3. Limiter Pushbutton
When the Limiter pushbutton is pressed in, the Small Block's Limiter will be enabled
preventing the power amp from clipping.
4. Gain Control
The Small Block Gain control allows you to set the level of the signal before it's sent to the
tone controls. This controls the tonal 'sensitivity' or 'definition' of the amplifier. Higher Gain
settings will give more 'growl' to your bass.
5. Tone Controls
A wide-range of sonic adjustment is achieved by using the four overlapping active tone
controls. These tone controls have a range of ±15 dB covering the entire audio spectrum.
The center position of each control denotes a neutral or nominal setting. The Bass control
adjusts the level of the low frequency; Low Mid, the next frequency range up; the Hi Mid
covers a higher frequency range and the Treble regulates the upper frequency range.
User Tip: When starting out, it's a good idea to center all tone controls. Adjust these controls
while playing until you achieve the desired tone. Keep in mind that all tone and EQ circuits are
gain-related, which means it may be necessary to re-adjust the Gain control once the desired
tone is achieved. This will help you to retain the amount of clarity or 'growl' you desire.
6. Low Expander Control
The low expander shapes the tone of the bass by contouring the gain throughout the mid
frequencies around 400 Hz while expanding the low frequency. Re-shaping the frequency
response in this manner provides an expanded tonal palette.
7. Master Volume Control
Increase or decrease signal going to the amplifier's final stage, this does not affect the any
signal such as the EFX send or RTN, head phones etc.
8. Mute Pushbutton
As an aid to tuning your bass and practicing silently, the Mute function disengages the
preamp signal from all outputs except the Tuner and Phones jacks. When the Mute function
is enabled the power/status lamp changes color to red.
9. Tuner Out Jack
Connect your instrument tuner here using a standard shielded (e.g. guitar) cable.
10. Phones Jack
Connect headphones here for practicing or recording. When you plug phones in, you mute the
amplifier's speakers; however the output sent to the XLR Line Out, Tuner jack and EFX Send
jack will be disabled.
11. Effects Send and Return ¼ -inch Jacks
External effects processors are provided with a balanced post-EQ signal from the Effect Send
jack. The balanced Return jack is used to return effects (processed audio signals) back into
the Small Block 500H. The EFX Return can also be used as an auxiliary input for mixing in a
secondary source of audio such as pre-recorded music.
User Tip: The Effects Send jack can also be used as additional line out for sending signals to
another power amplifier. The output of this jack is not muted when the Mute switch is enabled.
12. Line Out EQ Switch
This feature routes the preamp signal destined for the balanced Line Out XLR either through the
amp's tone control and Scoop circuits, or around them. Depress the button (Post-EQ setting) to
have the same sound as your amp going to the PA or recording mixer, or leave it in the out position
(Pre-EQ setting) to send the instrument's original, non-EQ'd signal to the board.
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