Audio FIR Filtering

Audio FIR Filtering

Although not a new technology, manufacturers are increasingly including FIR filtering in loudspeaker processors and DSP based amplifiers due to the significant increase in performance-versus-cost of microprocessors and DSP hardware. The advantages of FIR filtering include more arbitrary and fine control of a filter’s magnitude and phase characteristics, independent control …

Measurement and Optimization

Cardioid Sub Arrays (Lots of them)

After reading a paper by the city of Amsterdam regarding SPL management during large events and especially some remarks regarding Cardioid Sub Arrays I did some sub array designs using Meyer Sound’s Map on Line. After the predictions were done i decided to test a bunch of them using the …

Measurement and Optimization

Equalizing Loudspeakers

This is a well-known problem for equalizing any system with the linear (usually complex) transfer function K(jOm) by use of a correcting system (circuitry) with the transfer function 1/ K(jOm) that equates as K(jOm)*1/ K(jOm)=1 unity transfer. For some this is all very “ordinary” and long-ago resolved and there are …

Power

Power Distribution Part 3 – Branch Circuit Distros

As the size of the event increases, so usually do the power requirements. [URL=”http://soundforums.net/content/2886-Power-Distribution-Part-2-The-Poor-Man-s-Distro”]The Poor Man’s Distro concept[/URL] can help manage up to about 4 circuits sourced from around the room – assuming you can find that many, but that’s about it. Even finding two or three circuits may require long …

Power

Power Distribution Part 2 – The Poor Man’s Distro

In part one of the series, we covered some methods to find multiple circuits in a venue. This next section covers how to use them best. Dividing the Load The primary reason to seek out multiple circuits is because the demand of your system exceeds what a single circuit can …

Power

Power Distribution Part 1 – Multiple Ciruits

It doesn’t take long before a 20A 120V circuit starts to seem small. In this article series, we will take a look at several next steps. A Word About Safety Electricity can be dangerous. In addition to shock potential, electricity can also be a fire or arc flash hazard, particularly …

Power

Understanding Power Consumption, Part 2

[B]This is the second half of the article, split due to post length limits. The first part is here: [/B][URL=”https://soundforums.net/entries/1191-Understanding-Power-Consumption-Part-1″]Understanding Power Consumption, Part 1[/URL][B] Case study: Allen & Heath GLD80 mixing console[/B] A&H’s datasheet lists the maximum power consumption of the GLD80 surface at 95w, and the AR-2412 stage box …

Power

Understanding Power Consumption, Part 1

One of the foundational necessities of a successful gig is having adequate safe power. This can be a particular challenge at the Junior Varsity level. This article will be a high-level flyover, providing some basic insight into how the gear we use works. Future articles will go deeper. What’s a …

Measurement and Optimization

Stair Cardioid Subwoofer Array

The advantages of cardioid sub configurations are well known, however they also have some drawbacks. Because of the nature of the arrays in their two-in-line and inverse-stacked variations, cardioid systems reduce the acoustical pressure not only on the stage, but also at FOH, the most important area! This is in …

Fundamentals of RF Coordination for Live Sound Part 2 - Antennas

Wireless

Fundamentals of RF Coordination for Live Sound Part 2 – Antennas

There seems to be a lot of discussion on various pro audio forums about choosing antennas and how to best configure your wireless systems for optimum performance. There are descriptions of many examples of setups that have worked well for specific situations, and different opinions about general rules of thumb. …