Assertion: beryllium | /r/ObjectUse | used in tweeter
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Source sentences:
text: Beryllium has also been used in tweeter and mid-range audio loudspeaker construction by companies like Brush Wellman - Electrofusion Products and Focal-JMlab (on its flagship Utopia Be series) as an alternative to titanium and aluminium, largely due to its lower density and greater rigidity.