This photo-essay details the restoration of a pair of JBL L100 Century, and a. Notice the serial number, which was originally on the front as part of the plate at.

Copyright 2011 © Troels Gravesen go to: The James B. Lansing L100 Century loudspeaker, the consumer version of the 4310 studio monitor, became the largest selling loudspeaker model of any company in the Seventies and more than 125,000 pairs were sold. By the end of the decade, recording studios in the United States used more of JBL’s monitors than all other brands’ monitors combined. Due to the materials used, the L100 drivers are as good today as when they were produced, but the overall sound can be vastly improved by modern crossover technology.

The kit is suitable for those JBL variants using the 123A woofer, LE5-2 midrange driver and LE25/LE26 tweeters, e.g. For the 4310 (LE20 tweeter) you need 3 additional components. The crossover is NOT suitable for 4311B, 4312 or 4312B; these have different midrange driver. The L100 Up-Grade Kit is NOT suitable for L166 or any other JBL speaker. Download d2 cd key changer. Mail received 12 August 2011 from Mr.

Jim Barthell, retired Vice-President of Engineering Administration at JBL. I truly admire the work you have done to upgrade the JBL L100 Loudspeaker. It’s sort of like you’ve given an old man a new heart. I am retired now, but I worked in the audio/consumer electronics manufacturing industry for forty years – from 1960 – 2000.

During the 1960’s I was Vice-President of Engineering Administration at JBL. I am not an engineer – but I did direct the L100 development program. L100 Design Engineer Ed May was a very dear and close friend. I coordinated the work of industrial design consultant, Arnold Wolf – who, with Doug Warner, was responsible for the visual design.

Arnold later went on to become President of JBL and my boss. Larry Phillips created maybe the best audio promotion program ever: “Wednesday for Trombones, Thursday for Drums.” Years later, when I was introduced to Mark Levinson engineer, Tom Colangelo – Tom – smiling when he heard about my past JBL work experience, simply smiled and spoke that now famous marketing phrase. The best L100 story “never told” is that of JBL draftsman/audio enthusiast Carl Davis from Ottumwa, Iowa. Ed May told us all that microphone wind screen foam material would make an acceptable grille material. Arnold Wolf gave us stunning designs.

The problem was that the foam industry was basically the packaging and filtering industry. Pressure cutting foam tolerance was about +/-.25 inch. No foam vendor could meet Arnold’s design requirements. Carl Davis, without degree, without assignment and working on weekends – was the first – in the entire industry – to discover that foam could be hot wire cut – and with the required precision. The L100 project had lingered more than six months in limbo while we struggled with the grille design problem. Meanwhile, the L100 market got off to a head start when studios began ordering 50 to 100 pairs of walnut 4310’s. We all knew an unauthorized distribution process was under way.