audio feedback
Audio

The Figure-Eight Feedback: Why ceiling mics and mix-minus shouldn’t mix.

Checklist Item Under Test: 6.31: Confirm that the speech reinforcement system is stable (no feedback) for the entire talker and … 0 359
Audio

Sex & Audio: A Clear Case Of Discrimination!

Various studies have been carried out over the years that show clear differences between how males and females listen and … 0 292
The Albuquerque City Council Chamber. Photo: Stephen Frazier
Audio

Hearing Loops: Assistive Listening Systems That Are Actually Used

After years of neglect, the federal government recognized the special auditory needs of the hard of hearing in the Americans … 0 216
Audio

Gymnatorium Absorption: The Sweet Spot

Although acoustic absorption is not usually the focal point of an install, it should not be discounted. You may not … 0 203
Audio

Aid Memoire! A Follow up to ‘Loop Gain’

It would seem that my September and October 2015 discussions have sparked more interest than almost any other I have … 0 113
Audio

Are They Smarter Than A Fifth Grader? – Condenser/Dynamic Mics

“When I look at the proposal for this system, I see there are multiple mic options available. Some of it … 0 61
Audio

Trust: Building it is Hard and Keeping it is Harder

Checklist Item Under Test: Report Signature: “I hereby certify that, in accordance with specification in product, practice and performance, this … 0 90
Audio

Sound Advice: On The Level Part 2: Peak Demand

Last month, I discussed the various sound level meter frequency weightings and integration times, and how these can affect the … 0 56
Audio

Achieving An Effective Sound Masking Curve

Recent design trends make today’s facilities ever more dependent on sound masking for speech privacy and noise control. Because a … 0 72
Audio, Industry Pioneers

Industry Pioneers #2: Bell, Edison And The Dawn of Telephony

This article was originally published in the June 2000 Sound & Communications, V.46 N.6. It should come as no surprise that … 0 71
Audio

The A, B, C To Z Of Sound Level Measurement

The other day, I was discussing signal-to-noise ratio (SNR) with a colleague and bemoaning the fact that many research papers/articles … 0 50
Audio, House Of Worship, IT/AV, Video

Producing Mega Experiences With Scott Mirkin

Forty large LED screens brought Pope Francis closer to audiences in Philadelphia. Although event producers have successfully used digital media … 0 112
Audio, Installations

Bojangles’ Coliseum Stays Competitive With New Audio

If you like to root for the underdog, then Bojangles’ Coliseum warrants your attention. The 9600-seat venue sits in a … 0 55
Courtesy Monte Bros.
Audio, House Of Worship

Cathedral Basilica Of Saints Peter And Paul Audio

In mid-August, I received a call from Fr. Gerald Gill, the rector of the Cathedral Basilica of Saints Peter and … 0 60
Audio

Validation: Caring About The Process Is Key

My manager at a hi-fi store years ago told me the secret to selling anything. First, recognize that the customer … 0 43
assistive-listening
Audio

Loop Gain—x2 It’s all about listening!

Last month’s piece about hearing aids and assistive listening devices seems to have struck a chord with many readers and, … 0 47
Audio, Business, Video

Coaxial Cable Is Still A Player

Ring out the old, ring in the…old? Last June at InfoComm, my industry colleague Malissa Dillman of Kramer Electronics taught … 0 62
Audio

Are They Smarter Than A Fifth Grader?

Become a Brain Surgeon in just 15 Minutes a Day! Okay, maybe not. Have you ever been asked to describe … 0 40
Audio

Loop Gain—With A Difference

Audio frequency induction loop systems. About 10% to 14% of the general population (US and Northern Europe) suffers from a … 0 41
Audio

No License? No Problem!

FCC issues new wireless/white space rules. On August 6, 2015, the Federal Communications Commission (FCC) released new rules concerning wireless … 0 51
Audio

Under Cover: What’s 6dB between friends?

As is well known, the nominal coverage angle of a loudspeaker is defined by its off axis, 6dB down points. … 0 43
Audio, Industry Pioneers

Industry Pioneers #1: Lord Rayleigh 1842-1919

John William Strutt, Lord Rayleigh; 1842 – 1919 This article was originally published in the February 2000 Sound & Communications, V.46 … 0 61
Audio, Installations

Technology Fulfills Holland Performing Arts Center’s Needs

“The times they are a-changin’.” Bob Dylan’s lyric aptly applies to the Peter Kiewit Concert Hall at the Holland Performing … 0 44
Audio, News

Hear Today, Gone Tomorrow: Some factors that affect our hearing perception.

The other day, I was setting up a fairly sophisticated and unusual paging voice alarm system and was checking out … 0 46
Audio, Digital Signage, News, Video

Cinema Sizzle: Getting into the show.

Movie theaters are not just for movies anymore: They are now upscale venues offering the flair of Hollywood for all … 0 48
Audio, Business

Playing the Numbers Game: Who is Responsible When it all goes Wrong?

Last month, I noted that some of the current STIPA meters do not meet the current (or even recent) standards … 0 50
Audio

Digital Wireless Mic Frequency Coordination Part 1: I should have known there was an app for that.

Checklist Items Under Test: 6.35: For wireless microphone systems, with all wireless microphones turned on, confirm that, throughout the specified … 0 39
Audio, IT/AV, Video

Caution! Merging Buses Ahead!

I would guess that a few readers of “AVent Horizon” are old enough to remember the Firesign Theater, a comedy … 0 35
Audio, Installations

Getting Students Involved

Seating in the Colony High School auditorium varies, and the room is used for theatrical presentations, concerts, school and community … 0 42
Audio, Installations, IT/AV, Video

The Backbone Of Healthcare: Tyler Junior College’s technology-enhanced classrooms.

In response to the critical need for nursing and other healthcare professionals in the state of Texas, Tyler Junior College … 0 45
Audio, IT/AV

Audio Over IP: Easy On The Budget, With Futureproof Design

Adoption of “audio-over-IP” technology is increasingly prevalent, and it’s a market presence worth discussing for systems integration. In basic terms, … 0 40
Audio, Business

Wireless vs. LTE Devices: The battle over 600MHz white space.

The Federal Communications Commission’s (FCC) broadcast television spectrum incentive auction has been a source of consternation and hand-wringing from parties … 0 57
Audio, News

The State Of The Audio Union

Last fall, I was attending a Dante symposium presented by Audinate in New York City. Shortly after lunch, while waiting … 0 37
Audio, IT/AV, News

It’s Time to Dive Into Audio Networking

Commercial and installed audio is at a crossroads. The inevitable merging of computer networking technology and audio distribution is here; … 0 40
Audio, News

Versatile, Timeless & Indispensable

For years, patch bays have provided critical flexibility and convenience to media facilities of all types, including studios, entertainment venues, … 0 29
Audio, News

Versatile, Timeless & Indispensable

For years, patch bays have provided critical flexibility and convenience to media facilities of all types, including studios, entertainment venues, … 0 23
Audio, News

Measure for Measure: Does your STIPA meter read the same as mine?

My comments on intelligibility in the February issue sparked a flurry of emails and questions concerning the measurement of STI … 0 41
Audio, News

When Manufacturers Go Bad

Checklist Items Under Test: Several, really, but for this story, 6.33: For conferencing mode, at the 65dB-SPL listening level, be … 0 37
Audio

Speech Intelligibility

A recent discussion with another consultant and client made me realize that many people, who I thought should know better, … 1 49
Audio

Word of Mouth

These days, I seem to watch more movies on planes than anywhere else. Although an enjoyable distraction, this is way … 0 45
Audio

A Tale of Two Mixers

Checklist Items Under Test: 6.33: For conferencing mode, at the 65dB SPL listening level, be able to demonstrate full duplex … 0 34
Audio

Speech Privacy: Dealing with work environment and legal requirements

Picture a typical office environment that you’ve worked on as a systems integrator. What does it look like? Chances are, … 0 47
Audio

Some End Of Year Thoughts: Apples, oranges & onions.

It has been an interesting yet frustrating year for me. Interesting in that some new and rather different (i.e., challenging) … 1 38
Audio

Some End Of Year Thoughts: Apples, oranges & onions.

It has been an interesting yet frustrating year for me. Interesting in that some new and rather different (i.e., challenging) … 1 54
Audio

Ranking The Senses: Is hi-res audio worth the effort?

High-resolution audio differs from high-definition video in some important respects. Frankly, video systems are generally easier to design. Although they … 0 36
Audio

Steering Columns In The Right Direction

All photos: Meyer Sound Digital beam steering offers a myriad of options. Column loudspeakers were a trendy choice in the … 0 73
Audio

Fools With Tools

Computer programs: boon or bane? About 15 years ago, if I had been asked if I made much use of … 0 35
Audio, IT/AV

Giving Fans More

Sooners AV distribution gets an upgrade. When the University of Oklahoma (OU) in Norman decided to do a major upgrade … 0 43
Audio

Sound Advice: Word Of Mouth, Part 4

Foot in mouth. One of the more interesting features of my job is that I get to travel around the … 0 36
Audio, Installations

Visual Beauty, Acoustic Challenge

Bridling marble to implement smart AVL. The Venetian (venetiannj.com), a large event and reception facility in Garfield NJ, gets raves … 0 39
Audio

The Commish: Stereo Audio Over One Cable

Why does the laptop sound so funny? In the AV industry, the end users are typically represented by two separate … 0 35
Audio

Word Of Mouth: S.O.V.: Save Our Vowels | Part 3

There can be little doubt, unless you are a DJ, of course, that good high-frequency performance from a sound system … 0 40
Audio

But The Spec Said… Who can you trust?

In the AV industry, the end users are typically represented by two separate yet equally important groups: the designers who … 0 34
Audio

CBC & ADA: Complying with new rules is the right thing to do.

Editor’s Note: You may have read some general information about the changes in the California Building Code as it relates … 0 35
Audio

CBC & ADA: Complying with new rules is the right thing to do.

Editor’s Note: You may have read some general information about the changes in the California Building Code as it relates … 0 42
Audio, IT/AV

New Directions For Integrators

Themed attractions offer crossover opportunities. Two Las Vegas-based integrators apply what they’ve learned serving the nightclub and casino markets to … 0 38
Audio

We’re From The Government: Will they shut down your wireless mics?

If you’ve been following the news lately, you know that the Federal Communications Commission (FCC) voted 3-2 back in May … 0 34
Audio

The FCC And Pro Wireless: Are we there yet?

The Federal Communications Commission (FCC) has had regulatory oversight of wireless microphones since rules were established for their operation in … 0 42
Audio

The Language Of Audio Conferencing: You don’t speak DSP? Do you know someone who does?

In the AV industry, the end users are typically represented by two separate yet equally important groups: the designers who … 0 42
Audio

Personal Audio Tune-Up: For the price of a plug-in, make an investment in yourself.

There are a few things about the analog signal processing era that I miss. One I miss most is the … 0 41
Audio

The Audio Envelope

We generally end up picking our own poisons. A recent (and rather spirited) debate in an online audio expert group … 0 82
Audio

Acoustician’s POV: Dining With Loudness

Do you want ear-splitting noise and migraines with that order? “What?” “I SAID, Mayor Di Blasio ought to pick up … 0 31
Audio

Sound Advice: Do Computers Have Ears?

Do you want ear-splitting noise and migraines with that order? Last month, I discussed how a number of manufacturers are … 0 34
Audio

Glass + Audio Challenge

Audio design at Toledo Museum of Art’s Great Gallery. Audiovisual integrators know that “glass” and “good acoustics” are typically mutually … 0 33
Audio

The Acoustic Wave Conclusion

Optimizing speech intelligibility for sports stadiums. In November 2013, Sound & Communications published Part 1 of “Optimizing Speech Intelligibility for … 0 47
Audio

Sound System Optimization

Doing it by numbers. Over the past couple of months, I have looked at why sound systems often go so … 0 35
Audio

SOUND ADVICE: Earsay

EAR x 2 joins IIIIIM and I6 M2 ! My recent column pieces on IIIIIM and I6M2 (December 2013 and … 0 38
Audio

The New Workplace

Acoustical planning provides effective environments. Those of us who work in offices have noticed some significant changes in the look, … 0 29
Audio

Optimizing Communication

Active acoustic technology provides more flexible rooms. By Steve Ellison & Pierre Germain The geology professor shows the surface of … 0 30
Audio

Why Are PA Systems So Often So Poor?

An extension of the theory: I6 M2! Last month, I introduced the IIIIIM concept. No sooner had I sent off … 0 31
Audio

Silver Ears

It is angst with 99 out of 100. There are a couple of topics I’ve avoided writing about for 20 … 0 30
Audio

Anatomy Of A Vegas Club: Gallery

Big sound, subtle lighting make The Strip’s latest entry a winner. Vegas dance clubs have a short shelf life, but … 0 28
Audio

Who Stole My DBs?

A saga of lower than expected sound pressure levels. When sound pressure levels are much less than expected, calculations and … 0 29
Audio

Who’s In Control?

The ergonomics of sound system designs. Using sophisticated technology works if it enables a better system to be provided, but … 0 26
Audio

Communications

Video without sound is… Although you can make an argument that communications can be made without it, no matter how … 0 29
Audio

It’s Time To Take The Building Back

Sound masking: a tipping point for AV. For the sound masking market, it’s been a long, circuitous route working with … 0 27
Audio

Measuring Audio Signals and Voltages, Part 3

Audio Signals and Voltage Distribution Essentials. While it is difficult to measure fluctuating signals, determining the various voltage points of … 0 23
Audio

Measuring Audio Signals & Voltages

Converting your voltmeter into a random number generator. Pt. 2 Last month, I looked at the accuracy of rms voltmeters … 0 29
Audio

Are Your Volts The Same As My Volts?

Measuring audio signals and voltages. Part 1 The other day, I bought an inexpensive digital multi meter for my site … 0 29
Audio

On The Level: Part 2

A saga of mixed loudspeakers and input levels. Part 2 Last month, Peter Mapp set out some of the issues … 0 27
Audio

On The Level

A saga of mixed loudspeakers and input levels. Part 1 A while ago, I was called in to look at … 0 30
Audio

The FCC's Measured & Practical Approach

A review of policy changes that affect wireless. This year, the FCC made two significant rulings, both demonstrating a practical … 0 29
Audio

What’s In Your Test Kit?

Essential test equipment for sound contractors and installers. I often am asked by integrators and installers what test equipment I … 0 27
Audio

In The Loop

Helping the growing population with hearing loss. Momentum is accelerating toward a new world of assistive listening for Americans with … 0 30
Audio

Audio Standards?

Are they a help or hindrance? Every year, more and more new standards appear relating to audio systems, and I … 0 28
Audio

Testing, Testing: What's All The Noise About?

Which test signals to use and when. Today, we have a wide variety of test signals available to us for … 0 27
Audio

Getting A Foot On The Ladder

Starting out in the AV world. I am writing this at 36,000 feet, somewhere over the Mediterranean on the way … 0 27
Audio

Active Acoustics In The Education

For optimal sound, school auditoriums need effective sound design. Not long ago, I sat in my daughter’s high school auditorium, prepared … 0 25
Audio

Great Acoustics: Pity About The Sound

Matching acoustics and function. Although most of my work relates to sound systems, I also spend a significant amount of … 0 28
Audio

Idiots With Meters And Idiot Meters

How do you know your measurement is correct? As audio engineers, almost every day we have to measure something, be … 0 32
Audio

Sound Quality CONCLUSION

A matter of timing. In the previous parts of this discussion about sound quality [December 2009, January and February 2010], … 0 25
Audio

Sound Quality PART 3

 A matter of timing. Last month, I looked at some of the effects that frequency response and frequency distortion have … 0 27
Audio

Sound Quality PART 2

A matter of frequency. In Part 1 last month, I introduced the concept of sound quality and some of the … 0 29
Audio

Sound quality PART 1

 Can we quantify it? I do not know how many specifications have crossed my desk that said that the sound … 0 27
Audio

Education

Now is a good time to add to your expertise. I have been meaning to raise the topic of audio … 0 24
Audio

On the level

The A, B and C of sound level measurement. For more than 40 years, the weighted sound level, or dBA, … 0 25
Audio

Hearing Matters

FCC actions leave wireless mics in limbo. Traveling over to InfoComm, I enjoyed(?) a nine-hour flight. After awhile, boredom set … 0 29
Audio

Polar explorations (CONCLUSION)

Polar balloons, Isobal plots and coverage plots In Part 1 of this two-part review last month, I showed that there … 0 27
Audio

SPOTLIGHT OF SOUND

Bringing audio in retail environments into focus. As retail marketing evolves and becomes increasingly competitive, marketers continue to search for … 0 29
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