High-mass solid pole piece for removing potentially damaging heat High-temp coil wire Cast-aluminum basket with coil-cooling perimeter venting Durable Spiralead tinsel leads Tough double-stitched, Santoprene surround Handy spring-loaded terminalsImpedance (OHMS) 2 or 4 DVCMax Rec Amplifier Power 2000/1000Sensitivity (dB 1w/1m) 91.6Frequency Response (Hz) 18-500