Vintage Revolution Acoustic Box II, Owner'S Manual

12

Using only piezo

A. Increase the 

LEVEL

 of Ch1 untill you have a good audible volume.

B. Set the 

EQ1

 knob to 15 o’clock and search with the corresponding frequen-

cy  knob for the most unpleasant frequency. If you are using a piezo it should 
be between 12 and 15 o’clock

. 

Once you are there, use the 

EQ1

 knob to 

remove it untill the sound is more natural. In most cases placing the 

EQ1

 knob 

at 9 o’clock will do the job. 

C. Keep the Level of Ch2 to minimum since you will not use this channel. 

D. Adjust  your Low - Mid - High from the three band parametric EQ control of 
the blended signal to bring the sound to the desired shape.

Handling acoustic feedback tips.

Audio feedback is a special kind of positive feedback which occurs when a 
sound loop exists between your mic and the AMP or PA speaker.

The two major parameters that determine the amount of feedback are: 

A. the distance from your cabinet/monitor and 

B. the volume of your mic. 

There are two main frequencies that are most sensitive to feedback. The first 
area is the LOW-LOW MID (100Hz-250Hz) and the second area is the MID area 
(400Hz-1.5KHz). For the LOW-LOW MID area the 

NOTCH

 filter is a perfect solu-

tion. For the MID area you can use the low pass shelving button (

)and the 

EQ2

 knob.

By changing the phase of the blended channel (

ALL

 switch) you virtually 

move your instrument in to another physical location and therefore you 
change the feedback settings.

On stage In-ear Monitoring

You can use your Abox II auxiliary input and headphones output for on stage 
in-ear monitoring. 

Ask the sound engineer to send a mix to your Auxiliary input and use the Head-
phones out for your own monitoring. The signal on 

XLR L+R 

and 

AMP

 outputs is 

clean (will not include the signal of the Auxiliary input).

Backtrack Rehearsal

You can use your Abox II auxiliary input and headphones for backtrack re-
hearsal. Connect your auxiliary input min jack to your phone/Ipad/Mp3 player 
and  play our track. Adjust via XLR L+R the level your instrument and enjoy the 
practice.

Piezo, Feedback, In-ear