Vintage Revolution Acoustic Box II, Owner'S Manual

11

Acoustic Box in practice

This section will guide you to do your sound check in a few minutes and obtain  
the desired sound result with the preamp.

LEVELS and OUTPUTS 

To obtain the best sound quality keep the levels knobs of Ch1 and Ch2 as high  
as possible without distortion. Level monitor on the display provides an indica-
tion of the channel mix (Ch1+Ch2) signal strenght. The levels are properly set if 
the level monitor display is within the green range as indicated in the picture 
below.   The empty square char is indicating 0dBm on the maximulm level set 
for XLR outputs.  If the levels are too low you might want to add +10dB gain 
on the channel or both channels. Vice-versa, 

if you experience distortion 

reduce the gain by selecting lower gain (d10dB).

Adjust output knobs only 

after

 you have a good range of the input levels.

Using microphone and piezo

This section contains some fine tuning tips for those who use condenser mic  
(such as DPA 4099, ATM350 , AKGC414, Neumann U87, etc..) or dynamic mic  
(SHURE SM57, SM58, etc..) in combination with piezo pickup.

A. Make sure that the Mic/Line switch is set to Mic and enable the 48V (Phan-
tom Power) if needed using the 

Pref

. button

. 

Set the level of Ch2 on  

minimum.

Increase the 

LEVEL

 of  Ch1 until you have a good audible volume.

B. Set the 

EQ1

 knob to 3 o’clock and search with the corresponding frequency 

knob for the most unpleasant frequency. If you are using a piezo it should be 
between 12  and 3 o’clock. 

Once you are there, use the 

EQ1

 knob to remove it untill the sound is more  

natural. In most of the cases placing the 

EQ1

 knob at 9 o’clock will do the job.

C. Before adding the mic signal, unpress the 

NOTCH

 filter, the low pass filter,  

the 

High Pass

 filter and the 

Phase

 buttons on Ch2 . 

D. Gently increase the 

LEVEL

 of channel 2 until the level of the second chan-

nel is adding the bottom end. Use the 

Phase

 button Ch2 to adjust the phase 

shift between the two channels if required.

E. If you experience low frequency resonance/feedback turn on the 

NOTCH

and tune it untill the low frequency resononance/feedback is removed. 

F. If you experience feedback use the Low Pass Sheving Filter 

to gently    

attenuate mid and high tones. By reducing 6dB of the frequency spectrum  

above 1KHz you will be less prone to feedback. 

G. Use  the High Pass Filter 

 to remove the booming effect of the micro-

phone due to proximity with your insturment.

H. Adjust your 

Low - Mid - High

 from the three band parametric EQ control  

of the blended signal to bring the sound to the desired shape.

Using AKG C411 and piezo 

A. Increase the 

LEVEL

 of Ch1 until you have a good audible volume.

B. Set the upper 

EQ1

 knob to 15 o’clock and search with the corresponding 

frequency  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 until the sound is more natural. In most cases placing the 

EQ1

knob at 9 o’clock will do the job. 

C. Before adding the AKG C411 signal from Ch2, deactivate the 

NOTCH

 and  

activate the low pass 

 . 

D. Place the 

EQ2

 knob to 100Hz and the corresponding 

MID

 knob to 15 o’ 

clock.   Increase the 

LEVEL

 untill you have enough low end from the Ch2.

E. Adjust your 

Low - Mid - High

 from the three band parametric EQ control of 

the blended signal to bring the sound to the desired shape.

Lvl ÒÒÒÒ

ÒÒÒÒ

Weak

Good

Levels - Outputs - Sources