BT220H
BASS AMPLIFIER
USER’S GUIDE
Download from Www.Somanuals.com. All Manuals Search And Download.
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 head-
phones, 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 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.
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, “real-
time” tuning. The tuner is fully chromatic – use the flat and sharp indicators until the LED between them illuminates, indi-
cating 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 stan-
dard 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 instru-
ment 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 con-
trol (#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 switch-
es 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
Download from Www.Somanuals.com. All Manuals Search And Download.
BT220H Bass Amplifier
10
11
12
13
14
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
that meets all applicable electrical
codes and is compatible with the volt-
age, power, and frequency require-
ments stated on the rear panel. Do not
attempt to defeat the safety ground
connection.
21
22
PREAMP
OUT
POWER AMP
IN
BALANCED LINE OUT
PRE
POST
EFFECTS LOOP
21. PREAMP OUT: Use this jack to
send a line level signal to an external
amplifier, mixing board, recording con-
sole, or external effects device.
23
24
GND
GND LIFT
SEND
RETURN
VOLUME
22. POWER AMP IN: Use this jack to
connect a line level signal from an exter-
nal preamp or external effects device
into the power amp. The internal pre-
amp is deactivated when this jack is
used.
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.
CHANNEL /
OCTAVE
FOOTSWITCH
25
26
27 28 29 30
24. EFFECTS LOOP RETURN: Use this jack to connect an external signal processor to the amplifier by means of a shield-
ed 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 mini-
mum 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 Pre-
EQ (switch in the out position).
30. VOLUME: Use this control to adjust the signal level at the Balanced Line Out jack (#26).
5
Download from Www.Somanuals.com. All Manuals Search And Download.
BT220H Bass Amplifier
Suggested Starting Settings:
Rock:
OUT
OUT
OUT
OUT
IN
* *
* *
* *
* *
* *
*
Jazz:
Country:
Funk:
Solo Fuzz:
Super Fat Fuzz:
IN
6
Download from Www.Somanuals.com. All Manuals Search And Download.
BT220H Bass Amplifier
System Block Diagram:
OCTAVE
LEVEL
TUNER
FOOT
SWITCH
SWITCHING
CIRCUITRY
A BC D EF G
BUFFER
EQ
INPUT
CHANNEL
SWITCH
LEVEL
-15dB PAD
LOW LOW HIGH HIGH
MID
MID
NOISE
GATE
SHAPE
DISTORTION
LEVEL
GAIN
EFFECTS LOOP
SEND RETURN
EFFECTS
BLEND
MUTE
MASTER
CD
INPUT
LIMIT
PRE
BALANCED
LINE OUT
EXTERNAL
SPEAKER
POST
BALANCED
LINE OUT
VOLUME
POWER
GND/
GND
LIFT
AMP
EXTERNAL
SPEAKER
POWER
AMP IN
ATTENUATOR
HEAD
PHONES
PREAMP
OUT
7
Download from Www.Somanuals.com. All Manuals Search And Download.
BT220H Bass Amplifier
BT220H Technical Specifications:
Output Power Rating
Gain
220W RMS 2% THD @ 4Ω, 120 VAC
Distortion Channel
Clean Channel
CD Inputs
106dB
61dB
36dB
Tone Range
Low
Lo Mid
Hi Mid
High
20dB @ 50Hz
24dB @ 150Hz
18dB @ 1kHz
34dB @ 10kHz
Signal to Noise Ratio
Input Impedance
65dB below full power, tones flat, gain and level @ “10”
220k ohms
Maximum Input Signal Level Accepted
Balanced Line Out Jack
15 volts peak-to-peak
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
38 lbs
Weight
Specifications subject to change without notice
©2003 ST. LOUIS MUSIC, 1400 FERGUSON, ST. LOUIS, MO. 63133
47-462-01 • 111703
Download from Www.Somanuals.com. All Manuals Search And Download.
|