When you get the Bose 201 Series IV Main/Stereo Speakers, you get a slim bookshelf speaker design packed with power and performance. The compact size makes them ideal for small rooms, and they are easy to mount to your stereo receiver. The 201 speaker system model features the unique 2 1/2-inch stereo targeting tweeters with precision angled drivers that balance sound while the 6 1/2-inch high-excursion woofer brings in the powerful and crisp low notes. The Direct/Reflecting technology reflects audio off walls and other flat surfaces unlike many other devices that concentrate sound into a single area. The Bose Stereo Everywhere speaker performance features extends audio through every inch of space equally and with realistic sound quality.