When I first entered the live music scene several years ago,
loudspeakers were little more than wooden boxes with speakers installed
in the front. These square and rectangular boxes worked fairly well in
the hands of experienced sound crews and engineers who could afford the
best equipment to get the most out of them. For the less experienced
however, these cabinets were a breeding ground for resonant frequencies
and standing waves that turned their sound into an undesirable mush.
With much effort and experimentation with placement, most were able to
get results they could live with.
While newer speakers and electronics were developed over the years, the
problems with the cabinet designs were for the most part ignored. That
was until Mackie introduced their line of injection molded
polypropylene speaker enclosures. It has been my experience that Mackie
does not approach a problem from only one direction, but they tend to
innovate on several angles at a once. This is achieved by hiring people
who use and therefore understand firsthand the problems associated with
most loudspeakers and work hard to solve these issues. This was
especially true with the C300z passive loudspeakers.
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http://www.guitargearheads.com/modules/news/article.php?storyid=144