Crate Amplifiers BT220H Musical Instrument Amplifier User Manual

BT220H
BASS AMPLIFIER
USER’S GUIDE
BT220H
Bass Amplifier
Table Of Contents:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Some Suggested Settings . . . . . . . . . . . . . . . . . . . . . .6
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . .7
Technical Specifications . . . . . . . . . . . . . . . .back cover
CAUTION
PRECAUCION
ATTENTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
RIESGO DE CORRIENTAZO
NO ABRA
RISQUE D'ELECTROCUTION
NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE. TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT
REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
PRECAUCION: PARA REDUCIR EL RIESGO DE INCENDIOS O DESCARGAS
ELECTRICAS, NO PERMITA QUE ESTE APARATO QUEDE EXPUESTO A LA
LLUVIA O LA HUMEDAD. PARA DISMINUOIR EL RIESGO DE CORRIENTAZO.
NO ABRA LA CUBIERTA. NO HAY PIEZAS ADENTRO QUE EL USARIO PUEDO
REPARAR DEJE TODO MANTENIMIENTO A LOS TECHNICOS CALIFICADOS.
ATTENTION: PROTÉGEZ CET APPAREIL DE LA PLUIE ET DE L'HUMIDITÉ
AFIN D'ÉVITER TOUT RISQUE D'INCENDIE OU D'ÉLECTROCUTION. 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.
IMPORTANT SAFETY INSTRUCTIONS
• READ, FOLLOW, HEED, AND KEEP ALL INSTRUCTIONS AND WARNINGS.
• DO NOT OPERATE NEAR ANY HEAT SOURCE AND DO NOT BLOCK ANY VENTILATION OPENINGS ON THIS APPARATUS. FOR
•
•
•
•
•
•
•
•
•
PROPER OPERATION, THIS UNIT REQUIRES 3” (75mm) OF WELL VENTILATED SPACE AROUND HEATSINKS AND OTHER AIR
FLOW PROVISIONS IN THE CABINET.
DO NOT USE THIS APPARATUS NEAR SPLASHING, FALLING, SPRAYING, OR STANDING LIQUIDS.
CLEAN ONLY WITH LINT-FREE DAMP CLOTH AND DO NOT USE CLEANING AGENTS.
ONLY CONNECT POWER CORD TO A POLARIZED, SAFETY GROUNDED OUTLET WIRED TO CURRENT ELECTRICAL CODES AND
COMPATIBLE WITH VOLTAGE, POWER, AND FREQUENCY REQUIREMENTS STATED ON THE REAR PANEL OF THE APPARATUS.
PROTECT THE POWER CORD FROM DAMAGE DUE TO BEING WALKED ON, PINCHED, OR STRAINED.
UNPLUG THE APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG PERIODS OF TIME.
ONLY USE ATTACHMENTS, ACCESSORIES, STANDS, OR BRACKETS SPECIFIED BY THE MANUFACTURER FOR
SAFE OPERATION AND TO AVOID INJURY.
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE..
SERVICE MUST BE PERFORMED BY QUALIFIED PERSONNEL.
OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND
PRESSURE LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME.
EXPLANATION OF GRAPHICAL SYMBOLS:
EXPLICACION DE SIMBOLOS GRAFICOS:
EXPLICATION DES SYMBÔLES GRAPHIQUES:
2
"DANGEROUS VOLTAGE"
=
“VOLTAJE PELIGROSO”
"DANGER HAUTE TENSION"
"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"
=
“ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.”
"REFERREZ-VOUS AU MANUAL D'UTILISATION"
BT220H
Bass Amplifier
Congratulations!
You are now the proud owner of the Crate BT220H Bass Amplifier. The BT220H 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 the front panel, 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 BT220H 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 Crate.
Declaration Of Conformity
#30, Effective 01-01-2001
Manufacturer’s Name:
Production Facility:
Production Facility:
Shipping Facility:
Office 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
Product Type:
Audio Amplifier
Complies with the following Standards:
Safety:
EN60065, E60065, C22.2, UL6500 and/or UL813
EMC:
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
BT220H
Bass Amplifier
The Front Panel:
1
2
3 4
5
6
7
8
9
1. ELECTRONIC TUNER: This active electronic tuner is on whenever the amplifier is turned on, allowing you constant, “realtime” tuning. The tuner is fully chromatic – use the flat and sharp indicators until the LED between them illuminates, indicating proper tuning.
2. INPUT: Use this 1/4” jack to connect your bass to the amplifier by means of a shielded instrument cable.
3. -15dB/0dB: Use this switch to match the output signal level of your instrument to the amplifier. If your instrument 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).
4. MUTE: This switch, when depressed, interrupts the signal prior to the power amplifier, allowing you to tune your instrument in silence.
5. 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 BT220H employs an internal noise gate on the Distortion channel to keep residual noise to a minimum. The
Clean channel’s Level control (#9) must be turned up above “0” in order for the noise gate to trigger properly. The Gain control (#5) and input signal level also affect the noise gate.
6. 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.
7. LEVEL: Use this control to adjust the output level of the Distortion channel.
8. 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 illuminates when the
Distortion channel is selected. NOTE: When using the footswitch (#27): when this switch is depressed, the footswitch switches between the Distortion channel and the Clean channel; when this button 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.
9. LEVEL: Use this control to adjust the output level of the Clean channel, and as part of the Octave level control (see #14).
10. LOW: Use this control to adjust the low frequency output of the Clean channel.
11. LOW MID: Use this control to adjust the lower-midrange frequency output of the Clean channel.
12. HIGH MID: Use this control to adjust the upper-midrange frequency output of the Clean channel.
13. HIGH: Use this control to adjust the high frequency output of the Clean channel.
14. OCTAVE: The BT220H 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 (#9) to adjust the level of the octave signal.
15. MASTER: Use this control to adjust the overall output level of the amplifier.
16. LIMIT LED: This LED illuminates when the internal limiting circuit is active. Occasional flashing during playing is normal.
If the Limit LED remains illuminated, reduce the output level of the amplifier until the LED flashes.
17. 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 (#15). 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.
18. HEADPHONES: Use this jack to listen to the amplifier through a pair of stereo headphones. The external speakers are
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.
19. POWER: Use this switch to turn the amplifier on and off. The adjacent LED illuminates when the amplifier is turned on.
4
BT220H
10
11
12
13
14
Bass Amplifier
15
16
17
18
19
The Rear Panel:
20. AC LINE CORD (not shown): The
grounded power cord should only be
plugged into a grounded power outlet 21
that meets all applicable electrical
codes and is compatible with the volt- 22
PREAMP
POWER AMP
OUT
IN
age, power, and frequency requireBALANCED LINE OUT
ments stated on the rear panel. Do not
PRE
POST
attempt to defeat the safety ground
EFFECTS LOOP
connection.
21. PREAMP OUT: Use this jack to 23
send a line level signal to an external
GND
amplifier, mixing board, recording con- 24
GND LIFT
VOLUME
SEND
RETURN
sole, or external effects device.
22. POWER AMP IN: Use this jack to
connect a line level signal from an external preamp or external effects device
into the power amp. The internal preamp is deactivated when this jack is
used.
CHANNEL /
OCTAVE
23. EFFECTS LOOP SEND: Use this
FOOTSWITCH
jack to connect an external signal
processor to the amplifier by means of a
25
26
27 28 29 30
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. EXTERNAL SPEAKERS: Use these parallel 1/4” jacks to connect the amplifier to your speaker cabinet(s). The minimum acceptable impedance for your speaker cabinet(s) is four ohms.
26. BALANCED LINE OUT: Use this XLR jack to send a balanced line level signal to an external power amplifier, mixing
board, or recording console.
27. FOOTSWITCH: Connect a two-button footswitch (such as the Crate CFS-2) here for remote control of the channel
selection/“blend” (see #8) and octave on/off. (When the Channel Switch [#8] 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.)
28. GROUND LIFT: This switch, when depressed, lifts the ground connection at the Balanced Line Out jack (#26). This may
help reduce hum in the Balanced Line Out signal if necessary.
29. PRE/POST: Use this switch to determine whether the Balanced Line Out signal is Post-EQ (switch depressed) or PreEQ (switch in the out position).
30. VOLUME: Use this control to adjust the signal level at the Balanced Line Out jack (#26).
5
BT220H
Bass Amplifier
Suggested Starting Settings:
Rock:
OUT
* *
Jazz:
OUT
* *
Country:
OUT
* *
Funk:
OUT
* *
Solo Fuzz:
IN
* *
Super Fat Fuzz:
IN
*
6
BT220H
Bass Amplifier
System Block Diagram:
OCTAVE
LEVEL
TUNER
FOOT
SWITCH
A BC D EF G
SWITCHING
CIRCUITRY
BUFFER
EQ
INPUT
LEVEL
-15dB PAD
LOW
LOW HIGH HIGH
MID MID
CHANNEL
SWITCH
NOISE
GATE
SHAPE
DISTORTION
LEVEL
GAIN
EFFECTS LOOP
RETURN
SEND
EFFECTS
BLEND
MUTE
MASTER
CD
INPUT
GND/
GND
LIFT
LIMIT
PRE
BALANCED
LINE OUT
BALANCED
LINE OUT
VOLUME
EXTERNAL
SPEAKER
POST
POWER
AMP
EXTERNAL
SPEAKER
POWER
AMP IN
ATTENUATOR
PREAMP
OUT
HEAD
PHONES
7
BT220H
Bass Amplifier
BT220H Technical Specifications:
Output Power Rating
Gain
220W RMS 2% THD @ 4Ω, 120 VAC
Distortion Channel
106dB
Clean Channel
61dB
CD Inputs
36dB
Tone Range
Low
20dB @ 50Hz
Lo Mid
24dB @ 150Hz
Hi Mid
18dB @ 1kHz
High
34dB @ 10kHz
Signal to Noise Ratio
65dB below full power, tones flat, gain and level @ “10”
Input Impedance
220k ohms
Maximum Input Signal Level Accepted
15 volts peak-to-peak
Balanced Line Out Jack
2 volts peak-to-peak @ full rated power w/600 ohm load
Input Power Requirements
120 VAC, 60Hz, 250VA
100/115VAC, 50/60Hz, 250VA
230VAC, 50/60Hz, 250VA
Size
8-1/2” H x 24-1/2” W x 13-3/4” D
Weight
38 lbs
Specifications subject to change without notice
www.crateamps.com
©2003 ST. LOUIS MUSIC, 1400 FERGUSON, ST. LOUIS, MO. 63133
47-462-01 • 111703