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User manual for MERUS™ MA12070 musical instrument bass
amplifier
DEMO_BASSAMP_60W_MA12070
User interface
2.2
Setting up the amplifier for use
1. Put the on/off switch (10) in the depressed position (off).
2. Set all the controls at 12'o clock. Set the volume control (8) to minimum.
3. Put the pad switch (2) in the depressed position (high sensitivity input).
4. Put the bright switch (4) in the depressed position (not bright).
5. Connect a speaker (4 Ω minimum) to the speaker output jack (11) via a 6.35 mm mono jack cable. Make sure
the jack cable is a speaker-grade cable.
6. Connect a +24 V DC/3 A regulated power supply to the DC power input barrel (12). Make sure it has a
positive-tip scheme (inner tip is positive, outer ring is negative).
7. Connect a bass instrument via a shielded 6.53 mm mono jack cable to the input jack (1).
8. Turn-on the amplifier by pressing the on/off switch (10). The red LED (10) should light up.
9. Turn up the volume control (8) to the desired level.
10. Turn the controls until the desired response and sound is achieved (see Table 2 for a detailed explanation of
functions).
11. Connect a mono or stereo AUX signal (e.g., from the telephone headphone output) via the AUX IN 3.5 mm
stereo jack (9) for playing along with or for rehearsing song material (this input is placed after the volume
control (8) so the AUX signal volume can be controlled from the AUX source).
12. In a live or direct recording situation, connect a three-pin shielded XLR cable from the DI OUT XLR connector
(13) to a mixing desk or sound card. This injects the amplifier's pre-amp signal with frequency
compensation. Press the ground lift switch (14) if ground-loop/noise problems occur.
13. Play!
User Manual
6 of 13
V 1.0
2020-05-28
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