... This well-designed circumstance allowed
the team to exploit a pocket of speech intelligibility in the vertical
zone by using downward-firing loudspeakers, each esconced in a trumpet
in the center of a chandelier, while still allowing a very grand
reverberant zone for the organ and music.
The speech zone is controlled by the
aforementioned tapestries on the sides walls, which absorb reflections
off the floor, while the acoustic treatment in the ceiling further
absorb the vertical reflections. ...
The ceiling above the organ is also
slatted but not filled with absorptive material; this gives the organ
the near-field reflections it needs to project its full amplitude and
dynamic range into the worship space.
The audience, ... could discern clearly
that the design team had achieved their goal of creating both speech
intelligibility and music reverberance in the same space.
Source: LA AES technical tour of the
Cathedral of our Lady of the Angels February 17, 2004
Letters of Thanks
Over the years John has received numerous
letters from pleased clients thanking him for his work:
My highest regards to your Mr.
Prohs who not only had the knowledge overcome the engineering and
technical problems, but also possessed a diplomacy and language
skills to reconcile all parties involved, as well as common to
relate them whatever level of understanding needed ...
I have yet to meet anyone who
possess the wide variety of skills and the ability to use them so
effectively as Mr. Prohs.
Christopher B. Parsons,
Stagehands Unlimited Inc.
Sound engineer for
Norfolk Scope Arena
long after opening, it became apparent the sound system and
acoustic will characteristics of the facility were subpar.
Mr. John Prohs did an acoustical/sound system study prior to the
convention ... Mr. Prohs and his staff assisted with
implementing several practical low-cost changes. The sound
characteristics of the facility were measurably improved.
I highly recommend them
as experts in this area.
Daniel O. Davis
Pensacola Civic Center
We are very pleased with the
results of your work ... and believe me we have had sound
companies from Georgia and Florida come here to work on the system
before and none have done a job equal to which your crew has
The system design is without a
doubt much better than I could have imagined. You are to be
commended on your knowledge and technical abilities. I feel
very fortunate to have been able to work with someone of your
stature. All the praise and respect I hear others speak of
you is well deserved. ...
Center, Daytona Beach