEVEL
GAIN
EFFECTS LOOP
SEND
RETURN
EFFECTS
BLEND
MUTE
MASTER
CD
INPUT
LIMIT
PRE
BALANCED
LINE OUT
SPEAKER
POST
BALANCED
LINE OUT
VOLUME
POWER
AMP
GND/
GND
LIFT
EXTERNAL
SPEAKER
ATTENUATOR
HEAD
PHONES
7
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BT220 Bass Amplifier
BT220 Technical Specifications:
Output Power Rating
Gain
220W RMS 2% THD, 4Ω, 120 VAC
Distortion Channel
Clean Channel
CD Inputs
103dB
61dB
33dB
Tone Range
Low
Lo Mid
Hi Mid
High
20dB @ 50Hz
24dB @ 150Hz
18dB @ 1kHz
32dB @ 10kHz
Signal to Noise Ratio
Input Impedance
65dB below full power, tones flat, gain and level @ “10”
220k ohms
Maximum Input Signal Level Accepted
Balanced Line Out Jack
15 volts peak-to-peak
2 volts peak-to-peak @ full rated power w/600 ohm load
Internal Speaker
Size
15”
Type
Magnet
Crate Custom Cast Frame
66 oz.
2.5”
Voice Coil
RMS Rating
Impedance
250 watts
4 ohms
Input Power Requirements
120 VAC, 60Hz, 250VA
100/115VAC, 50/60Hz, 250VA
230VAC, 50/60Hz, 250VA
Size
24-1/2” H* x 24-1/2” W x 16-1/2” D
Weight
87 lbs
*without casters
Specifications subject to change without notice
©2003 ST. LOUIS MUSIC, 1400 FERGUSON, ST. LOUIS, MO. 63133
47-349-01 • 012904
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