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User manual for MERUS™ MA12070 musical instrument bass
amplifier
Board overview
DEMO_BASSAMP_60W_MA12070
1.1
Features and performance
The key features and performance of the MA12070 musical instrument bass amplifier are as follows:
One "classic tube sound" bass instrument channel
1 x 60 W at 4 Ω speaker output.
Powered by off-the-shelf regulated wall adapter (+24 V DC/3 A)
Unparalleled power efficiency – with very low power losses and cool operation
No external heatsink (full volume, bass instrument playing)
Dual 12AU7 triode class A pre-amp run directly on adapter voltage for genuine tube sound
Passive instrument input jack with -12 dB input pad switch for active instruments
Gain and volume controls for tube overdrive
Bright switch for "slap-bass" sound
Dynamic "breathe and feel" when fully dimmed
Classic three-band passive Baxandall tone control: treble, middle, bass
Stereo 3.5 mm AUX input for practicing/street accompaniment
XLR DI: frequency-compensated, true balanced output for live PA/mixing desk (phantom power safe)
XLR DI ground switch
Protection: power supply reverse polarity and hot-plug, thermal, DC and speaker short-circuit
Speaker jack output with low-cost LC-filter
DC barrel input jack
Low idle power consumption even with vacuum tube
Small dimensions: 185 mm x 60 mm x 30 mm
Table 1
Electrical specifications
Power input
Idle power consumption
Power input at 10 W
output
rms
Output power
Output load impedance
Instrument input sensitivity/impedance
AUX input sensitivity/impedance
Bass control range
Treble control range
Middle control range
DI output level
DI output frequency response (-3 dB)
User Manual
+18 V to +24 V, 3 A regulated, positive tip 2.1 mm, DC barrel
2.7 W at 24 V input
15.3 W at 24 V input
60 W
at 5 percent THD, 4 Ω 24 V input
rms
4 Ω to 16 Ω, 6.35 mm jack
25 mV/1 MΩ, 90 mV/65 kΩ, 6.35 mm mono
400 mV
/200 mV
, mono/stereo, 4.7 kΩ, 3.5 mm jack
rms
rms
±12 dB at 40 Hz
±14 dB at 4 kHz
11 dB at 380 Hz
True balanced: -6 dBm, true ground lift
55 Hz to 8 kHz, 6 dB/oct
3 of 13
V 1.0
2020-05-28
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