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Input Channels
2. Input clip LED
The input clip LED located near the Power/Status LED, has been designed to monitor Channels 1-3 for clipping. It
will turn on when the input signal from an audio source is too hot (or the gain is set too high). Adjust the channels
individually while playing until the LED stops indicating clipping (it's okay if the LED blinks briefly).
Channel 1
3. Input Jacks
The ¼-inch inputs on Channel 1 are optimized for stereo instruments such as keyboards and synths but mono
sources can be also be used (using the left input sums the stereo audio signals properly).
Note: When using a stereo source with a single Block amp the input will properly sum the stereo signal.
4. Gain Control
The level for channel 1 is adjusted using the Channel 1 Gain control. If the level is too hot, the Input Channel 1-3
Clip LED (next to the Power/Status LED) will illuminate. If this occurs, adjust this control until the LED stops clipping
or clips very briefly when playing hard.
Note: Boosting the tone controls also affect the level (especially the bass frequencies).
5. Tone Controls
The tone controls, Bass and Treble, cover the entire audio spectrum and can help tailor your sound accordingly.
Each control can boost or cut with a 15 dB range of adjustment, the center position denotes a 0 dB cut/boost.
Channel 2
6. Input Jacks
A microphone can be connected to Channel 2 using the XLR jack, for a Line-Level mono audio source, use the
¼-inch jack. it's not recommended to use both inputs simultaneously, use only one input at a time.
7. Gain Control
The level for channel 2 is adjusted using the Channel 2 Gain control. If the level is too hot, the Input Channel 1-3
Clip LED (next to the Power/Status LED) will illuminate. If this occurs, adjust this control until the LED stops clipping
or clips very briefly when playing hard.
Note: Boosting the tone controls also affect the level (especially the bass frequencies).
8. Tone Controls
The tone controls, Bass and Treble, cover the entire audio spectrum and can help tailor your sound accordingly.
Each control can boost or cut with a 15 dB range of adjustment, the center position denotes a 0 dB cut/boost.
Channel 3
9. Input Jacks
Channel 3's input is optimized for external sources such as digital media players, CD players and tape decks. The
¼-inch and 1/8-inch stereo jacks are connected in parallel and should not be used simultaneously. It is suggested to
use only one input, at a time, for best operation.
Note: Channel 3 audio does NOT get channeled through to the Line Out .
10. Gain Control
The level for channel 3 is adjusted using the Channel 3 Gain control. If the level is too hot, the Input Channel 1-3
Clip LED (next to the Power/Status LED) will illuminate. If this occurs, adjust this control until the LED stops clipping
or clips very briefly when playing hard.
Channel 4
11. Input Jack
Channel 4's Line level input has been added as an extra channel for monitoring purposes, the signal does not mix in
with the main bus and thus the Line Out nor Link Out are affected by it.
12. Gain Control
The level for channel 4 is adjusted using the Channel 4 Gain control.
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