Using PA speakers

January 6, 2023
 by Paul McGowan

3 comments on “Using PA speakers”

  1. I know of on case in a very high end speaker where PA audio speakers were used, the woofers of the Pipe Dreams line sources. They were used because of the need to handle huge amounts of power due to their bass loading method and while very successful were not mentioned because the manufacturer knew that many listeners would not listen but assume the woofers couldn’t work with PA drivers.

    Basically the woofers used two 18″ PA drivers in push/pull in a small box, so small the box/ driver combo had a resonance about 180 Hz, meaning the bass rolled off at 12 dB/octave below that. In order to get bass down to below 20 Hz a 12 dB/octave boost was used to get flat bass with a crossover around 70 Hz. The result was deep bass with essentially no overhang since a driver below resonance doesn’t like to move at all. The problem was that now a driver was needed that could handle huge amounts of continuous power and no audiophile woofer qualified; they’d blow up almost instantly. The answer was a PA driver.

    I believe McIntosh also used this concept in some of their own speakers as far back as the 1970s. I don’t know if Pipe Dreams got their idea from McIntosh.

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