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ScanSpeak Illuminator R3004/6020-00 1″ Tweeter Small Ring Radiator 1″ Soft Ring Dome Ring Neodymium Magnet Patented Symmetrical Drive (SD-2) motor Patented Phase Plug Design Aluminum Face Plate and Housing Sound Transparent Protective Grill Shallow Non Resonant Alu Rear Chamber 61.9mm (2.44″) diameter flange with 21.5mm (0.85″) depth (see drawing below) Excellent choice for both home hi-fi and autosound applications The large-roll surround and textile dome diaphragm provide a flat frequency response to above 30KHz with outstanding off-axis dispersion. The face plates are die cast in aluminum for a beautiful look with maximum mechanical stability. R3004-602000 is optimized to offer small package sizes that can fit into tight spaces such as compact cabinets and automotive trim pieces. The back chamber is die cast in aluminium and designed with a contoured shape that functions as a heat sink in high power applications.