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This makes the REF407F a practical fit for replacing a factory coaxial speaker pair without adding separate external crossovers
These construction details focus on stable mounting and consistent operation in an automotive environment
Three selectable AUX input gain settings help match the soundbar to different wired source-output levels
and subsonic settings aid system tuning
JBL Club 644F 4" x 6" Two-Way Car Speakers Subwoofers This makes the REF407F aThe JBL Club 644F is a pair of 4" x 6" two way car speakers designed to replace compatible factory installed speakers. It provides a compact upgrade path for vehicles that use this common oval speaker size. With 92dB sensitivity, it is suited to systems powered by a factory radio as well as aftermarket amplification. These speakers handle 40 watts RMS and up to 120 watts peak per speaker. Their 75Hz20kHz frequency response covers midrange and high
