The JL Audio C1-400x is a 4-inch coaxial speaker pair featuring a 100 mm woofer and a 0.75-inch edge-driven aluminum dome tweeter for improved high-frequency clarity. Drivers use a mineral-filled injection-molded polypropylene cone, rubber surround, a carefully engineered spider and DMA-optimized motor system to control motion and reduce distortion.

Fitment is simplified with breakaway mounting tabs for four-hole or two-hole installation; mounting hole diameter is 94 mm and mounting depth is 46 mm. Sold as a pair; grilles not available. Continuous power handling is 35 W RMS with a recommended amplifier range of 10 to 50 W RMS and a frequency response of 64 Hz to 24 kHz.