Crate Amplifiers Stereo Amplifier BT220 User Manual

BT220  
BASS AMPLIFIER  
USER’S GUIDE  
Download from Www.Somanuals.com. All Manuals Search And Download.  
BT220 Bass Amplifier  
Table Of Contents:  
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . .4,5  
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 MOIS-  
TURE. 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  
LA  
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.  
ELECTRICAS, NO PERMITA QUE ESTE APARATO QUEDE EXPUESTO  
A
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.  
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 PRO-  
TECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME.  
EXPLANATION OF GRAPHICAL SYMBOLS:  
EXPLICACION DE SIMBOLOS GRAFICOS:  
EXPLICATION DES SYMBÔLES GRAPHIQUES:  
"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"  
"DANGEROUS VOLTAGE"  
“VOLTAJE PELIGROSO”  
"DANGER HAUTE TENSION"  
=
=
2
Download from Www.Somanuals.com. All Manuals Search And Download.  
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
Download from Www.Somanuals.com. All Manuals Search And Download.  
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
Download from Www.Somanuals.com. All Manuals Search And Download.  
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
Download from Www.Somanuals.com. All Manuals Search And Download.