Edge-driven textile tweeters for smooth, clear highs. Oversized Plus One woofers offer more surface area for higher bass output and enhanced midrange performance. Newly engineered baskets are optimized to fit most factory speaker locations. Competitive pricing - Reference speakers provide step-up Infinity sound at mainstream prices. New Reference speakers are designed to deliver Infinity’s signature sound in more vehicles. They feature edge-driven textile tweeters for smooth, clear highs and the larger models offer an adjustable tweeter output level control for high-frequency optimization based on installation location or the listener's preference. Oversized Plus One woofers offer more surface area for higher bass output and enhanced midrange performance. Plus our newly engineered baskets are optimized to fit most factory speaker locations. Harman’s patented (US patent #7,548,631) Plus One cones provide more overall speaker-cone area than other cones in its class — the result is higher sensitivity, increased low-frequency output and accurate music reproduction. Reference speakers provide step-up Infinity sound at mainstream prices.