JBL LE20 Tweeter

Name: JBL LE20 Tweeter
Brand: JBL

1970-1972

Born in the golden era of American hi-fi, the JBL LE20 was the spark plug of the legendary L100 Century. This tiny 1.5-inch cone tweeter didn’t just handle the highs—it gave the L100 its voice, delivering a crisp, present, and unmistakably lively top end that cut through with clarity and character. No sterile sheen here: this was high-frequency reproduction with attitude.

Specifications

Type	Cone tweeter
Nominal Diameter	1.5" (38mm)
Magnet Type	Alnico V
Voice Coil	0.75" (19mm)
Cone Material	Treated paper
Impedance	8 Ω
Frequency Response	7.5 kHz - 15 kHz
Crossover	7.5 kHz (in L100)

Key Features

Cone Design: A compact paper cone engineered for high efficiency and quick response
Alnico Magnet: The Alnico V motor system delivers speed and dynamic punch, contributing to its vivid, immediate sound
Simple Crossover: Paired with a straightforward 7.5 kHz crossover point in the L100’s 3-way design for seamless integration

Applications

L100 Century (original version, 1970-1972)

Historical Context

In 1970, JBL wasn’t chasing the dome tweeter trend. Instead, they doubled down on their cone heritage with the LE20—a small but mighty high-frequency driver built for presence and punch. While domes would eventually dominate for their smooth dispersion and extended highs, the LE20 carved its niche with a raw, forward character that many audiophiles still describe as “alive.” It wasn’t about neutrality—it was about energy, immediacy, and a touch of rock-and-roll flair.

By 1972, the LE20’s run was over. It made way for the LE25 in the updated L100A, a tweeter with broader high-frequency reach and a more refined top end. But for collectors and vintage purists, the LE20 remains the authentic voice of the original Century—rare, sought-after, and full of vintage soul.

Related Drivers

LE25 - Successor with extended response

eBay Listings

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Documentation

Lansing Heritage - Comprehensive JBL specifications, photos, and historical documents
HiFi Engine - JBL manuals, service documents, and brochures
Audio Karma JBL Forum - Community discussions and restoration guides