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User Tip: When starting out, center all the tone controls and adjust while playing until the desired
tone is achieved. 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.
Low Expander Control
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The Low Expander shapes the tone of the bass by extending the low frequency, reducing the
mid frequencies (around 550 Hz) and taming the ultra highs.
Master Volume Control
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The Master volume adjusts the overall signal level of the amplifier; it is your master
"loudness" control.
Mute Switch / Tuner Out Jack
The Mute button cuts the audio signal to the speaker/s without affecting the Tuner output.
Phones Jack
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The Phone jack has been provided for connecting headphones which allows practice
or recording without making any audible sound through the speakers. When you plug
headphones in the Big Block, the amplifier is disconnected from the speaker/s.
Note: When the Phones jack is used, the XLR Line Out, Tuner jack and Effects Send jack are
active and still function.
EFX Send & EFX Return
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The EFX Send (Pre-Amp Out) can be used as an effects send or for sending signal to
another power amp. The EFX Return (Power Amp Input jack) goes directly to the Big Block's
power amplifier, bypassing the pre-amp. The EFX Return (Power Amp Input) allows audio
signals from another pre-amp go directly to the power amp bypassing the Big Block's internal
preamp, including the tone stack.
Note: The selectable Limiter is applied directly to the signals entering the amplifier helping
prevent damage to the amplifier and/or speakers.
Note: The output signal of the Effects Send (Pre-Amp Out) is set at 0 VU. When using the
Effects Send (Pre-Amp Out) as an effects loop, it's recommvended to use professional-grade
signal processing equipment (pedal effects might not have enough headroom).
Line Out XLR
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The Big Block is equipped with a balanced D.I./Line output. You can select a direct, clean
signal (Pre-EQ setting which delivers the sound directly to the Balanced Line Out) or tap
the signal after the pre-amp (Post-EQ). Both signals are routed to the Balanced Line Out
before the Master volume. A Ground Lift (lifts Pin 1 of the XLR) is also provided to help when
routing signals directly to other equipment or mixing consoles.
Note: In the Lift position, Pin 1 of the XLR is disconnected which might help reduce ground
loop hum when routing signals directly to other equipment or mixing consoles. If ground loop
hum is not present, you may get superior shielding from outside noise sources with the button
in the GND setting. In most cases, it is recommended to have the switch set to GND.
User Tip: When using the XLR Line out for recording direct-to-computer, we would recommend
you insert a suitable device between the amp and computer such as A.R.T.'s TubeMP with
USB for extra gain control and USB conversion.
Speaker Output
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The Speakon Speaker Output connector allows you to connect an external 8-ohm (min)
speaker cabinet. Using an external speaker DOES NOT defeat the internal speaker!
Tweeter In/Out Switch
15
The Tweeter switch disconnects the internal tweeter which provides a softer and
more classic bass amplifier tone, for more brightness set the switch to the in position.
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