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The Pioneer TS-A879 is a 3.5-inch, 2-way coaxial speaker engineered to deliver an enhanced audio experience in your vehicle. This woofer seamlessly transitions to the 0.98-inch polyetherimide hard dome tweeter, which provides clear and crisp high-frequency reproduction. With a maximum power handling of 450 watts and a nominal power handling of 100 watts, these speakers are capable of delivering dynamic sound. The TS-A879 operates within a frequency range of 52 Hz to 33 kHz (without filter) and 850 Hz to 33 kHz (with filter), offering a wide spectrum of sound. They have a speaker impedance of 4 ohms and an efficiency of 85 dB (1W/1M). Installation requires attention to the mounting depth of 1-3/8 inches and a cut-out diameter of 3 inches to ensure proper fitment. The included in-line filter is a key component for achieving the specified frequency response. As part of Pioneer's A-Series, these speakers share the OPEN & SMOOTH design concept, ensuring they integrate well with other A-Series components for a cohesive sound system.