The new Reference speakers are designed to deliver signature Infinity sound in more vehicles. They feature edge-driven textile tweeters for clear, smooth highs and larger models offer adjustable tweeter output level control for high-frequency optimization based on installation location or listener preference. Large Plus One™ woofers offer more surface area for higher bass output and improved midrange performance. Plus, our newly designed baskets are optimized to fit most factory speaker locations. Available in a range of standard sizes: 3", 4", 5-1/4", 6-1/2", 6" x 8" and 4" x 6" coax, 6" x 9" 3-way, and 5-1/4", 6-1/2" and 6" x 9" components - the perfect upgrade from your factory speakers..PZA MORE SPECS