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[XLS Encore with supertweeter] This Looks Like an Upgrade. It Isn’t.

"In this video, I take a perfectly well-behaved pair of X-LS Encores, add a super tweeter, and measure exactly what happens to the response. The results are not subtle. Peaks, dips, phase interaction, and some pretty wild changes in the top end show just how easy it is to create more problems than you solve when two high-frequency drivers are asked to play together without proper integration."