4311

About the 4311

The JBL 4311 is a three-way, bass reflex studio monitor loudspeaker system developed in the 1970s, designed for professional control room installations, small studios, mixdown facilities, broadcast monitors, and portable playback systems. It features a 300 mm (12 inch) long excursion low-frequency woofer (JBL 2213H), a 130 mm (5 inch) midrange cone driver (JBL LE5-10), and a 36 mm (1.4 inch) high-frequency direct radiator tweeter (JBL LE25-2). The system includes a matched frequency dividing network with front panel controls for midrange (presence) and high-frequency (brilliance) output, allowing tonal balance adjustments to suit various acoustical environments. The 4311 offers a frequency response of 45 Hz to 15 kHz ±3 dB, a sensitivity of approximately 91 dB at 1W/1m, and an impedance of 8 ohms. Its distortion is inaudible even at high power levels and very low frequencies, delivering clean, crisp, and lifelike sound reproduction with powerful bass fundamentals. The enclosure is compact, measuring approximately 23" x 14" x 11" (60 x 36 x 29 cm) and weighing about 42 lbs (19 kg) per speaker. The finish options include textured gray or oiled walnut with a black fabric grille. The 4311 remains a highly regarded vintage monitor speaker, prized for its natural and undistorted sound.