K Series Features Tour
AxisymmetricalThere are a few basic concepts that guided the design of the K Series waveguides and helped achieve its overall impressive sound quality. First is the understanding that the best, most natural performance in a horn is achieved by avoiding parallel surfaces and abrupt changes in contour. Either will cause phase and acoustical impedance problems that lead to erratic frequency response.
Second, while a waveguide with a large difference between horizontal and vertical coverage angles may be needed for specific applications, it will necessarily exhibit compromised audio performance. For K Series, the horizontal and vertical coverage angles are identical.
Finally, the mouth (opening) of the waveguide should be approximately the same diameter as the woofer. In speakers where that isn't the case, it's likely that either the crossover frequency is too high or the waveguide isn't really controlling the pattern all the way down to the crossover frequency. Either of the above will lead to lack of pattern control in the critical mid-range.
By keeping these concepts in mind, QSC created the large, well-behaved, conical waveguide found on K Series. The sonic benefits, both on and off axis will be clear when you listen for yourself.