EDI is the perfect source for every acoustic solution.

Founded over 30 years ago, EDI's fully trained acoustical engineering specialists have served a host of clients including theatres, auditoria, arenas, churches, synagogues, educational, commercial and industrial facilities. Such spaces share one common function - the presentation of information - be it for business, entertainment, or worship. EDI refers to all of these spaces by the more encompassing descriptor, Presentation Spaces. However, the mission and objectives of each differ to varying degrees. Occasionally a single space will serve multiple programs sufficiently diverse such that the acoustics therein must serve all objectives flawlessly.

Recent times have seen significant growth in the design and construction of new presentation spaces and the renovation of older ones. Additionally, digital technology has revolutionized the "sound system", audio-visual, and theatre industries. EDI can help bring your organization up to speed on all of the current hot technologies to ensure that your project is given the edge it deserves.

EDI was founded in 1970 to provide consulting engineering services in areas of specialized technology. Two of EDI's founding principals -- Dr. J. T. Weissenburger and Dr. J. W. Schweiker (retired) -- had at one time worked for McDonnell Douglas Co. in the Structural Dynamics Department. Thus, it was natural that acoustics and vibrations would be principal among EDI's initial expertise. Since that time, EDI has provided services in many areas, most of which are in or related to, the broad fields of acoustics and vibrations -- seismic response analysis, blast monitoring, sound reinforcement system design, and theatre technology to name a few.

EDI is a Corporation chartered by the State of Missouri. EDI is licensed by the State of Missouri Board for Architects, Professional Engineers and Land Surveyors for the practice of Professional Engineering. Principals are registered Professional Engineers.

Performance spaces require considerable amounts of acoustical absorption placed on the surfaces throughout to enhance the listening experience and improve speech intelligibility. We specialize in acoustically modeling rooms and determining what materials and what amounts need to be applied to a space. EDI can test the reverberation time (RT) of your room and use that information to make recommendations to fine tune your product.EDI can also evaluate and make recommendations for the design of wall and floor/ceiling partitions and assemblies to ensure privacy. Privacy between adjacent spaces hinges on the quality and design of the wall and floor/ceiling partitions.


EDI is capable of designing full-scale, professional-level, Audio Visual Systems. We will provide Design Documents, Bid Documents, and coordinate any issues that may come forth during installation. We can create full design drawings and specifications for bidding purposes for spaces where the goal is to provide a good listening and/or performance environment. Consulting for the following:

Analyses and recommendations that target building system noise sources.



We provide analysis and recommendations to help reduce employee and property line impact for industrial noise sources.

EDI provides services in the following areas:

EDI can provide engineering services when interior spaces are impacted by exterior noises generated by industry, highways, airplanes, trains, and other man made sounds.

Additionally, we can perform tests to determine the interior metrics of a building such as Field Sound Transmission Class or Field Impact Isolation Class of a wall partition or floor/ceiling assembly.

Performance Spaces & Auditoria

EDI has provided professional engineering services to a diverse group of industrial clients. The following is a representative listing of these clients:

EDI has provided professional engineering services to many architects, builders, and engineering companies. The following is a representative listing of these clients:

EDI has consulted with numerous federal, state, and local government agencies on a wide variety of projects. Jobs vary from federal installations concerns over sensitive material protection to small community’s issues over noise code compliance. Below is a listing of governmental agency clients:

The following is a representative listing of these clients:

J.T. Weissenburger D.Sc. P.E. - President

EDI was founded in 1970 to provide consulting engineering services in areas of specialized technology. Two of EDI's founding principals -- Dr. J. T. Weissenburger and Dr. J.W. Schweiker (retired) -- had at one time worked for McDonnell Douglas Co. in the Structural Dynamics Department. Thus, it was natural that acoustics and vibrations would be principal among EDI's initial expertise. Since that time, EDI has provided services in many areas, most of which are in or related to, the broad fields of acoustics and vibrations -- seismic response analysis, blast monitoring, sound reinforcement system design, and theatre technology to name a few.
Dr. Weissenburger was one of the principal founders of Engineering Dynamics International (EDI) in 1970.He has primary responsibility for the technical management of the company. He is an active engineer in many projects, particularly those involving acoustics, theater technology, and environmental noise studies. However, his experience and expertise extends to most area of acoustics and vibrations. He is past president of NCAC and a fellow ASME. He has written a chapter on noise and vibration for the second edition of Mechanical and Electrical Systems in Buildings, by William Tao and Richard Janis (Prentice Hall).

Barb Vallo - Office Manager

In 1983 when Mrs. Vallo joined our staff, the fellow dubbed her the 'Den Mother'. It was her responsibilty to keep us all on our toes, making sure expense vouchers, time sheets, work logs, and 101 little details that engineers like to skip were in order. Over the years her responsibilities have increased and in 1994 she was elected to our board of directors as Secretary. She is an integral part of the EDI family.

Gary Brown - Project Engineer

Gary rejoined the EDI staff in March 1998. Since that time, he has largely been responsible for HVAC Analysis and Large Scale Environmental Noise Investigations. He also attends much of EDI's field vibration work. He recently earned a Bachelor's of Science in Civil Engineering from the Washington University / UMSL joint engineering program.

Jason Farrell - Senior Technician

Jason joined EDI in December 2002 and quickly took over most of the work on the airport related projects. He is currently pursuing a Bachelor's Degree in Mechanical Engineering in the Joint Engineering program between UMSL and Washington University with an expected graduation date of May 2008. Jason is die hard sports fanatic.

Brian Anderson - Field Technician

Brian has been a field technician with EDI since September of 2004. He primarily works on the Airport Noise Abatement Program making field measurements. Brian also performs field work for the Lambert Airport temporary noise monitoring project.

Gary Miller - A/V Specialist

Gary joined the EDI staff in February 2008. He brings to the EDI staff extensive experience in the design of audio, video and lighting systems. Gary is pursuing a BachelorŐs Degree in Media Communications at Webster University. Among the many tours he has worked with, he was an Assistant Stage Manager and Head Audio Engineer for the Moscow Ballet Great Russian Nutcracker North American tour.