Passive bookshelf speakers - Connect directly to your amplifier or receiver with these passive bookshelf speakers. Use standard speaker wire to connect the P17 passive speakers to your receiver or amplifier.Great for Front, Center, or Surround Speakers - These passive speakers come as a pair perfect for front placing speakers or rear speakers in a surround sound setup. Located on the back of the speaker is a wall mount allowing you to adjust the position just the way you want it. When you purchase these speakers you receive 2 in one box.Silk Dome Tweeters and Nomex Diaphragm Drivers - The P17 passive bookshelf speaker uses a ¾-inch (19mm) silk dome tweeter that provides accurate high frequency response. As well as, a 4-inch (116mm) Nomex diaphragm driver that delivers optimal low-frequency response. The front facing bass reflex port supplies an additional bass kick adding life to your audio.