Table of Contents
Advertisement
User manual for MERUS™ MA12070 musical instrument bass
amplifier
DEMO_BASSAMP_60W_MA12070
User interface
2
User interface
2.1
User controls
1
Figure 3
User controls overview
Table 2
User controls description
1. INPUT: Instrument input jack
2. PAD: -12 dB input pad switch
3. GAIN: Gain control
4. BRIGHT: Bright switch
5. TREBLE: Treble tone control
User Manual
14
2
4
3
5
Front of PCB (left to right):
Connect a shielded ¼ in. mono jack cable from the instrument
to this jack. 1 MΩ/65 kΩ input impedance.
When using active instruments or instruments with a high
output level, use this switch for matching the input sensitivity
of the amplifier for a clean sound. 65 kΩ input impedance
when engaged.
Adjusts the signal amplitude from the first tube gain stage into
the second tube gain stage. Combined with the master volume
control (8) it is possible to overdrive the tube for genuine tube
distortion.
Boosts the higher treble harmonics of the instrument when
engaged. Works in conjunction with the gain control (3). Most
effective when the gain control is at its lower settings.
Adjusts the treble frequencies of the instrument. Passive
Baxandall type with the capability of both boosting and
cutting treble frequencies of approximately ±15 dB at 4 kHz.
Set to middle position yields a flat treble response.
13
12
6
7
4 of 13
11
9
10
8
V 1.0
2020-05-28
Advertisement
Table of Contents
