Home Resource Center Product Data and Related Literature Beryllium Beryllium Acoustic Material Beryllium Acoustic Material Resources BeX4000 Diaphragm Assembly Available in 8Ω and 16Ω impedances, the BeX4000 series fits a variety of JBL and Radian compression drivers. The BeX features a genuine beryllium dome to reduce mass and ensure unmatched rigidity, a PEEK polymer surround to exend low frequency performance and an aluminum edgewound voice coil with beryllium-copper lead outs. TDS2011 Acoustic Materials Matrix This matrix allows you to compare the critical Physical and Mechanical properties of Truextent® Genuine Beryllium, Truextent AlBeMet®, Truextent Composite Metal Matrix, Magnesium, Titanium and Aluminum. Truextent® brand Acoustic Beryllium Truextent brand Acoustic Beryllium is available in a variety of standard pre-formed dome shapes and sizes. Simple and complex custom shapes can also be supplied in production quantities per customer specification. Our in-house engineering and fabrication capabilities allow us to work with you through the prototyping and pilot stages to supply a final component design meeting your precise performance requirements.