4350A

About the 4350A

The JBL 4350A is a vintage, large 4-way studio monitor speaker system released around 1975. It features two 15-inch (38 cm) cone woofers (model 2231A) for low frequencies, a 12-inch (30 cm) cone woofer (2202A) for mid-low range, a horn-type midrange driver combining an acoustic lens (2308), exponential horn (2311), and driver (2440), and a horn-type tweeter (2405) for high frequencies. The system uses a 2-channel multi-amp drive with a crossover frequency at 250 Hz, requiring optional channel dividers and filter boards for full bi-amp operation. The tweeter volume is adjustable via a front panel attenuator, and the tweeter and horn drivers can be swapped left to right for optimal sound staging. The enclosure is a bass reflex design with separate acoustic chambers for the woofers and midrange, finished in gray with a black grill. It has a frequency response from 30 Hz to 20 kHz ±3 dB, sensitivity of 95.5 dB, and can handle 200W RMS below 250 Hz and 100W RMS above 250 Hz. The speakers weigh approximately 110 kg each and measure 1210 mm wide, 889 mm high, and 508 mm deep. The 4350A is highly regarded for its dynamic mid-bass impact and high SPL capability exceeding 126 dB, making it a pinnacle of vintage JBL monitors. The drivers use Alnico magnets and original JBL OEM components. The system originally sold for around ¥800,000 per unit in the late 1970s. It is no longer manufactured but remains a sought-after classic studio monitor.