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Some more pictures of the insides of A180.Inside JBL Stage A180 - crossover filter photos:
Also, from hometheaterhifi review:
… I had the opportunity to contact Mr. An Nguyen, one of the designers of the JBL Stage A180 loudspeakers. …
When asked about the “2.5-way design,” Mr. Nguyen said, “In the 2-way design, the two mid-bass/woofers are on until the crossover frequency to the tweeter (is reached). This design would save cost in the crossover network (fewer components), but this design would not yield a smooth sound power and directivity at a given crossover point. In the 2.5-way design, the lower woofer would be turned off early and the upper woofer would be turned off at crossover point to the tweeter. By doing so, at lower frequency, two woofers are working to produce low frequency, and only one woofer is producing mid-frequency at and near crossover point. At a given crossover point, there is only one woofer working which helps to reduce beaming effect and smooths out the sound power and directivity. This design would cost more since it requires more components in crossover network.”
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