Owner’s Manual
for the
BX-220H / BX-2115
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LINE OUT
LEVEL
5
EFFECTS
BLEND
5
HEADPHONES
INCREASE
GAIN
MASTER
LEVEL
POWER
GAIN
CONTOUR
5
5
5
INPUT
4
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OK
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1
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1
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1
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1
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1
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1
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DECREASE
GAIN
0
10
0
10
0
10
0
10
0
10
40
100 225 625 1.6k 4k
8k
16k
–
15dB
CONTOUR
ON/OFF
LIMIT
POST/PRE
BX-220H
HEADPHONES
®
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LINE OUT
LEVEL
5
EFFECTS
BLEND
5
HEADPHONES
INCREASE
GAIN
MASTER
LEVEL
SPECTRUM
DEPTH
RATE
5
POWER
GAIN
CONTOUR
5
5
5
250
5
INPUT
4
6
4
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4
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0
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OK
2
8
2
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2
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2
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2
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2
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2
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2
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CHORUS
ON/ OFF
1
9
1
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1
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1
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1
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1
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1
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1
9
DECREASE
GAIN
ACTIVE
0
10
0
10
0
10
0
10
0
10
0
10
10
F
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L
L
500
40
100 225 625 1.6k 4k
8k
16k
BX-2115
–
15dB
CONTOUR
ON/OFF
LIMIT
POST/PRE
®
HEADPHONES
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BX-220H / BX-2115 ThunderBass Amplifier
Introduction:
Crate’s new BX-220H/BX-2115 ThunderBass amplifiers are feature-packed, professional-strength power-
houses which can deliver incredible bass sounds. Rugged construction, reliable American craftsmanship and
solid state electronics add up to create one very roadworthy, stage-ready piece of gear.
The BX-220H packs solid performance into a compact head unit, contained in a rugged Tolex® covered
cabinet. Its side-mounted handle and heavy-duty rubber feet on two sides (not just the bottom, but also on
the end you set it down on in real life) increase its value to those musicians who are always “on the go.” The
BX-2115 combines the same great bass amp with an equally outstanding 15” ThunderBass American-made
transducer for a small but hard-hitting combo amp suitable for the club, small hall or recording studio. An
optional JBL 15” bass transducer is also available (BX-2115L).
Both amplifiers will deliver 220 watts into 4 ohms, or 150 watts into 8 ohms. A listing of the features of
these amps is given below.
Features:
Additional information can be found on the pages indicated.
• Solid state circuitry for reliable service and incredible tones.
• Crate’s APM (Automatic Power Maximizer) limiter circuit for the most output without distortion.
• Variable input gain control with -15dB pad switch and 3 input icon LEDs for the best match between
your bass and the amplifier (page 4).
• Switchable contour control (page 4).
• 8-band graphic equalizer for optimum tone control (page 4).
• Switchable chorus with adjustable spectrum, rate and depth controls (BX-2115 only) (page 4).
• Balanced line out with adjustable level control and “pre/post” switch (pages 4 and 5).
• Headphone jack with adjustable level control for private practice sessions (page 4).
• Effects loop for noiseless use of your favorite processors and effects (page 5).
• Rugged Tolex® covered cabinets for durability with nickel and chrome accents for high cosmetic appeal.
• Removable heavy duty casters for ease of transportation (BX-2115/2115L only).
• Musician made in the U.S.A.
• Crate’s exclusive 5-year warranty (U.S. only - see your dealer in other areas for warranty information)
3
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BX-220H / BX-2115 ThunderBass Amplifier
The Front Panel:
1
2 4
5
7
8 10 12 13
1516 17 18 19
20
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EFFECTS
BLEND
5
HEADPHONES
LINE OUT
LEVEL
5
INCREASE
GAIN
LEVEL
SPECTRUM
DEPTH
RATE
5
POWER
MASTER
GAIN
CONTOUR
5
5
5
5
250
INPUT
4
6
4
6
4
6
4
6
4
6
4
6
4
6
4
0
6
3
7
3
7
3
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3
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3
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3
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3
7
8
3
7
OK
2
8
2
8
2
8
2
8
2
8
2
8
2
2
8
CHORUS
ON/ OFF
1
9
1
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1
9
1
9
1
9
1
9
1
9
1
9
DECREASE
GAIN
ACTIVE
0
10
0
10
0
10
0
10
0
10
0
10
10
FULL
500
40
100 225 625 1.6k 4k
8k
16k
BX-2115
–
15dB
CONTOUR
ON/OFF
LIMIT
POST/PRE
®
HEADPHONES
3
6
9 11
14
1. INPUT: Connect your bass to the tailor your tone. Each slider controls the 13. HEADPHONES LEVEL: This con-
amplifier here.
frequency indicated directly below it and trol adjusts the signal level at the
offers a cut or boost of 10dB at various Headphones jack (#14).
2. GAIN: Use this control to properly
match the output of your bass to the
frequencies from 40Hz to 16kHz
14. HEADPHONES: Plug a pair of
amplifier. With the amp’s Master level 8. MASTER LEVEL: Use this control stereo headphones in here for private lis-
control at “0”, begin playing your bass as to set the output level of the amplifier. tening. The signal at this jack is post Gain
you normally would. Watch the adjacent This controls the signal level at the and post EQ. The level of the signal here
LEDs (#4) as you turn up the Gain con- Speaker Output jacks (#24), as well as is determined by the setting of the
trol: the proper setting for the Gain con- the Preamp Out jack (#22).
trol is the one where the “OK” LED lights
Headphones Level control (#13). Using
headphones does not disable the speak-
er outputs or the internal speaker (BX-
2115). You may also use this output (or
the line out jack, #25) to run a signal to
a tuner.
9. LIMIT: The amplifier employs
most often while playing. If the
“Decrease Gain” LED stays lit even with
the Gain control turned down low, press
in the -15dB button (#3) and continue
adjusting the Gain control until the prop-
er setting is obtained.
Crate’s APM
Automatic Power
Maximizer protection circuitry to keep
the output distortion-free even at high
volume levels. Whenever the output
nears its clipping point, the limit circuit 15-19, Chorus Section, BX-2115/2115L
kicks in to keep the output clean. The Only
3. -15dB: If your bass has active elec- Limit LED lights up when the APM lim-
tronics or “hot” pickups, its output signal iter circuit is activated. Occasional flash- 15. CHORUS ON/OFF: This switch
may need to be padded to get the best ing of the LED is normal. Very frequent turns the Chorus section on when
signal to noise setting from the Gain con- flashing or constant illumination indicates pressed in, off when switched out.
trol. If the “Decrease Gain” LED stays lit the output level is too high; reduce the
16. SPECTRUM: This control allows
you to adjust which frequencies (from
the entire range to only above 500Hz)
with the Gain control turned down low, Master level control and/or your instru-
press in the -15dB button.
ment’s output until the LED flashes less.
4. LEDs: These three LEDs are your 10. LINE OUT LEVEL: This controls are enhanced by the chorus effect. The
guide to properly setting the Gain con- the level of the signal at the Balanced further to the left (toward “Full”) you
trol. Follow the steps given for the Gain Line Out jack (#25). You may also use turn the control the broader the spec-
control (#2) until the “OK” LED lights this output (or the headphone jack, #14) trum of the chorus effect.
most often while you play.
to run a signal to a tuner.
17. DEPTH: This control sets the
5. CONTOUR: This control allows you 11. POST/PRE : This switch selects the amount of chorus enhancement:
to make additional changes to your tone tap point for the signal at the Balanced towards “0” for less, towards “10” for
and is active only when the Contour Line Out jack. With the switch out, the more.
On/Off switch (#6) is pressed in. As the signal is tapped before the eq, contour
“wave” icons indicate you can enhance and effects loop (“pre”). With the switch
both the lows and highs at the same pressed in, the signal is tapped after the
18. RATE: This control sets the speed for
the chorus effect: towards “0” for slower,
towards “10” for faster.
time, or add mid punch.
eq, contour and effects loop (“post”).
19. ACTIVE: This LED lights when the
chorus effect is engaged. The LED puls-
es in relation to the rate of the chorus.
6. CONTOUR ON/OFF:
switch to engage the contour circuitry. proportions the amount of effect added
With the switch pressed in, the Contour to the signal going to the power amp
Use this 12. EFFECTS BLEND: This control
control (#5) is active.
stage. At the “0” position the signal is
“dry” (no effect added); as you bring the
control towards “10” the amount of
effect applied increases. (“5” is a 50/50
blend of dry signal and effects.)
20. POWER: This two-position switch
turns the amp on and off, “on” being the
UP position. The switch lights up when
the amp is turned on.
7. EQUALIZATION: This eight-band
graphic equalizer allows you to custom
4
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BX-220H / BX-2115 ThunderBass Amplifier
The Rear Panel:
21
22 23
PREAMP
OUT
EFFECTS
LOOP
PWR AMP
IN
RETURN
27
26
SEND
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS:
RISQUE DE CHOC
ELECTRIQUE. NE PAS OUVRIR.
WARNING: TO REDUCE THE
RISK OF ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
S
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MODEL: BX-2215
SERIAL: BX2215PHD0312
150W
220W
@
@
8
4
OHMS
OHMS
MIN. LOAD
LINE: 120
WATTS: 550
V
~
60
Hz
MAX
MADE IN THE U.S.A.
BY SLM ELECTRONICS
1400 FERGUSON AVE.
ST. LOUIS, MO 63133
BALANCED
LINE OUT
24 25
21. POWER CORD: Connect the male 24. SPEAKERS: Use these jacks to con- (#10). This signal is switchable to be
end of this cord to a properly grounded
AC power outlet. Use only a grounded
outlet! DO NOT defeat the ground pin
of the cord! If the amplifier is used out-
side of the United States, see the area’s
Crate dealer for the proper power cord
or consult a local professional electrician.
either pre or post EQ through the front
panel Pre/Post switch(#11).
nect the amp to your speaker cabinet(s).
Use heavy-duty speaker cables with
mono 1/4” plugs. These jacks are wired
in parallel. Don’t use cabinet combina-
tions resulting in impedance loads below
4 ohms. Use the chart below to help
determine parallel loads. If in doubt, ask
your dealer.
26. EFFECTS LOOP SEND: This
unbalanced jack lets you send a signal
out to an external effects processor or
tuner. The signal at this jack is post-EQ,
pre-Master. Connect this to the input
jack of the processor or tuner.
22. PREAMP OUT: A pre-amplified
line-level signal may be tapped from this
jack for sending to an external amplifier,
powered monitor, recording console,
mixing board or effects processor. This is
an unbalanced, mono 1/4” jack.
27. EFFECTS LOOP RETURN: This
jack receives the signal from the output
jack of an external effects processor. Use
shielded cables with mono 1/4” plugs for
connecting the Effects Loop.
Cab Imp.
8 ohms
# Cabs
Total Imp.
4 ohms
8 ohms
4 ohms
2
2
4
16 ohms
16 ohms
23. POWER AMP IN: A pre-amplified
line level signal may be sent directly into
the bass amp’s power amp (as when
slaving two amplifiers together, for exam-
ple). Connection to this jack interrupts
the signal from the internal preamp to
the power amp. The Preamp Out (#22)
signal is not interrupted.
25. BALANCED LINE OUT: Use this
3-pin XLR jack to send a line level signal
to the house sound board or mixing con-
sole. The level of the signal at this jack is
determined by the setting of the Line
Out Level control on the front panel
5
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BX-220H / BX-2115 ThunderBass Amplifier
Some Suggested Settings:
Rock:
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EFFECTS
BLEND
5
HEADPHONES
LINE OUT
LEVEL
5
INCREASE
GAIN
LEVEL
SPECTRUM
DEPTH
RATE
MASTER
GAIN
CONTOUR
5
5
5
5
5
250
4
0
6
4
6
4
6
4
6
4
6
4
6
4
6
4
0
6
3
7
3
7
3
7
3
7
3
7
3
7
3
7
8
3
7
OK
2
8
2
8
2
8
2
8
2
8
2
8
2
2
8
CHORUS
ON/ OFF
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
DECREASE
GAIN
10
0
10
0
10
0
10
0
10
0
10
10
FULL
500
(2115/2115L ONLY)
40
100 225 625 1.6k 4k
8k
16k
16k
16k
16k
B1
BX-21
B1
B1
– 15dB
CONTOUR
ON/OFF
LIMIT
POST/PRE
AS NEEDED
OUT
OUT
OUT
OUT
IN
Jazz:
N
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E Q U A L I Z A T I O N
M
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EFFECTS
BLEND
5
HEADPHONES
LINE OUT
LEVEL
5
INCREASE
GAIN
LEVEL
SPECTRUM
DEPTH
RATE
5
MASTER
GAIN
CONTOUR
5
5
5
5
250
4
6
4
6
4
6
4
6
4
6
4
6
4
6
4
0
6
3
7
3
7
3
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3
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3
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3
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3
7
8
3
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OK
2
8
2
8
2
8
2
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2
8
2
8
2
2
8
CHORUS
ON/ OFF
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
DECREASE
GAIN
0
10
0
10
0
10
0
10
0
10
0
10
10
FULL
500
(2115/2115L ONLY)
40
100 225 625 1.6k 4k
8k
– 15dB
CONTOUR
ON/OFF
LIMIT
POST/PRE
AS NEEDED
IN
Country:
N
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E Q U A L I Z A T I O N
M
A
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T
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C
H
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EFFECTS
BLEND
5
HEADPHONES
LINE OUT
LEVEL
5
INCREASE
GAIN
LEVEL
SPECTRUM
DEPTH
RATE
5
MASTER
GAIN
CONTOUR
5
5
5
5
250
4
0
6
4
6
4
6
4
6
4
6
4
6
4
6
4
0
6
3
7
3
7
3
7
3
7
3
7
3
7
3
7
8
3
7
OK
2
8
2
8
2
8
2
8
2
8
2
8
2
2
8
CHORUS
ON/ OFF
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
DECREASE
GAIN
10
0
10
0
10
0
10
0
10
0
10
10
FULL
500
(2115/2115L ONLY)
40
100 225 625 1.6k 4k
8k
– 15dB
CONTOUR
ON/OFF
LIMIT
POST/PRE
AS NEEDED
IN
Funk:
N
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M
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EFFECTS
BLEND
5
HEADPHONES
LINE OUT
LEVEL
5
INCREASE
GAIN
LEVEL
SPECTRUM
DEPTH
RATE
5
MASTER
GAIN
CONTOUR
5
5
5
5
250
4
0
6
4
6
4
6
4
6
4
6
4
6
4
6
4
0
6
3
7
3
7
3
7
3
7
3
7
3
7
3
7
8
3
7
OK
2
8
2
8
2
8
2
8
2
8
2
8
2
2
8
CHORUS
ON/ OFF
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
DECREASE
GAIN
10
0
10
0
10
0
10
0
10
0
10
10
FULL
500
(2115/2115L ONLY)
40
100 225 625 1.6k 4k
8k
– 15dB
CONTOUR
ON/OFF
LIMIT
POST/PRE
AS NEEDED
IN
6
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BX-220H / BX-2115 ThunderBass Amplifier
System Block Diagram:
INPUT
8 BAND
GRAPHIC
CONTOUR
ON / OFF
EFFECTS
SEND
GAIN
-15dB PAD
PEAK
LED
EFFECTS
BLEND
EFFECTS
RETURN
CHORUS
∑
CHORUS ON
MASTER
POST
PRE
BX-2215/L
ONLY
BALANCED
LINE OUT
SPECTRUM DEPTH RATE
LINE OUT
LEVEL
PREAMP
OUT
POWER
AMP IN
POWER
AMP
SPEAKER
OUT
LIMIT
LED
SPEAKER
OUT
HEAD-
PHONES
HEADPHONE
LEVEL
7
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BX-220H / BX-2115 ThunderBass Amplifier
Technical Specifications:
Maximum Input Signal Level Accepted
Input Power Requirements
Input Impedance
17 volts peak to peak (-15dB switch pressed in)
120VAC, 60Hz, 550 watts max.
500k ohms (-15dB switch out), 75k ohms (-15dB switch in)
75dB typical
Signal to Noise Ratio
Output Power Rating
160 watts RMS @ < 5% THD w/8 ohm load, 120VAC line
220 watts RMS @ < 5% THD w/4 ohm load, 120VAC line
Gain @ 1kHz
EQ Section
67dB with EQ flat, Contour off
20dB range ( 10dB) @ 40Hz, 100Hz, 225Hz, 625Hz, 1.6kHz,
4kHz, 8kHz and 16kHz
Internal Speaker
Size/Type
Magnet
BX-2115
15” ThunderBass
56 oz
BX-2115L
15” JBL M-151
256 oz (magnet assembly)
Voice Coil
Impedance
2-1/2”
3”
8 ohms
8 ohms
Size and Weight, BX-220H
Size and Weight, BX-2115
Size and Weight, BX-2115L
7-1/8”H1 x 19-1/2”W1 x 12”D, 30lbs.
23-5/8”H2 x 24”W x 15-3/4”D, 78lbs.
23-5/8”H2 x 24”W x 15-3/4”D, 84lbs.
1including rubber feet
2without casters installed; casters add 1-3/4” to height
CRATE continually develops new products, as well as improves existing ones. For this reason,
specifications and information in this manual are subject to change without notice.
©1996 CRATE/SLM ELECTRONICS, A DIVISION OF ST. LOUIS MUSIC, 1400 FERGUSON AVENUE, ST. LOUIS, MO 63133
47-589-01 • 01-96
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