Acoustic Testing: Computer Modeling vs. Real World Accuracy

For anyone  that is interested in the accuracy of different testing methods (computer modeling vs. real world accuracy) for determining the STC of a wall assembly, Sound & Vibration Magazine has an article in its December 2014 issue.

It covers the testing comparison of the different methods, using  four types of wall assemblies.

A very interesting note is the drop in efficiency of all of the drywall assemblies between 1500 Hz. and 4000 Hz., as compared with a 6” concrete wall.


Read the full article here: Computer Modeling of STC – Options and Accuracy, by Daniel M. Horan


Michael Binns

Michael Binns

Founder of Acoustical Solutions

800 782 5742 ext. 112

Whisperwave Clouds at UVA OpenGrounds

UVA OpenGroundsThe OpenGrounds facility at the University of Virginia was designed as a collaborative meeting and workspace for faculty and student groups. William Sherman, the architect behind the renovation of the building knew that a space with high ceilings and an open layout like this one, needed to have acoustics taken into consideration.

Large gatherings, open table discussions, and presentations require a room with low reverberation for speech intelligibility. So to achieve this, Sherman contacted us and we recommended Whisperwave™ Clouds. Whisperwave acoustical clouds are made with sound absorbing foam material with an NRC .85 and are effective at reducing high reverberation times created by bare surfaces.

Whisperwave Clouds at OpenGrounds

Lindsey Hepler, the program manager for OpenGrounds, says that there was a noticeable difference in the sound and usability of the space after the Whisperwave Clouds were installed.

whisperwave clouds


See the full case study!


Quick Solutions: Soundproofing an Interior Window

Many business don’t own, but rent, their office space. This can cause a headache when modification of the facility is needed to suit the organization’s changing needs, but isn’t allowed by the landlord.

This was the case with a clinical social worker who rented a small office space in a great location. There was originally a receptionist’s office with an interior window connected to the waiting room. This office needed to be converted to a patient counseling room to accommodate the growing number of clients, but obviously the room had to be as private as possible. The transition would be impossible without completely soundproofing the opening in the wall - ideally by filling it in and making the whole wall solid.

The owner of the building wasn’t open to any permanent modifications, so the social worker called Acoustical Solutions to see if anything could be done to block sound completely through the opening.

ASI Rep Kevin McIver came up with the idea to use a combination sound blocking and absorbing product on the opening, that could be covered to hide the modification and put clients more at ease:

“We used an ABSC-25 blanket to cover the window on one side and they put up artwork on the either side”

The blanket has an STC of up to 33, the same sound transmission class as a standard interior wall. The response from the client was positive, and the installation method used suited their need for a removable solution:

“Hi Kevin . . . worked out great! Perfect fit and the heavy duty velcro helped to hold it securely to the outer molding!

Here is a pic of the blanket up and the outside of the window for you to get an idea of what it looks like underneath the blanket.

Thanks so much . . . I have given your card to a colleague of mine too! – Renee”

acoustical blanket window


For any questions about this application or any other noise control issues, call Acoustical Solutions at 800 782 5742!



Kevin McIver

Architectural Sales Rep

800 782 5742 ext. 19