3
DIRECT INTERFACE (DI)
This is a built-in, balanced Direct Interface that sends a buffered, unprocessed signal to an external mixer.
GROUND LIFT: This button is provided to prevent a ground loop that may result in "hum" noise. When
depressed (IN position), Ground Lift is engaged.
ACTIVE/PASSIVE PICKUP Inputs
These 1/4" inputs are included so you can choose the appropriate setting for your instrument. The gain
structure of the amplifier is modified to accommodate the outputs of different pickup configurations.
GAIN
This knob controls input level of the instrument.
TT BOOST SWITCH
This TransTube
®
crunch circuit is designed so that the volume of the amp will not change when the boost
is switched on, but the distortion level will increase depending on the level of the GAIN knob. For best
results, first set the distortion amount by adjusting the GAIN. Next, set the desired volume using the VOL-
UME knob. At this point, the clean volume will match if the TT BOOST is turned off.
PUNCH
This switch engages a boost of 6dB at 100Hz, which greatly enhances the low-end presence of the bass
guitar.
BASS
This knob provides a shelving tone control for low frequencies and provides cut/boost of +/-15 dB. The
center point is flat. The center frequency is 50 Hz. -3 dB shelf corner frequency is 100Hz.
MIDDLE
This knob provides a peaking tone control for Mid frequencies and cut/boost of +/-15dB. The center point
is flat.
MID SHIFT
This switch controls the center frequency of the MIDDLE knob. When the switch is OUT, the middle fre-
quency is 600Hz. The middle frequency is 250Hz when the switch is pushed IN.
TREBLE
This knob provides a shelving tone control for high frequencies and cut/boost of +/-15dB. The center
point is flat and the frequency is 8 KHz. -3dB; the shelf corner frequency is 5 KHz.
BRIGHT SWITCH
This button provides a 10 dB boost to frequencies above 1KHz. To activate, depress the switch to its “IN”
position.
PSYCHO-ACOUSTICS EFFECT SWITCH
The human ear does not hear low frequencies as well as higher frequencies. This means that as bass
goes lower, more and more power is required. The MAX
®
Psycho-Acoustics effect solves this problem by
identifying extremely low notes, generating harmonics based on the notes, and then blending the har-
monics with the original note, making the lows seem louder and tighter without eating up excess power
amp headroom.
Front Panel MAX
®
115 and 112
1
2
3
4
5
6
7
8
9
10
1
7
8
15
9
4
2
11
5
6
12
14
10
11
16
13
