Troubleshooting - True Systems P2 Analog Bedienungsanleitung

The Stereo Phase Correlation circuit "listens" to the two preamp outputs
in the frequency range where human hearing is most sensitive to audio
phase information. It analyzes the phase information and displays the
following conditions:
• Output signals are essentially mono
• Output signals exhibit phase information that indicates a good stereo
image
• Output contains too much outofphase information, producing tonal
variance or muddiness (Adjust the microphone positions)
• Outputs are completely outofphase. (Select the "180°" polarity re-
verse on one channel)
The Stereo Phase Correlation Display is also useful when placing two
mics on an instrument (for instance, acoustic guitar) to achieve a par-
ticular tonal effect. The Phase Display will show any phase errors that
produce a combfiltering effect, allowing you to interactively adjust the
microphone position for optimum sound.
Here are some tips for using the Stereo Phase Correlation Display:
• When attempting to get a good stereo image, position the mics so
that most of the Phase Display intensity is centered around the middle
(yellow) range.
• The Stereo Phase Correlation Display should not be thought of in
the same way that you think of a Level Indicator. In general, we
don't want to see a RED Level Indicator because it means we're go-
ing to get distortion. But, with the Phase Display, some amount of
"red activity" is normal when we have an acceptable stereo image.
This happens because there is a mix of various phase information in
any complex audio signal (music, voice). Conversely, an "all green"
display is "safe" in that it shows minimal out of phase information,
but, for the same reason, the output signals will not exhibit much of a
stereo image.
• You may want to become familiar with the Phase Display by observ-
ing its activity in known situations. That is, situations where you know
from experience that you have good mic positioning and stereo im-
age. Also, observe the Phase Display in situations that you know will
produce poor sonic outcome.
• The Stereo Phase Correlation Display is intended for use with stereo
mic placement techniques. The Display may not provide meaningful
information for independent, two channel applications.
• When using the MS mode it is unlikely that you will see a Polarity Re-
versal situation as illustrated in the figure above. However, a right/left
reversal may occur due to wiring variations or reversed orientation of
the SIDE mic. This can be corrected by selecting 180° on Channel 2.
• As always, your ears are the final reference! The Stereo Phase Correla-
tion Display is provided as an accessory to help you with a potentially
difficult and subjective part of the recording/sound reinforcement
process. But when all is said and done, what you hear is more impor-
tant than what you see on this Display.
• The Phase Display can become quite "busy" with complex sound
sources. After mic positioning has been determined, you may wish to
turn off the flickering Display with this ON/OFF selector.
analog
P2
9 Phase correlation Display
Display Examples
Output signals are essen-
tially mono
Output signals exhibit
phase information that
indicates a good stereo
image
Output contains too
much out-of-phase infor-
mation, producing tonal
variance or muddiness
>> Adjust the microphone
positions
Outputs are completely
out-of-phase.
>> Select the "180°"
polarity reverse on one
channel
10
Display ON/OFF
systems
TRUE
M/S Technics
STEREO PHASE CORRELATION
0 90 180
STEREO PHASE CORRELATION
0 90 180
STEREO PHASE CORRELATION
0 90 180
STEREO PHASE CORRELATION
0 90 180
1
E