Replacement Driver Yorkville 7527 1" 40 Watt Compression Bolt-On Driver 8 Ω For NX55P Yorkville compact and versatile 7527 1" high frequency driver with 4 Bolt-On mount is the result of the companys extensive experience, and its commitment to rigorous technical analysis. The drivers advanced non-metallic PETP diaphragm provides accurate, non-fatiguing response, while offering a higher level of durability than shatter-prone metallic domes. Celestions new drivers are in great demand by popular loudspeaker system manufacturers, and after a single listen to the it will be easy to understand why! Features: 1" exit, ferrite magnet compression driver with 1.75" edgewound copper clad aluminium voice coil 40W rms power handling (AES standard) and 106 dB sensitivity Finite Element Analysis (FEA) techniques used to optimize both magnetic and acoustic components One piece PETP diaphragm and surround Recommended 2,200 Hz 12 dB/octave crossover makes this driver suitable for both 2 way and 3 way designs.