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BT220
Bass Amplifier
4
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.\
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The Front Panel: