JBL 2225H/2225J (circa 1983)

At 10.1 kg with a 10 cm voice coil and a 13,500 gauss magnetic gap, this is the sound-reinforcement workhorse that powered stages and clubs through the 1980s.

Overview

The JBL 2225H and its 16 Ω sibling, the 2225J, are 38 cm cone woofers built to move air at volume. They were designed for sound reinforcement and ended up in a lot of club installations and touring rigs. At ¥72,000 per unit around 1983, they weren't cheap, but they were used in venues where failure wasn't an option.

The 2225H is rated at 400W allowable input (continuous program) with a 97dB/W/m sound pressure level. That's serious output from modest amplifier power. The frequency band spans 30 Hz to 2 kHz, with a recommended crossover frequency of 1.2 kHz or less. That's a wide window for a woofer, and the corrugated cone paper is what makes it possible. It keeps high-frequency behavior smooth and low in distortion.

The two variants are identical except for impedance. The 2225H runs at 8 Ω, the 2225J at 16 Ω. That makes the J useful for series-parallel wiring in multi-driver arrays where higher impedance strings are needed. Collectors and sound companies bought whichever matched their system topology.

The driver measures 388 mm in diameter and 133 mm deep, and weighs 10.1 kg. The effective diaphragm diameter is 33.7 cm, and the voice coil is a 10 cm unit. Magnetic flux density sits at 13,500 gauss, with a Bl factor of 20.5 T·m. Nothing here was done for home hi-fi cosmetics.

Key Features

SFG Magnetic Circuit with 16 mm Voice Coil

The magnetic circuit uses a low-distortion SFG (Symmetrical Field Geometry) structure. It's a JBL design approach that equalizes the magnetic field across the voice coil's travel. The 16 mm long voice coil takes advantage of this linearity, keeping distortion low even at high excursion. The magnetic gap depth is 0.28 inches, and the flux density of 13,500 gauss provides the motor force needed for high-output sound reinforcement.

Corrugated Cone Paper for Extended Range

The cone's corrugation does more than add structure. According to available documentation, the corrugation of the cone paper provides smooth attenuation and less distortion on the high-frequency side, so the driver can be used at relatively high crossover frequencies. That's why JBL rates it up to 2 kHz, with a recommended crossover of 1.2 kHz or less. In practice, owners report it reaches 1.2 kHz without complaint, though some suggest crossing at 800 Hz if you're running high-powered amps at concert levels. The effective mass of 0.100 kg and the Thiele-Small parameters - Qts of 0.28, Qms of 2.5, Qes of 0.31 - point to a driver optimized for vented and horn-loaded enclosures rather than sealed infinite baffles.

High fo for Flexible Enclosure Loading

The 40 Hz free-air resonance (fo) is relatively high for a 15-inch woofer, and that's deliberate. Because fo is relatively high, flat low-frequency characteristics can be obtained in a small volume bass reflex enclosure as well as horn loading. The recommended enclosure volume spans 84 to 285 liters — roughly three to ten cubic feet — giving system designers real flexibility. Whether you're building a compact vented cab for a club or a horn-loaded monster for a festival stage, the 2225H adapts. The Vas of 175L and SD of 0.089 m² tell the same story: this driver wants to be in a ported box or on a horn, not in a sealed cabinet fighting its own suspension.

Improved Damper for Higher Input

JBL improved the allowable input in the 2225H/2225J by improving the damper. That's the spider, the part that centers the voice coil and provides restoring force. A better damper means more controlled excursion at high power, which fits the 400W continuous program rating. The Pe (max) for continuous sine wave input is 200W, the more conservative thermal limit. Music program material with its dynamic peaks can hit 400W, but a continuous test tone will cook the voice coil at half that. The voice coil inductance is 1.1 mH for the H and 2.2 mH for the J, reflecting the different winding configurations for the two impedances.

Historical Context

The 2225H is a sound reinforcement driver replacing the 2205H. The 2205H was a respected PA woofer, and the 2225H was JBL's answer to the need for more power handling in live sound. Priced at ¥72,000 per unit around 1983, it sat in the professional tier of JBL's catalog, aimed at sound companies and venue installations rather than home audiophiles.

The design is pure 1980s pro audio: ferrite magnets (not alnico), high power handling, and a focus on reliability under sustained abuse. Its performance is typical of standard 100 mm (4 in) voice coil designs with ferrite magnet structures.

Collectibility & Value

The used market for 2225H/J drivers is active, driven by both PA use and home audio enthusiasts who've discovered the JBL pro sound. A pair in excellent condition recently surfaced at $275 each or $500 for the pair, described as like new, flawless, still tight, no slop, no dry rot or damage, with voice coils spot on.

Parts availability is a strong point. The 2225H and 2235H share the exact same basket, so a 2235H recone kit can convert a 2225H into a 2235H. That's a popular upgrade for those wanting the 2235's extended low-end response. One caveat from the field: the 2225H was a good PA woofer in its day, but it's not a good bass guitar speaker.

For home use, owners report the vintage JBL line performs with wonder and accuracy, and the 2225H in a properly tuned enclosure delivers the kind of clean, authoritative low end that made JBL's pro drivers legendary. Just respect the crossover recommendation — a sub-sonic filter and a crossover around 800 Hz to 1.2 kHz will keep the driver happy and distortion low.

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