Scan-Speak Discovery R2604/832000 26mm Ring Radiator 4ohm, Ferrite Magnet, Chamber 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! - Extended Frequency To Above 40KHz - Very Low Resonance Frequency - 500Hz - Low Distortion - Dual Ring Radiator diaphragm (Patent) - Wave-guide center plug (Patent) - Textile Diaphragm