Crate BXH-220 User manual

for the
Owner’s Manual
BXH-220
BASS AMPLIFIER
INPUT GAIN CONTOUR LEVEL
MASTERINPUT EQUALIZATION
POWER
LINE OUT
LEVEL
EFFECTS
BLEND
HEADPHONES
LEVEL
LIMIT POST EQ
PRE EQ
ON–15dB
DECREASE
GAIN
INCREASE
GAIN
OK
40 100 225 625 1.6k 4k 8k 16k

Congratulations!
You are now the proud owner of the innovative Crate BXH-220 Bass amplifier. This feature-packed pow-
erhouse offers you solid state relia ility with classic Crate performance and high cosmetic appeal.
Like all Crate products, your BXH-220 Bass amp is Musician Made in the U.S.A., using only the est com-
ponents. Extensive testing at many stages in its production, including a final “audition” y a skilled musician,
insures you that your BXH-220 Bass amp is the est it can e.
In order to get the est possi le performance, please read this manual efore 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 Block Diagram . . . . . . . . . . . . . . . . .7
Technical Specifications . . . . . . . . . . ack 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 USEAUDIO AMPLIFIERS PROFESSIONALLY OR IN WORK RELATED SITUATIONSAS 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"
==
2
BXH-220 BASS AMPLIFIER

Introduction:
Crate’s new BXH-220 Bass amplifier is a feature-packed, professional-strength powerhouse which can
deliver incredi le ass sounds. Rugged construction, relia le American craftsmanship and solid state elec-
tronics add up to create one very roadworthy, stage-ready piece of gear.
The BXH-220 packs solid performance into a compact head unit, contained in a rugged Tolex®covered
ca inet. Its side-mounted handle and heavy-duty ru er feet on two sides (not just the ottom, ut 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
amplifier will deliver 220 watts into 4 ohms, or 150 watts into 8 ohms. A listing of the features of the amp is
given elow.
Features:
Additional information can e found on the pages indicated.
• Solid state circuitry for relia le service and incredi le tones.
• Crate’s APM (Automatic Power Maximizer) limiter circuit for the most output without distortion.
• Varia le input gain control with -15dB pad switch and 3 input icon LEDs for the est match etween
your ass and the amplifier (page 4).
• Switcha le contour control (page 4).
• 8- and graphic equalizer for optimum tone control (page 4).
• Balanced line out with adjusta le level control and “pre/post” switch (pages 4 and 5).
• Headphone jack with adjusta le level control for private practice sessions (page 4).
• Effects loop for noiseless use of your favorite processors and effects (page 5).
• 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)
BXH-220 BASS AMPLIFIER
3

1. INPUT: Connect your ass to the
amplifier here.
2. GAIN: Use this control to properly
match the output of your ass to the
amplifier. With the amp’s Master level
control at “0”, egin playing your ass 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 utton (#3) and continue
adjusting the Gain control until the prop-
er setting is o tained.
3. -15dB: If your ass has active elec-
tronics or “hot” pickups, its output signal
may need to e padded to get the est
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 utton.
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 make 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
oth 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- and
graphic equalizer allows you to custom
tailor your tone. Each slider controls the
frequency indicated directly elow it and
offers a cut or oost of 10dB at various
frequencies from 40Hz to 16kHz
. MASTER LEVEL: Use this control
to set the output level of the amplifier.
This controls the signal level at the
Speaker Output jacks (#19), as well as
the Preamp Out jack (#17).
9. LIMIT: The amplifier employs
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
kicks in to keep 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 jack (#20). You may also use
this output (or the headphone jack, #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 jack. 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 ring the
control towards “10” the amount of
effect applied increases. (“5” is a 50/50
lend of dry signal and effects.)
13. HEADPHONES LEVEL: This con-
trol adjusts the signal level at the
Headphones jack (#14).
14. HEADPHONES: Plug a pair of
stereo headphones in here for private lis-
tening. The signal at this jack is post Gain
and post EQ. The level of the signal here
is determined y the setting of the
Headphones Level control (#13). Using
headphones does not disable the
speaker outputs. You may also use this
output (or the line out jack, #20) to run
a signal to a tuner.
15. POWER: This two-position switch
turns the amp on and off, “on” eing the
UP position. The switch lights up when
the amp is turned on.
The Front Panel:
BXH-220 BASS AMPLIFIER
4
INPUT GAIN CONTOUR LEVEL
MASTERINPUT EQUALIZATION
POWER
LINE OUT
LEVEL
EFFECTS
BLEND
HEADPHONES
LEVEL
LIMIT POST EQ
PRE EQ
ON–15dB
DECREASE
GAIN
INCREASE
GAIN
OK
40 100 225 625 1.6k 4k 8k 16k
1
3 6 9 11 14
2 4 5 8 10 12 13 157

16. 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.
17. PREAMP OUT: A pre-amplified
line-level signal may e tapped from this
jack for sending to an external amplifier,
powered monitor, recording console,
mixing oard or effects processor. This is
an un alanced, mono 1/4” jack.
1 . POWER AMP IN: A pre-amplified
line level signal may e sent directly into
the ass 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 (#17)
signal is not interrupted.
19. SPEAKERS: Use these jacks to con-
nect the amp to your speaker ca inet(s).
Use heavy-duty speaker ca les with
mono 1/4” plugs. These jacks are wired
in parallel. Don’t use ca inet com ina-
tions resulting in impedance loads elow
4 ohms. Use the chart elow to help
determine parallel loads. If in dou t, ask
your dealer.
Cab Imp. # Cabs Total Imp.
ohms 2 4 ohms
16 ohms 2 ohms
16 ohms 4 4 ohms
20. BALANCED LINE OUT: Use this
3-pin XLR jack to send a line level signal
to the house sound oard or mixing con-
sole. The level of the signal at this jack is
determined y the setting of the Line
Out Level control on the front panel
(#10). This signal is switcha le to e
either pre or post EQ through the front
panel Pre/Post switch(#11).
21. EFFECTS LOOP SEND: This
un alanced 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. EFFECTS LOOP RETURN: This
jack receives the signal from the output
jack of an external effects processor. Use
shielded ca les with mono 1/4” plugs for
connecting the Effects Loop.
The Rear Panel:
BXH-220 BASS AMPLIFIER
5
MODEL:
SERIAL:
LINE: V ~ Hz
WATTS: MAX
BXH-220
BXH22031U2
120 60
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.
19 20
16 17
22
21
18

AS NEEDED OUT
AS NEEDED IN
AS NEEDED
AS NEEDED
IN
IN
Some Suggested Settings:
Rock:
Jazz:
Country:
Funk:
6
BXH-220 BASS AMPLIFIER

System Block Diagram:
BXH-220 BASS AMPLIFIER
7
INPUT
POWER
AMP
-15dB PAD
GAIN
PREAMP
OUT
EFFECTS
SEND
PEAK
LED
8 BAND
GRAPHIC
ON / OFF
PRE
POST
EFFECTS
RETURN
LIMIT
LED
MASTER
HEADPHONE
LEVEL
POWER
AMP IN
SPEAKER
OUT
SPEAKER
OUT
HEAD-
PHONES
LINE OUT
LEVEL
BALANCED
LINE OUT
CONTOUR
EFFECTS
BLEND

Technical Specifications:
©1997 SLM ELECTRONICS • A DIVISION OF ST. LOUIS MUSIC, 1400 FERGUSON AVENUE, ST. LOUIS, MO 63133 47-589-51 • 07/97
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.
Maximum Input Signal Level Accepted 17 volts peak to peak (-15dB switch pressed in)
Input Impedance 500k ohms (-15dB switch out), 75k 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, 1.6kHz,
4kHz, 8kHz and 16kHz
Input Power Requirements 120VAC, 60Hz, 250VA
100/120VAC, 50/60Hz, 250VA
230VAC, 50/60Hz, 250VA
Size and Weight 7-1/4”H x 21”W x 12-1/2”D, 35 l s.
BXH-220 BASS AMPLIFIER