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++PSI++++PSI++++PSI++++PSI++++PSI++++PSI++++PSI++<br />
The Swiss Precision Active Monitoring Series:<br />
More Than A Black Box!<br />
The philosophy of PSI <strong>Audio</strong> can be compared to Swiss watch designers. Our vision is to be<br />
globally recognised as pioneers in precision audio, combining innovation, creativity<br />
and technology.<br />
Designed and manufactured at our Yverdon<br />
workshops in Switzerland, the latest<br />
generation of PSI <strong>Audio</strong> speakers is the<br />
culmination of 30 years of knowledge of<br />
materials and treatments, guided by a<br />
thorough understanding of acoustics.<br />
The unique precision of PSI <strong>Audio</strong><br />
monitors is a delicate mix between the<br />
passion, experience and know-how of<br />
electro-acoustic technology.<br />
All of the product range takes advantage<br />
of our knowledge, and we strive to deliver<br />
the most coherent sound and design<br />
between all our models.<br />
At the core of our speaker per<strong>for</strong>mance is<br />
an electronic design based on two exclusive<br />
concepts – CPR and AOI. This technology<br />
enables us to show people that PSI <strong>Audio</strong> is<br />
more than a black box.<br />
CPR<br />
The CPR system consists of multiple all-<br />
pass fi lters, each of which acts in a specifi c<br />
frequency range in order to obtain a wide<br />
area of Compensated Phase Response,<br />
generating a constant group delay.<br />
Thanks to the CPR system, the position of<br />
24 PSI<br />
the sound image is highly accurate.<br />
This technology allows the design of<br />
surround sound systems with different types<br />
of PSI <strong>Audio</strong> speakers that maintains an<br />
accurate phase response.<br />
Practical Advantages of CPR,<br />
and Impact on Stereo Applications<br />
The ear is very sensitive to group delays<br />
or phase irregularities of sounds. The<br />
human brain detects such irregularities<br />
easily and processes them into space related<br />
in<strong>for</strong>mation such as positioning a sound<br />
source. All traditionally designed speaker<br />
systems suffer to a certain degree with such<br />
irregularities. These irregularities are the<br />
reason why some speakers produce a wider<br />
and deeper room perception that determines<br />
the reproduction of the sound image.<br />
The speaker system represents the<br />
reference tool of every sound engineer.<br />
An accurate transient response particularly<br />
helps the sound engineer during the fi ne<br />
tuning of the reverbs effects, or during the<br />
design of a specifi c sound and its position in<br />
the sound image.<br />
As a sound recording passes through<br />
Full PSI <strong>Audio</strong> monitors range. A225-M, A25-M, A21-M, A17-M, A14-M<br />
various processes (recording, mixing<br />
and mastering) in which various people,<br />
locations, and there<strong>for</strong>e speaker systems,<br />
will be involved, corrections may be applied<br />
due solely to phase irregularities that<br />
are not present on the actual recording.<br />
The PSI <strong>Audio</strong> speakers feature our unique<br />
CPR system that generates a Compensated<br />
Phase Response, removing such<br />
irregularities, generating a stereo image<br />
and projected room of extreme accuracy. PSI<br />
<strong>Audio</strong> speakers provide a more accurate and<br />
precise reference tool to the sound engineer.<br />
CPR Impact on Surround Sound Applications<br />
Traditional speaker designs have different<br />
phase responses, and there<strong>for</strong>e the phase<br />
inaccuracy phenomenon is worse in<br />
surround sound applications where room<br />
in<strong>for</strong>mation and positioning have an even<br />
higher priority and a more critical part of<br />
the sound engineering process. This is one<br />
of the reasons why speaker manufacturers<br />
strongly recommend using speakers of<br />
the same type when creating a surround<br />
sound system. The CPR system by PSI<br />
<strong>Audio</strong> features an extremely accurate and<br />
superior surround sound image and a<br />
much improved working environment.<br />
One of the big advantages of the CPR system<br />
is also that <strong>for</strong> the fi rst time a user can mix<br />
different types of PSA <strong>Audio</strong> speakers in a<br />
surround sound system, whilst maintaining<br />
perfectly accurate phase response. Not only<br />
will the PSI <strong>Audio</strong> surround system sound<br />
much more accurate, and there<strong>for</strong>e provide<br />
a superior working tool, but it can also<br />
introduce signifi cant cost and space savings<br />
when investing in a new monitoring system.<br />
AOI<br />
The AOI system detects movement of<br />
the membrane and the moving coil, and<br />
processes them using counter reaction<br />
fi ltering. The damping rate is continuously