Pioneer 500W 4" PRO Series Bullet Tweeter: Are You Ready to Go P.R.O.? The Pioneer Reference for Open Show series of speakers is designed specifically for those looking to produce some serious sound pressure levels. Inspired by Pioneer’s history of record-breaking SPL competition, the new P.R.O. series line of speakers is constructed with the street enthusiast in mind. With an emphasis on efficiency and power handling, the P.R.O. series lineup consists of bullet tweeters, mid bass drivers, and a subwoofer that can be mixed and matched to deliver impressive output, without requiring an impressive investment. Tweet This The Pioneer P.R.O. series TS-B400PRO bullet tweeters feature aluminum die-cast chassis with titanium diaphragms backed by aggressive magnets and motor assemblies to produce a wide range of crisp, loud, and clear frequencies with up to 500 watts of maximum power handling. Pioneer TS-B400PRO Features: 500 Watts Max Power (200 Watts Nominal) Titanium Diaphragm and Aluminium Die-Cast Chassis Designed for High Sensitivity and High Power Handling Package Contains 1 Unit Pioneer TS-B400PRO Specifications: Size: 4" Max. Music Power (Nominal): 500 W (200 W) Frequency Response: 3,500 Hz to 27 kHz Sensitivity (1 W/1 m): 106 dB Impedance: 4 Ω Mounting Depth: 2-5/8" Cut-Out Dimensions: 3-3/4"