feedback caused by the resonance of the body of the instrument.
A NOTCH filter removes a narrow band of frequencies from the response of the amplifier. If this band of
frequencies is narrow enough it will not be missed from the wide band of frequency response of the unit. This
band or NOTCH, is then made tuneable so that it can be adjusted to the resonant frequency of the body of the
instrument, thus reducing the amplification at that particular frequency and eliminating the feedback.
If feedback becomes a problem while playing then switch the NOTCH ‘IN’ and adjust the control for the best
position to eliminate the feedback. If feedback is still a problem then the only solution is either move further
away from the amplifier or reduce the overall level of volume you are using.
Digital Reverb
The DIGITAL REVERB built into the ACOUSTIC CUBE has a LEVEL control and two switches for selecting the
type and length of reverb.
Turning the LEVEL control up adds reverb to the signal and providing the GAIN control has been set correctly
there will be plenty of reverb available on this control.
The switch on the left of the level control selects the type of reverb. In its ‘up’ position PLATE reverb is selected,
this is a nice bright type of reverb with plenty of presence in its sound quality. With the switch in its ‘down’
position ROOM reverb is selected which is a more mellow but rich, full type of reverb. Both of these have been
chosen as they are an ideal compliment to acoustic guitar.
The switch on the right of the level control sets the length of the selected type of reverb. In its ‘up’ position it
selects a long decay time and in its ‘down’ position a short decay time. These decay times are as follows for the
two choices of reverb type:
Reverb
Short Decay
Long Decay
Plate
1.2 sec
3.2 sec
Room
1.5 sec
3.5 sec
Level Control
The LEVEL control is for setting the required output stage volume from the amplifier.
The Shape Switch
The SHAPE facility is actually a pre determined EQ that can be switched in to add an instant ‘sparkle’ to the
sound that is appropriate to both rhythm playing and fingerpicking styles.
When switched ‘in’ the SHAPE adds a top boost, a mid cut and a bass boost simultaneously to provide an
instant full and rich character to the guitars tone.
POWER CUBE
Instrument Input
This input is for use either directly from an instruments pick up or for use where any of the TRACE ACOUSTIC
foot pedal units are being used in front of the POWER CUBE.
The input impedance of the INSTRUMENT INPUT is the same as on the ACOUSTIC CUBE and is suitable for
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