Markbass Classic 300 User Manual
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3. CLASSIC 300 PRODUCT OVERVIEW
The Classic 300 is a high-quality all-tube bass amplifier, which delivers 300W of power into a 4 or 2 ohm cabinet or 175W into an 8 ohm cabinet.
3.1 Classic 300 Front Panel
INPUT
The input jack (1) can be used for both passive and active basses.
GAIN and MASTER
There are two knobs on the front panel of the Classic 300 that control the volume of your bass. The GAIN (2) control determines how much signal is passed through the preamp
stage of the unit, which includes the preamp tubes, the equalization circuits and the effects loop. The MASTER (9) volume regulates how much output comes out of the power
amp into your cabinet/s.
If playing through the amp causes the red CLIP (3) light to turn on at all, you should turn down the GAIN (2) control to avoid distortion.
When you first plug into the amp, start with the GAIN (2) and MASTER (9) controls set at their lowest levels, in other words turned all the way counter-clockwise. Then, turn
your instrument’s volume up to its full level and play as hard as you do in your most aggressive moments, and turn up the GAIN (2) control until the red light starts illuminating.
Next, back off on the GAIN (2) just enough so that the light stays off as you play. This method will result in the optimal gain setting for the bass you’re playing. Different basses
have different output levels, mostly depending on their pickups—and in the case of active basses, the instrument’s onboard preamp and EQ settings.
Once you’ve set the GAIN (2) level, use your MASTER (9) knob to control the volume of your bass. For more distorted tones at the same volume, turn up the GAIN (2) knob and
turn down the MASTER (9).
LINE OUT
This LINE OUT (8) knob controls the volume level of the rear XLR LINE OUT (15), which is connected to the mixing console in live or studio situations.
BIAS CONTROL
When this button (11) is pressed the power tubes work in HIGH FIDELITY mode. In the "out" position, the power tubes work in LONG LIFE mode. For more details, please read
the Microcontrolled Amp Management System chapter on page 9.
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