Vintage Revolution Acoustic Box II, Owner'S Manual

7

Channel 1 (Ch1) and Aux Input

Ch1 has a selectable medium/high input impedance . It is designed for pas-
sive transducers (eg. piezo or magnetic pickup) and it can handle up to 0 dBu 
without distortion. Use a  mono jack from the left side in proximity of the Ch1 to 
connect to your pickup.If you are properly connected, your signal strenght will 
be monitored via the Ch1 LED.

Level control and +10dB gain button.

The 

LEVEL

 knob controls the output signal of the Ch1. If you are tuning the  

Ch1’s equalizer or if you do not intend to use Ch2 keep the 

LEVEL

 of Ch2 to  

minimum. Ch1 offers 

+10dB

 gain boost to be used if the input signal is low.

Parametric high-pass filter  (HPF )

Ch1 is equipped with a 2nd order high-pass filter with cut off frequency tun-
able from 40 to 150Hz. For double bass, the high-pass filter remove the subhar-
monic “thump” generated by the plucked bass, which otherwise can drive 
ported bass speakers to over-excursion.

Parametric equalizer (EQ1)

Ch1 is equipped with a parametric equalizer designed to control the mids of 
your  passive pickup. It operates between 350Hz to 4KHz with correction of +/-
12dB.If  you use a piezo transducer, by attenuating at least 6dB the frequency 
around 1 o’clock  you will  be able to obtain a much more natural sound.

Impedance selector

Next to the Ch1 1/4” input you will find a 

Med (1Meg)/High impedance   

(8.2 Meg)

 selector which will match the impedance of your pickup.

Aux input

Acoustic Box 

II

 is equiped with an independent 

Aux

Input

. You can use it  

to connect an external source such as a metronome/ipad/phone/looper 
e.t.c. for playback, practice or performance purposes. In conjunction with the 
Aux stereo 

Headphones

 output it can be used for linear on stage monitoring.

Channel 1