The SRS-210W 10-inch high excursion, thin profile woofers. They’re an XT Series exclusive, based on a highly improved version of Sunfire’s renowned High Back-emf design. Improvements include the use of high-strength, rare-earth neodymium magnets which are 5X stronger than conventional ferrite magnets. Their newly designed suspension and inverted surrounds provide uniform travel within the speaker’s ultra-thin design. As a result, the SubRosa yields enormously high output from a cabinet no deeper than the width of a business card! The back box features the slimmest cabinet profile in the industry. It fits in to a standard wall construction with 2-inch x4-inch/16-inch on-center studs. The Gold-plated, spring-loaded terminals simplify installation without compromising performance. And, Sunfire’s Frequency Filtration Design™ (FFD), features a woofer capable of reproducing 10% more information than previous designs. Combined with a newly tuned amplifier crossover network and auto room EQ, the system is matched to produce natural, yet dynamic bass - regardless of whether you’re watching a movie or listening to music.