Acoustic Audio 151B Indoor Outdoor 2 Way Speakers 1200 Watt Black 2 Pair Pack 151B-2Pr Acoustic Audio 151B indoor or outdoor black weather resistant speakers, recommended power is 20-600 watts per pair, frequency response is 37Hz-20 kHz, efficiency is 98dB, 8ohm 4" silver CD woofers with butyl rubber surrounds, .5" ferro fluid cooled mylar dome tweeters, weather resistant design, mounting brackets and hardware included Quick release spring loaded wire terminals, heavy duty ABS construction sealed cabinets, each speaker size (HxWxD) is 7.5"x5.5"x5", designed and engineered in the USA, full instructions included Use for surround sound, home theater, multiple room systems, industrial sound, bookshelf, bathrooms, kitchens, car audio, marine audio, pools, spas, yards, decks This listing and price is for 2 pair / 4 indoor or outdoor speakers