JBL L20T (1985-1987)

A 2-way, 2-driver bookshelf speaker system from the mid-1980s.

Overview

The JBL L20T is a compact bookshelf speaker produced by JBL between 1985 and 1987. It functions as a 2-way, 2-driver loudspeaker system.

Forum discussion identifies the unit as the consumer version of the 4406 studio monitor. Listings describe the system as "monitors" or "speakers." One contributor noted that the L20T "kick[s] major butt!"

Specifications

Sensitivity	87dB (2.83V input, 1m)
Power Capacity	100W (continuous program)
High Frequency Driver	O35Ti 25mm (1″) Titanium Dome
Low Frequency Driver	115H-1 165mm (6.5″) Polypropylene Cone
Crossover Frequencies	3,000 Hz
Dimensions (WHD)	9.38 x 14.75 x 8.25 inch / 238 x 375 x 210 mm

Design

The unit uses a crossover frequency of 3,000 Hz. The low-frequency driver is a 6.5″ Polypropylene Cone, and the high-frequency driver is a 1″ Titanium Dome.

Context

Reviewers noted the sound was "Thin and relatively cold sounding" with "Good attack for the size." Another blog post mentioned that refurbished L20T units were partnered with a T-amp to great effect.

Market

Vintage listings have listed the speaker for prices ranging from $125.00 to $250 ONO. One Reddit user asked $150 for a unit. Common restoration threads suggest light restoration is often required for thrift finds.