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Monday, July 26, 2010
Equalizing the Room - What it Really Means
Bob McCarthy
07/26/10 06:56 PM,
0 Comments
“I am going to equalize the room.” We’ve all heard that statement so many times that we scarcely think about what it literally means. We know that in practical terms it means adjusting an equalizer to suit your taste. It…
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Tuesday, July 06, 2010
A Real World Example of Limiting Distances
Pat Brown
07/06/10 02:03 PM,
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If acoustic parameters sometimes seem difficult to grasp, this practical example should help clarify at least one of them, the Limiting Distance, DL. This is a parameter associated with reverberant spaces, such as gyms and churches with little absorption. Remember…
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Friday, July 02, 2010
Tuning A System With FFT: Getting It Close Without Listening
John Murray
07/02/10 04:05 PM,
1 Comment
When last we left off, you had just acquired a 3-D, FFT -based measurement system and were ready to use it to tune a sound system. (Click here to view the previous article.) So let’s get to it! The first…
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Thursday, June 24, 2010
What’s The Measurement? Understanding And Properly Using RTA & FFT
John Murray
06/24/10 03:14 PM,
3 Comments
What’s the best way to equalize a sound system - by ear or by measurement? The short answer is both. Each method compliments the other. The ultimate qualification for sound quality is the ear. If it doesn’t sound right, nothing…
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Thursday, May 27, 2010
The Nyquist Plot Explained
Don Davis
05/27/10 02:55 PM,
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Harry Nyquist is famed for his work on feedback circuit analysis. His Nyquist plot makes visual simultaneously the following viewpoints of the signal: 1. The real part 2. The imaginary part 3. The magnitude 4. The…
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Tuesday, December 29, 2009
Building Your Worship Center For Quality Sound & Acoustics
Vance Breshears
12/29/09 04:34 PM,
0 Comments
“Hi, my name is Bob. I’m with “xyz” church and we’re designing a new worship center,” says a voice on the other end of the phone. “The architect told us it’s time to get a sound guy involved, so I’m…
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Thursday, December 24, 2009
Loudspeaker Sensitivity: What’s A Watt Anyway?
Charlie Hughes
12/24/09 12:52 PM,
1 Comment
The specification of a loudspeaker’s sensitivity is probably one of the most common, yet perhaps one of the most misunderstood. It’s common to see the magnitude response of a loudspeaker system reduced to a single number as a sensitivity rating.…
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Tuesday, December 22, 2009
The Devil And The Auto RTA: Don’t Forget To Use Your Ears
Bennett Prescott
12/22/09 11:06 AM,
1 Comment
In my perhaps too frequent visits to the Live Audio Board (LAB), I regularly read about weekend warriors who have just acquired their first DSP (digital signal processor) system controller and are seeking to understand how it’s auto RTA (real-time…
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Saturday, December 19, 2009
RT: Reverberation Time = Real Tricky? Comparisons Between Measured & Predicted
Jeff D. Szymanski
12/19/09 11:10 AM,
0 Comments
In working with sound and acoustics, here’s something many of us do but may not actually think about enough: Comparisons between measured and predicted reverberation times (RTs). RT (a.k.a., “RT60,” “T60,” “T,” et al) is a widely used quantifier of…
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Thursday, November 19, 2009
Understanding Sound System, Loudspeaker & Room Interactions
Sam Berkow
11/19/09 11:46 AM,
4 Comments
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Friday, June 12, 2009
Acoustic Fundamentals And The Nature Of Sound
Neil Thompson Shade
06/12/09 05:07 PM,
3 Comments
Why should one bother trying to understand basic acoustics? The most simple (and correct) answer is that study of basic concepts enables one to sort through the truth, semi-truth, myths and flat-out errors that pervade the pro audio industry. The…
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Friday, May 08, 2009
Proper Loudspeaker Placement: How To Avoid Lobes and Nulls
Pat Brown
05/08/09 11:53 AM,
3 Comments
The sound system in your house of worship goes into feedback whenever microphones pass under the loudspeaker array. Worse yet, there are “soft spots” in some sections of the audience area. Choir mics “squeal” before they are loud enough and…
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Thursday, May 01, 2008
SIA Smaart Live for Beginners
Doug Fowler
05/01/08 11:45 AM,
2 Comments
A New Paradigm – Linear Transfer Before delving into the nuts and bolts it is necessary to examine the desired goal of measurement. After all, how can one get somewhere without knowing the destination? After much exposure to Smaart in…
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Sunday, December 30, 2007
Using “%ALcons” to Aim a Line Array
Pat Brown
12/30/07 01:15 PM,
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A small section of rural southern Indiana has a dense Roman Catholic population of predominantly German descent. A number of traditional church buildings dot the landscape - most of which are very old and very reverberant. Buddy Ward is the…
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Predicting Array Performance
Bruce Main
12/30/07 12:54 PM,
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Back in the good old days predicting the performance of a group of loudspeakers was a hit and miss proposition. We tried to hit all the people and miss the walls. We were happy if we had enough devices to…
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How To Make High-Resolution Impedance Measurements
Pat Brown
12/30/07 12:31 PM,
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Because the impedance of a loudspeaker is a frequency-dependent parameter, it must be measured at multiple frequencies to get a true picture of what the amplifier is “seeing” at its output terminals. While very sophisticated methods and instruments exist, you…
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Transcript: Smaart Impulse & Phase Measurement
PSW Staff
12/30/07 12:22 PM,
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Question posted by Patrik Arnekvist on September 17, 2001 I know there’s a lot of Smaart experts here so here goes a thought. When using the delay locator, Smaart assumes that the right delay setting is at the highest peak…
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Monday, October 22, 2001
Transcript: Using Smaart with Jamie Anderson
PSW Staff
10/22/01 02:33 PM,
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Moderator: (Dave Dermont) Good evening and welcome to our chat with Jamie Anderson of SIA Software Company. Jamie, could you give us some background about what you did before SIA, for those of us too lazy to read the bio?…
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Wednesday, September 05, 2001
Transcript: EASE 4.0 with Ron Sauro
PSW Staff
09/05/01 11:35 AM,
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Moderator: Welcome to tonight’s live chat session with Ron Sauro, who’s been gracious enough to join us to talk about EASE and new EASE 4.0. Ron, can you start by talking a bit about your background and experience with EASE?…
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