Table of Contents
Advertisement
Levels - Outputs - Sources
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 (disable +10dB).
Weak
ÒÒÒÒÒÒÒÒ
Lvl
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.
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.
Good
button.
Set the level of Ch2 on
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
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
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.
11
to gently
to remove the booming effect of the micro-
Advertisement
Table of Contents
