Crate BX-220H User manual

BX-220H
OK
CONTOUR
CONTOUR
ON/OFF
INCREASE 
GAIN
DECREASE 
GAIN
– 15dB
MASTER
LINE OUT
LEVEL
EFFECTS
BLEND
HEADPHONES
LEVEL
POST/PRE
LIMIT
PO ER
PO ER
®
GAIN
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
1
2
37
9
8
46
INPUT
HEADPHONES
BX-2115
INPUT CONTOUR
GAIN
CONTOUR
ON/OFF
– 15dB
MASTER
LINE OUT
LEVEL
EFFECTS
BLEND
HEADPHONES
LEVEL
LIMIT ®

SPECTRUM

DEPTH

RATE
ACTIVE
CHORUS
ON/ OFF
HEADPHONES
PO ER
PO ER
OK
INCREASE 
GAIN
DECREASE 
GAIN
0
110
2
3
5
7
9
8
46
1
2
37
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
FULL 500
250
0
110
2
3
5
7
9
8
46
40 100 225 625 1.6k 4k 8k 16k POST/PRE
PO ER
PO ER
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40 100 225 625 1.6k 4k 8k 16k
EQUALIZATION MASTER
INPUT
EQUALIZATION MASTER CHORUS
INPUT
for the
Owner’s Manual
BX-220H / BX-2115
BX-220H / BX-2115

Congratulations!
You are now the proud owner of the innovative Crate BX-220H/BX-2115 ThunderBass amp. These fea-
ture-pac ed powerhouses offer you solid state reliability with classic Crate performance.
Li e all Crate products, your BX-220H/BX-2115 ThunderBass amp is Musician Made in the U.S.A., using
only the best components. Extensive testing at many stages in its production, including a final “audition” by
a s illed musician, insures you that your BX-220H/BX-2115 ThunderBass amp is the best it can be.
In order to get the best possible performance, please read this manual before you use the amplifier.
And thank you for choosing .
Contents:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . .3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
The Front Panel . . . . . . . . . . . . . . . . . . . . . .4
The Rear Panel . . . . . . . . . . . . . . . . . . . . . .5
Some Suggested Settings . . . . . . . . . . . . . . .6
System Bloc Diagram . . . . . . . . . . . . . . . . .7
Technical Specifications . . . . . . . . . .bac cover
THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF
THE UNIT AND PREVENT ACCIDENTAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES:
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN CHASSIS; DO NOT DEFEAT OR REMOVE THE GROUND PIN OF THE POWER
CORD; CONNECT ONLY TO A PROPERLY GROUNDED AC POWER OUTLET.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
CAUTION: IF YOU USE AUDIO AMPLIFIERS PROFESSIONALLY OR IN WORK RELATED SITUATIONS AS AN EMPLOYEE, THE OCCUPATIONAL SAFETY
AND HEALTH ADMINISTRATION (OSHA) HAS SPECIFIED REGULATIONS CONCERNING PROLONGED EXPOSURE TO HIGH SOUND PRESSURE LEV-
ELS. PLEASE REFER TO THE CODE OF FEDERAL REGULATIONS DOCUMENT 29CFR1910 FOR ADDITIONAL INFORMATION.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
ATTENTION
RISQUE D'ELECTROCUTION
NE PAS OUVRIR
ATTENTION: POUR REDUIRE D'ELECTROCUTION NE PAS
ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE
PAR L'UTILISATEUR. POUR TOUTE REPARATION, S'ADRESSER A UN
TECHNICIEN QUALIFIE.
VORSICHT
ELEKTRISCHE SCHLAGGEFAHR
NICHT OFFENEN
VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT
DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM
BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM
WARTUNGSPERSONAL ZU UBERLASSEN.
"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"
"REFERREZ-VOUS AU MANUAL D'UTILISATION"
"UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN"
EXPLANATION OF
GRAPHICAL SYMBOLS:
"DANGEROUS VOLTAGE"
"DANGER HAUTE TENSION"
"GEFAHLICHE SPANNUNG"
==
22
BX-220H / BX-2115
BX-220H / BX-2115 ThunderBass Amplifier

Introduction:
Crate’s new BX-220H/BX-2115 ThunderBass amplifiers are feature-pac ed, 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 pac s 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 jac 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 nic el 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)
BX-220H / BX-2115
BX-220H / BX-2115 ThunderBass Amplifier

1. INPUT: Connect your bass to the
amplifier here.
2. GAIN: Use this control to properly
match the output of your bass to the
amplifier. With the amp’s Master level
control at “0”, begin playing your bass as
you normally would. Watch the adjacent
LEDs (#4) as you turn up the Gain con-
trol: the proper setting for the Gain con-
trol is the one where the “OK” LED lights
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.
3. -15dB: If your bass has active elec-
tronics or “hot” pic ups, its output signal
may need to be padded to get the best
signal to noise setting from the Gain con-
trol. If the “Decrease Gain” LED stays lit
with the Gain control turned down low,
press in the -15dB button.
4. LEDs: These three LEDs are your
guide to properly setting the Gain con-
trol. Follow the steps given for the Gain
control (#2) until the “OK” LED lights
most often while you play.
5. CONTOUR: This control allows you
to ma e additional changes to your tone
and is active only when the Contour
On/Off switch (#6) is pressed in. As the
“wave” icons indicate you can enhance
both the lows and highs at the same
time, or add mid punch.
6. CONTOUR ON/OFF: Use this
switch to engage the contour circuitry.
With the switch pressed in, the Contour
control (#5) is active.
7. EQUALIZATION: This eight-band
graphic equalizer allows you to custom
tailor your tone. Each slider controls the
frequency indicated directly below it and
offers a cut or boost of 10dB at various
frequencies from 40Hz to 16 Hz
. MASTER LEVEL: Use this control
to set the output level of the amplifier.
This controls the signal level at the
Spea er Output jac s (#24), as well as
the Preamp Out jac (#22).
9. LIMIT: The amplifier employs
Crate’s APM Automatic Power
Maximizer protection circuitry to eep
the output distortion-free even at high
volume levels. Whenever the output
nears its clipping point, the limit circuit
ic s in to eep the output clean. The
Limit LED lights up when the APM lim-
iter circuit is activated. Occasional flash-
ing of the LED is normal. Very frequent
flashing or constant illumination indicates
the output level is too high; reduce the
Master level control and/or your instru-
ment’s output until the LED flashes less.
10. LINE OUT LEVEL: This controls
the level of the signal at the Balanced
Line Out jac (#25). You may also use
this output (or the headphone jac , #14)
to run a signal to a tuner.
11. POST/PRE : This switch selects the
tap point for the signal at the Balanced
Line Out jac . With the switch out, the
signal is tapped before the eq, contour
and effects loop (“pre”). With the switch
pressed in, the signal is tapped after the
eq, contour and effects loop (“post”).
12. EFFECTS BLEND: This control
proportions the amount of effect added
to the signal going to the power amp
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.)
13. HEADPHONES LEVEL: This con-
trol adjusts the signal level at the
Headphones jac (#14).
14. HEADPHONES: Plug a pair of
stereo headphones in here for private lis-
tening. The signal at this jac is post Gain
and post EQ. The level of the signal here
is determined by the setting of the
Headphones Level control (#13). Using
headphones does not disable the spea -
er outputs or the internal spea er (BX-
2115). You may also use this output (or
the line out jac , #25) to run a signal to
a tuner.
15-19, Chorus Section, BX-2115/2115L
Only
15. CHORUS ON/OFF: This switch
turns the Chorus section on when
pressed in, off when switched out.
16. SPECTRUM: This control allows
you to adjust which frequencies (from
the entire range to only above 500Hz)
are enhanced by the chorus effect. The
further to the left (toward “Full”) you
turn the control the broader the spec-
trum of the chorus effect.
17. DEPTH: This control sets the
amount of chorus enhancement:
towards “0” for less, towards “10” for
more.
1 . RATE: This control sets the speed for
the chorus effect: towards “0” for slower,
towards “10” for faster.
19. ACTIVE: This LED lights when the
chorus effect is engaged. The LED puls-
es in relation to the rate of the chorus.
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.
The Front Panel:
BX-2115
EQUALIZATION MASTER CHORUS
INPUT
INPUT CONTOUR
GAIN
CONTOUR
ON/OFF
– 15dB
MASTER
LINE OUT
LEVEL
EFFECTS
BLEND
HEADPHONES
LEVEL
LIMIT ®

SPECTRUM

DEPTH

RATE
ACTIVE
CHORUS
ON/ OFF
HEADPHONES
PO ERPO ER
OK
INCREASE 
GAIN
DECREASE 
GAIN
0
110
2
3
5
7
9
8
46
1
2
37
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
FULL 500
250
0
110
2
3
5
7
9
8
46
40 100 225 625 1.6k 4k 8k 16k POST/PRE
1
44
2 4 5 7 8 10 12 1 16 17 18 1915 20
6 9 11 14
BX-220H / BX-2115
BX-220H / BX-2115 ThunderBass Amplifier

21. POWER CORD: Connect the male
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.
22. PREAMP OUT: A pre-amplified
line-level signal may be tapped from this
ack for sending to an external amplifier,
powered monitor, recording console,
mixing board or effects processor. This is
an unbalanced, mono 1/4” ack.
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 ack interrupts
the signal from the internal preamp to
the power amp. The Preamp Out (#22)
signal is not interrupted.
24. SPEAKERS: Use these acks to con-
nect the amp to your speaker cabinet(s).
Use heavy-duty speaker cables with
mono 1/4” plugs. These acks 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.
Cab Imp. # Cabs Total Imp.
ohms 2 4 ohms
16 ohms 2 ohms
16 ohms 4 4 ohms
25. BALANCED LINE OUT: Use this
3-pin XLR ack to send a line level signal
to the house sound board or mixing con-
sole. The level of the signal at this ack is
determined by the setting of the Line
Out Level control on the front panel
(#10). This signal is switchable to be
either pre or post EQ through the front
panel Pre/Post switch(#11).
26. EFFECTS LOOP SEND: This
unbalanced ack lets you send a signal
out to an external effects processor or
tuner. The signal at this ack is post-EQ,
pre-Master. Connect this to the input
ack of the processor or tuner.
27. EFFECTS LOOP RETURN: This
ack receives the signal from the output
ack of an external effects processor. Use
shielded cables with mono 1/4” plugs for
connecting the Effects Loop.
MODEL:
SERIAL:
LINE: V ~ Hz
WATTS: MAX
BX-2215
BX2215PHD0312
120 60
550
MADE IN THE U.S.A.
BY SLM ELECTRONICS
1400 FERGUSON AVE.
ST. LOUIS, MO 63133
PREAMP
OUT
EFFECTS
LOOP
BALANCED
LINE OUT
PWR AMP
IN RETURN
SEND
S
P
E
A
K
E
R
S
150W @ 8 OHMS
220W @ 4 OHMS
MIN. LOAD
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO REDUCE THE
RISK OF ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
AVIS: RISQUE DE CHOC
ELECTRIQUE. NE PAS OUVRIR.
The Rear Panel:
55
21 22 23
24 25
26
27
BX-220H / BX-2115
BX-220H / BX-2115 ThunderBass Amplifier

BX-21
EQUALIZATION MASTER
INPUT
CONTOUR
GAIN
CONTOUR
ON/OFF
– 15dB
MASTER
LINE OUT
LEVEL
EFFECTS
BLEND
HEADPHONES
LEVEL
LIMIT

SPECTRUM

DEPTH

RATE
CHORUS
ON/ OFF
OK
INCREASE 
GAIN
DECREASE 
GAIN
0
110
2
3
5
7
9
8
46
1
2
37
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
FULL 500
250
0
110
2
3
5
7
9
8
46
40 100 225 625 1.6k 4k 8k 16k POST/PRE
CHORUS
BX-21
EQUALIZATION MASTER
INPUT
CONTOUR
GAIN
CONTOUR
ON/OFF
– 15dB
MASTER
LINE OUT
LEVEL
EFFECTS
BLEND
HEADPHONES
LEVEL
LIMIT

SPECTRUM

DEPTH

RATE
CHORUS
ON/ OFF
OK
INCREASE 
GAIN
DECREASE 
GAIN
0
110
2
3
5
7
9
8
46
1
2
37
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
FULL 500
250
0
110
2
3
5
7
9
8
46
40 100 225 625 1.6k 4k 8k 16k POST/PRE
CHORUS
BX-21
EQUALIZATION MASTER
INPUT
CONTOUR
GAIN
CONTOUR
ON/OFF
– 15dB
MASTER
LINE OUT
LEVEL
EFFECTS
BLEND
HEADPHONES
LEVEL
LIMIT

SPECTRUM

DEPTH

RATE
CHORUS
ON/ OFF
OK
INCREASE 
GAIN
DECREASE 
GAIN
0
110
2
3
5
7
9
8
46
1
2
37
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
FULL 500
250
0
110
2
3
5
7
9
8
46
40 100 225 625 1.6k 4k 8k 16k POST/PRE
CHORUS
BX-21
EQUALIZATION MASTER
INPUT
CONTOUR
GAIN
CONTOUR
ON/OFF
– 15dB
MASTER
LINE OUT
LEVEL
EFFECTS
BLEND
HEADPHONES
LEVEL
LIMIT

SPECTRUM

DEPTH

RATE
CHORUS
ON/ OFF
OK
INCREASE 
GAIN
DECREASE 
GAIN
0
110
2
3
5
7
9
8
46
1
2
37
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
0
110
2
3
5
7
9
8
46
FULL 500
250
0
110
2
3
5
7
9
8
46
40 100 225 625 1.6k 4k 8k 16k POST/PRE
CHORUS
AS NEEDED OUT OUT
AS NEEDED IN OUT
AS NEEDED IN OUT
AS NEEDED IN IN
(2115/2115L ONLY)
(2115/2115L ONLY)
(2115/2115L ONLY)
(2115/2115L ONLY)
(2115/2115L ONLY)
(2115/2115L ONLY)
(2115/2115L ONLY)
(2115/2115L ONLY)
Some Suggested Settings:
66
BX-220H / BX-2115
BX-220H / BX-2115 ThunderBass Amplifier
Rock:
Jazz:
Country:
Funk:

System Block Diagram:
77
INPUT
POWER
AMP
-15dB PAD
GAIN
PREAMP
OUT
EFFECTS
SEND
PEAK
LED
8 BAND
GRAPHIC
ON / OFF
CHORUS ON
PRE
POST
EFFECTS
RETURN
LIMIT
LED
SPECTRUM DEPTH RATE
MASTER
HEADPHONE
LEVEL
∑
POWER
AMP IN
SPEAKER
OUT
SPEAKER
OUT
HEAD-
PHONES
LINE OUT
LEVEL
BALANCED
LINE OUT
CHORUS
CONTOUR
EFFECTS
BLEND
BX-2215/L
ONLY
BX-220H / BX-2115
BX-220H / BX-2115 ThunderBass Amplifier

Technical Specifications:
©1996 CRATE/SLM ELECTRONICS, A DIVISION OF ST. LOUIS MUSIC, 1400 FERGUSON AVENUE, ST. LOUIS, MO 63133 47-589-01 •01-96
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.
BX-220H / BX-2115
BX-220H / BX-2115 ThunderBass Amplifier
Maximum Input Signal Level Accepted 17 volts pea to pea (-15dB switch pressed in)
Input Power Requirements 120VAC, 60Hz, 550 watts max.
Input Impedance 500 ohms (-15dB switch out), 75 ohms (-15dB switch in)
Signal to Noise Ratio 75dB typical
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 67dB with EQ flat, Contour off
EQ Section 20dB range (±10dB) @ 40Hz, 100Hz, 225Hz, 625Hz, 1.6 Hz,
4 Hz, 8 Hz and 16 Hz
Internal Speaker BX-2115 BX-2115L
Size/Type 15” ThunderBass 15” JBL M-151
Magnet 56 oz 256 oz (magnet assembly)
Voice Coil 2-1/2” 3”
Impedance 8 ohms 8 ohms
Size and Weight, BX-220H 7-1/8”H1x 19-1/2”W1x 12”D, 30lbs.
Size and Weight, BX-2115 23-5/8”H2x 24”W x 15-3/4”D, 78lbs.
Size and Weight, BX-2115L 23-5/8”H2x 24”W x 15-3/4”D, 84lbs.
1including rubber feet
2without casters installed; casters add 1-3/4” to height