Students at the Frost School of Music had an “ear-opening” experience when their Computational Psycho-acoustics class was lectured by Jim DeGrandis of Acoustics First last month. The topics ranged from engineering to human perception of ultrasonic frequencies. The students were exposed to concepts and demonstrations of ultrasonic frequencies which have been modified in ways to make them audible, and ultrasonic anomalies affecting the audible range in ways that are very blatant and obvious.
One of the most stark examples of “audible ultrasound” being the demonstration of a Parametric Speaker, which modulates the ultrasonic carrier to produce very directional audible frequencies.
Jim also spoke at the student forum about misconceptions of what it really means to be “in the industry” …and did an encore demo of the Parametric Speaker – which had apparently been such a novel experience for the Psycho-Acoustics class that they ‘demanded’ it be experienced again by a wider audience. (and it was just plain fun!)
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With all the Diffusers on offer from Acoustics First® these days, this gem is sometimes overlooked: the QuadraPyramid™. Here’s an install pic of a few in the ceiling of a control room at the University of the Pacific!
There’s a reason why various pyramidal diffusers have been used for decades. They work, and they work well! The QuadraPyramid™ is our own take on this classic design, using four offset pyramids to create 16 angles of reflection on a single unit. Also, when mounted directly to a wall, these diffusers can double as a ‘mid-bass’ absorber, like in the project studio below.
This install pic shows a fantastic mix of products: Sound Channels® Wall Fabric, Sonora® Panels and Cloudscape® Baffles. Note how the Sound Channels fabric is used on the lower portion of the wall. Using a fabric like this is a great way to efficiently treat a large area of wall and is durable enough to take a beating from basketballs, volleyballs, etc. This installation also includes Sonora Panels on the upper portion of the wall, along with a generous helping of Cloudscape Baffles in the ceiling. Installing ceiling baffles in a dense pattern like this really helps tame the reverb in spaces with high ceilings! On a side note, all three of these products have a Class A fire rating and are great choices for public spaces, where fire codes are of paramount importance.
Cloudscape® Baffles are a wonderful product! This batch of baffles was installed in a middle school gymnasium/multi-purpose room by one of our dealers. Note how they were installed not just in the ceiling, but also on the walls by ‘chaining’ the baffles together. Most of the time we recommend hi-impact Sonora® Panels for the walls in school gyms such as this, but with a little ingenuity baffles can also get the job done!