IIR Room Tuning | FIR Designer Case Study

Room Tuning With IIRs using FIR Designer

IIR Room Tuning | FIR Designer Case Study

Room tuning using IIR filters commonly involves taking live, continuous measurements while adjusting processor settings. Alternatively, it can be an iterative process of measuring and filter adjustment. When FIR-capable amplifiers & processors are involved, room tuning can be optimized further by using the same loudspeaker measurements to develop custom FIR …

Measurement and Optimization

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 …

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 …

Measurement and Optimization

A Tale of Two Processors

It is widely known that different Digital Signal Processors (DSPs) sound different. I have heard this difference ascribed to everything from sample rate to the quality of the limiters, whatever that means. Certainly there is a difference to be found, but I suspect it is not going to be discovered …

Measurement and Optimization

Advanced Subwoofer Techniques

There are a few tricks you can pull out of your sleeve to make your low frequency arrays work better. By building directional subwoofer arrays, energy can be kept off the stage and walls and kept on the audience where it belongs. These arrays require a little more signal processing …

Measurement and Optimization

Run and Gun Subwoofer Arraying

Of all the tweaking I do as a system tech, the most common is fixing mediocre subwoofer setups. Problems in this area are so prevalent that most audio professionals take them for granted or assume there is no room for improvement. There is often a better solution, which furthermore is …

Measurement and Optimization

The Devil With Your Auto-RTA

I read approximately once a month about some weekend warrior who has just acquired their first DSP (Digital Signal Processor) system controller and seeks to understand how its auto RTA (Real Time Analyzer) function can help them get better performance out of their portable sound system. Invariably the DSP unit …

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IIR Room Tuning | FIR Designer Case Study