Entries by Pat Brown

The Nyquist Plot – Part 1

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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

Room Survey 37 – Crossroads Fellowship

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by Pat Brown

Our spring 2019 Sound System Design seminar was held at Crossroads Fellowship in Raleigh, NC. The massive building is a converted power tool distribution warehouse, gutted and redesigned as an assembly space for Crossroads Fellowship church. It … Read more

Driving the 4 ohm Load

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by Pat Brown

Amplifier power ratings are good for window shopping and water cooler chats. If you need to drive a real-world 4 ohm Load, you need the matrix.

Long ago, 8 ohms was established as a practical impedance for

… Read more

A New Tool for Sound System Training

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Few areas of audio have become more confusing than amplifier power ratings. We have developed a tool to remove the veil, revealing not only the power rating, but what it is based upon.

We’re now in our third decade at … Read more