The wrong combination of air volume and materials can cause even good speakers to sound tinny or dead. Bose has addressed this problem by including a small air chamber on the back of their 131 speakers, so they'll always sound great. 4 1/2'' ultra durable composite, full-range driver with silicone-rubber surround.

• Impedance: 4--8 ohms 
• Woofer Size: 4 1/2''
• Maximum Watts: 80 per channel 
• No. of Elements: 1
• Fits the pre-cut speaker holes for rear mounting - 5 3/8''D to 6 1/2''D
• Can be front-mounted through a 7 1/8'D' hole
• Measures 12''L x 7 1/8''W x 3 1/2''D
• Sold in pairs