The Pioneer Reference for Open Show series of speakers are designed specifically for those looking to produce 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. The TS-B401PRO 4" High Efficiency Bullet Tweeter features 600 W Max Power (300 W Nominal) handling, a titanium diaphragm, and an aluminum die-cast chassis designed for high sensitivity and high power handling. TS-B401PRO sold individually (each, not a pair).