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Channel 1
3. Input Jacks
The ¼-inch inputs on Channel 1 are optimized for stereo instruments such as key-
boards 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, ad-
just 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 au-
dio 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, ad-
just 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, ad-
just 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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