White Space Update for Wireless Microphones
Several months ago (10-13-08) I wrote about the current state of the wireless microphone frequency spectrum and how the actions of congress and the FCC are shaping the future of wireless technology. Well, several notable updates and changes have been made since that time. You may recall that February 17, 2009, was the date set for the transition to DTV (Digital TV). Congress (in all its wisdom) decided that it would extend the deadline to June 12, 2009. (more)
The Leaky Bucket | How Sound Escapes
Blocking sound is often analogized to plugging the holes in a leaky bucket. If you plug up all the bucket holes except one, the bucket is still going to drain. In acoustics, an outstanding partition design will not adequately block sound if holes and weak spots exist where sound can find its way through. (more)
How LEED V3 Changes Everything
It’s official! The all new LEED Version 3 has been launched by the U.S. Green Building Council. The new system makes several big changes that affect everyone from architects and engineers to builders and building owners. This information is especially important if you are working on a LEED project or if you are a LEED Accredited Professional. Here are some of the initial updates at a glance: (more)
How Green Design Can Save You Some Green $$$
It seems like every project that comes across my desk has a stated goal of attaining some level of LEED Certification (LEED Silver, Gold, Platinum, whatever). We’re talking K-12 schools, universities, healthcare facilities, churches – they’re all “going green.” But how much does all this stuff cost? And can green design really save you some green $$$? (more)
Elbows vs. Sound Attenuators: Interchangeable?
It is common belief that a series of elbows near an air handling unit (AHU) can accomplish the same insertion loss as a manufactured duct sound attenuator. It’s true that elbows are less expensive than sound attenuators, but what acoustical performance is really achieved with this “low cost” substitution?
Let’s compare the two designs. Using the tables presented in the 2007 ASHRAE Handbook – HVAC Applications, for any type of elbow (round, rectangular, acoustically lined or not), the width of an elbow (in the plane that it turns) must equal or exceed 30 inches to get ANY insertion loss at 63 Hz. A 30 inch wide elbow provides only 1 dB of insertion loss (IL) at 125 Hz . These two frequencies are typically of concern when reducing sound from AHUs.
Traditional Church Acoustics: The Battle For Art and Audio
For centuries, traditional church architecture has been pregnant with meaning and symbolism. The building itself, from interior to exterior, is meant to carry a visual message that transcends language. This is why art and aesthetics play an uncompromising role in traditional church architectural planning: because they help to convey the truth of that ancient message. The traditions are upheld by creating spiritually (and aesthetically) rich environments through the use of symbolism and focal points – ornate crosses, stained glass windows, and so on. When our acoustical engineers and audio-visual design consultants (many of whom are dedicated church members and volunteers themselves) meet with churches leaders to discuss their needs, there always seems to be some tension between art and audio. So, which should take priority? (more)
It’s time for another semester, and I tell my architecture students that if there’s one thing they learn in my acoustics class, it’s that porous absorbers do not block sound. A porous sound absorber, by definition, has many tiny interconnected voids that sound travels through. Fiberglass and open cell foam are examples. The sound wave loses its energy through friction between the air particles and the fibers/void walls of the material it is passing through. (more)
Decision 2008 – White Space Disaster for Wireless Mics
Last Tuesday, while many of us were casting our votes in the presidential election, the Federal Communications Commission (FCC) was making a landmark decision of its own. On their private ballot was a proposal to open the so-called “TV White Spaces” of the frequency spectrum for expanded use. And on November 4th, the proposal passed. Sounds all fine and good, right? Well, maybe not. If the FCC’s current plan goes through, it will lead to a crossroads for the wireless microphone industry and for AV designers. (more)
I worked for years in churches as a Technical Director, and during my tenure in that position I had a front row seat on the effects of volunteer-installed equipment. While there is a time and place for volunteers to do some elements of installation, let me say that it’s generally a bad idea. Not because volunteers will always get it wrong, but because volunteers are too valuable to compromise. Here are a few observations/experiences from my years in the trenches. (more)
Acoustical Design for Contemporary Churches
The challenge with contemporary church architecture is that the term “contemporary” means a lot of different things to a lot of different people. For some, it means a praise band and a projector. For others, it means the service is full of drama, dance, video, interactive preaching, and more. With all the different styles, a lot of contemporary churches feel stuck in the middle with facilities that are in between “where it is” and “where it ought to be.” (more)
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