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ScanSpeak Discovery R2604/8320 1″ Tweeter Ring Radiator Dual Ring Radiator diaphragm (Patent) Wave-guide center plug (Patent) Extended Frequency To Above 40KHz Very Low Resonance Frequency – 500Hz Low Distortion Coated Fabric Diaphragm Rear Chamber Copper-clad aluwire The Discovery series offer traditional design, superior sound, a solid construction, and a wide range of variants. Combining these elements – plus a wealth of technical features and finesses – it gives our customers the possibility of acquiring a tailor-made Scan-Speak solution with very good performance at a reasonable low price point!