JBL 2290 (c. 1976)

A 38 cm cone-type passive radiator designed to add low-frequency impact in sealed enclosures paired with 2205 or 2215 woofers

Overview

The JBL 2290 is a passive radiator for high-output bass in large sealed enclosures. It was made around 1976 and built to work with JBL’s 2205 or 2215 woofers. It adds dynamic range and impact to frequencies below 150 Hz. There is no vent. The bass extension comes from a cone assembly tuned by its mass and compliance. It was used in systems like the JBL L220. Japanese pricing was ¥18,100 per unit around 1976.

Specifications

Diameter	38 cm
Depth	8.6 cm
Weight (packed)	1.6 kg
Model rating type	38 cm cone type passive radiator
Combined speaker	2205, 2215
Recommended enclosure volume	142L ~ 227L

Design

The 2290 is a paper cone and frame assembly with carefully adjusted mass and compliance. It has no motor and no voice coil. The cone resonates in response to pressure inside the cabinet, so it works as a tuned mass-spring system. In a sealed enclosure it adds to the bass output by coupling low-frequency energy into the room.

Context

JBL designed the 2290 for use with the 2205 or 2215 woofers. It went into the JBL L220 system, one of the larger speaker designs of the mid-1970s.

Market

Recent listings show the JBL 2290 selling between $115 and $157, with units described as in excellent condition. The original price was ¥18,100 around 1976. Vintage audio builders and restorers are still buying them.