Entries by Pat Brown

Two Amplifier Channels, One Loudspeaker

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Updated March 2020

The most popular form factor for audio power amplifiers is two-channel or “stereo.”  Pat Brown answers this question, “Why two amplifier channels?”

Photo of a rabbit with a carrotWhy two amplifier channels? It’s most likely due to the popularity of stereo playback systems … Read more

Peaks vs RMS – Keeping Peaks in Their Place

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Peaks vs RMS: This article explains why the modern obsession with “peak performance” represents a step backward in developing meaningful ratings and performance metrics for audio equipment.

I’ve enjoyed watching audio technology advance over the past decades, and I enjoy … Read more

Common Amplifier Format: MiniDSP PWR-ICE125

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by Pat Brown

Overview

The MiniDSP PWR-ICE125 is a 2-channel plate amplifier for active 2-way loudspeakers or subwoofers. Since these articles are tutorial in nature, I’ll use the PWR-ICE125 to present some important fundamentals regarding amplifier ratings and SPL calculations. … Read more

Common Amplifier Format: Lab Gruppen E 12:2

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by Pat Brown

Pat Brown continues with  the Common Amplifier Format (CAF) series. In this article, he overviews the Lab Gruppen E 12:2 amplifier, which is targeted for the installed sound market.

 

Overview

The Lab Gruppen E 12:2 is

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Common Amplifier Format: AtlasIED DPA 1202

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by Pat Brown

Pat Brown continues with the Common Amplifier Format (CAF) series. In this article, he overviews the AtlasIED DPA 1202 amplifier.

The Common Amplifier Format (CAF) series continues with the examination of an amplifier designed for the commercial … Read more

The Nyquist Plot

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by Pat Brown

The Nyquist plot is a powerful tool for examining audio filters, both analog and digital. It has been added to the latest version of Filter Hose.

I’ve had many instruments come and go through the years. The … Read more

Amplifier Loading – The Parade Route Scenario

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In the article, Pat Brown describes several ways that loudspeakers can be driven using a parade route scenario.

There are several competing philosophies among audio power amplifier designers as to how an amplifier should behave under load. They can be … Read more

Common Amplifier Format: Crown CTs 2000

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by Pat Brown

Pat Brown continues with “Common Amplifier Format (CAF)” series. In this article, he overviews the Crown CTs 2000 amplifier, a workhorse in the commercial sound market.

Crown Audio makes a lot of amplifier models to address the

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Common Amplifier Format: Ashly SRA-4150

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by Pat Brown

Much can be learned about amplifiers by reviewing/comparing a common set of specifications that were collected in the same manner. In this series, I’ll use the Common Amplifier Format (CAF) to periodically overview a selected make and

… Read more