I suspect that the new Eidolon Diamond challenges the performance of the Sentinel at a much lower price. I know Avalon is installing the new Accuton diamond diaphagm tweeter in new Sentinels. In comparison to the Eidolon though, the Eidolon Diamond has many more changes than simply a new tweeter- it really is an entirely different product. The only commonality between the two speakers is the midrange driver. I'm not sure if Avalon is doing any wholesale reengineering of the Sentinel beyond the tweeter upgrade.
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