JBL 4325 (Late 1970s)

The JBL 4325 is a compact two-way professional studio monitor from the late 1970s, built as a smaller alternative to the larger 4311/4312 series for nearfield use in small control rooms. It pairs a 12" woofer (E120 in early production, 2202H later) with a 1" compression driver on a horn (2418H or 2425H depending on the run), all in a sealed acoustic-suspension cabinet. The sealed design means tight, controlled bass — but owners note it gives up low-end extension compared to ported rivals. It was positioned in JBL's 4300 series between the 4312 above it and the smaller 4313 below.

Two finishes existed under the same model number: a professional version in black textured finish with dual input terminals for bi-amping, and a consumer version in walnut veneer with a single pair of binding posts. The consumer version shares its drivers with the JBL L40. Cabinet dimensions are 24" H × 16" W × 13" D, and each speaker weighs 55 lbs. Sensitivity is commonly cited around 90–92 dB, nominal impedance is 8 ohms, and the system is rated at 50W continuous / 100W peak with a maximum SPL of 108 dB. The crossover is passive, 12 dB/octave Butterworth, at roughly 1.2–1.5 kHz depending on the source.

Reception among vintage enthusiasts is generally positive — owners praise the 4325's clarity and flat response — though the 2418H horn driver is sometimes described as harsh or aggressive compared to later JBL horns. The 4325 saw heavy use in recording studios through the 1980s as a nearfield monitor, competing with the Yamaha NS-10M and Auratone 5C. Studio Sound (December 1972, p.47) covered the broader 4300 series during this period, noting the 4320's dimensions and pricing, which places the 4325 within JBL's professional monitor lineup of the era.

No original MSRP or exact production years have surfaced in the available documentation. Common issues today include crossover capacitor failure, foam surround rot on the woofer, and horn diaphragm availability. Recapping is routinely recommended. Used pairs typically sell for $400–$800 depending on condition.

Known Specs

Type: Two-way, sealed (acoustic suspension)
LF: 12" (E120 early / 2202H later)
HF: 1" compression driver on horn (2418H / 2425H)
Dimensions: 24" H × 16" W × 13" D
Weight: 55 lbs (24.9 kg)
Impedance: 8 ohms
Power handling: 50W continuous / 100W peak
Max SPL: 108 dB
Inputs: 1/4" phone jack and binding posts (pro version has dual terminals for bi-amping)