Infinity Primus 693C Primus Series 6″x9″ 2-Way Component Speaker System, Pair Harman��s patented Plus One cones provide more overall speaker cone area (up to 35%) than other cones in its class Infinity Primus speakers are engineered with edge-driven silk dome tweeters which expand the high-frequency range and ensure you’ll hear all the natural detail of your favorite tunes. Infinity Primus speakers feature a compact design for easy installation in tight spaces, allowing them to fit into more vehicles without the need for modifications and cutting. The super-rigid vented baskets help to cool the voice coils making for a reliable speaker. They provide a real world benefit by wicking heat way from the motor structure almost like a fan as the cone moves through its stroke. Infinity Primus speakers are carefully tuned to ensure each line has the consistent Infinity sound signature.