But ceramic tweeters remain an option for all three models

Marten’s newly launched Parker range comprises the Quintet, the Trio and the Duo but because all three models come in two versions – ’Standard’ and ‘Diamond’ – there are effectively six models in the range, with the flagship being the 2.5-way floorstanding Quintet Diamond (pictured above).
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https://www.whathifi.com/news/marten-parker-series-speakers-use-new-crossover-topology-and-diamond-tweeters