Bowers & Wilkins' tweeter on top technology has two benefits. It avoids the situation with normal cabinet construction, where sound waves from the tweeter not only radiate towards the listener but also travel along the baffle surface towards the cabinet edges. When sound waves meet sharp cabinet edges they re-radiate (a process known as diffraction) and, due to the time delay, interfere with and time-smear the sound coming directly from the drive unit. Having the tweeter separate from the main cabinet also allows its time-alignment with the midrange driver to be finely adjusted so the two outputs add perfectly in phase through the crossover region.
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