Markbass Classic 300 - Manual (Page 8)

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3.2 Classic 300 Rear Panel
LINE OUT
The balanced XLR (15) output allows you to connect your amplifier directly to a mixing console (either in live situations or in a recording studio) without the need of a DI box.
Simply connect a standard XLR cable from this output to the soundboard/mixing console, or a snake connected to the board/console. If the soundman/engineer needs more or
less signal from you, simply turn the front panel LINE OUT (8) control up or down as necessary.
GROUND LIFT
Occasionally when you’re playing live and using the LINE OUT (15), the soundman will detect a hum from your amp’s signal. This is almost always due to a grounding problem
related to your power source; you will likely eliminate this hum simply by flipping the GROUND LIFT (16) switch.
EFFECT SEND AND RETURN
If you use effect pedals or rack gear, you can route them through the SEND EFFECT (17) and RETURN EFFECT (18) jacks on the rear panel of the amp. The effects loop is
wired in parallel this means that if something happens to your effects chain (a battery dies or a cable gives out, for example) while you’re playing, you will not lose your main
signal. If desired, however, the effects loop can be easily modified by authorized service personnel to operate in series.
TUNER OUT
The TUNER OUT (19) is an unbalanced signal that can be sent to a tuner, allowing you to tune as you play without passing your signal through pedals, which can degrade the
quality of your signal. You can also use this output to send your signal on to another amp, or any kind of recording unit that doesn’t require a balanced signal.
PRE EQ / POST EQ
This SWITCH (20) determines whether the signal that leaves the XLR LINE OUT (15) is affected by your amplifier’s EQ settings or not. In most cases, you will find that sound
engineers prefer to receive a pre-EQ signal. Note that the line out signal includes whatever effects you’ve connected through the effects loop.
DISPLAY FUNCTION
This switch (21) determines what type of information is displayed on the LCD screen. In NORMAL position, a digital VU meter is shown. In TEST 1 position, the bias current of
the power tubes is shown. In TEST 2, the screen shows the tensions of the driver and power tubes.
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