JBL 4425 (1985–1998)

A constant directivity studio monitor using a Bi-Radial horn, designed for professional audio environments.

Overview

The JBL 4425 is a 2-way, bass reflex speaker system built as a studio monitor with constant directivity characteristics. Manufactured by JBL, it was first released in 1985 and remained in production until around 1998, when the MKII version appeared. Marketed as a "Bi-Radial Studio Monitor," it was engineered for accurate sound reproduction in professional settings. The system uses a bookshelf form factor but is designed for serious monitoring applications, not casual listening. A brochure dated 1993 confirms its presence in JBL’s lineup well into the 1990s. The 4425 was succeeded by the 4425 MKII, which carried a price of ¥195,000 around 1998.

Specifications

Product type	speaker system
System type	2-Way, 2-Speaker, Bass Reflex System, Bookshelf Type
Low band unit	30 cm Cone Type (2214H)
High range unit	Horn Type (2416H + 2342)
Frequency characteristic	40 Hz to 16 kHz ± 3 dB
Directional (-6 dB, 1.25 kHz to 16 kHz)	100° × 100°
Impedance	8 Ω
Output sound pressure level	91 dB/W/m
Allowable input	200 W (continuous program)
Peak input	1 kW (<10 ms)
Crossover frequency	1.2 kHz
Enclosure volume	53.8 L

Market

The original JBL 4425 launched in 1985 at ¥250,000 per unit and saw gradual price reductions over time, dropping to ¥210,000 by 1988 and ¥150,000 by 1998. The MKII version was priced at ¥195,000 around 1998, indicating a premium but slightly adjusted market position in its final years.