Tag Archives | 104h-2

JBL L100 Parts and Repair

The JBL L100 series speaker was the consumer version of the popular 4400 Series Studio Monitors. It remains one of the most popular speakers due to sturdy construction and high quality components which combined to produce great sound. It was so popular that  a number of different versions made. Here are the parts details: new component and repair parts availability.

L100 Century: LE20-1 tweeter repaired with the D8RLE20 diaphragm, LE5-2 midrange (which is no longer available) and uses the C8RLE52 recone kit, and the 123A-1 woofer (which is no longer available) –C8R2212 accordion edge recone kit.
L100A Century: LE25 tweeter repaired with the D8RLE25 diaphragm, LE5-2 midrange which uses the C8RLE52 recone kit, and the 123A-1 woofer (which is no longer available) –C8R2212 accordion edge recone kit.
L100A Century (Late Model): LE25 tweeter repaired with the D8RLE25 diaphragm, LE5-2 midrange which uses the C8RLE52 recone kit, and the 123A-3 (which is no longer available) –C8R2213 recone kit with accordion edge.
L100T: 035Ti tweeter- (no replacement tweeter and no diaphragm for repair), the 104H-2 midrange which is still available brand new and the C8R104H-2 recone kit, and the 2214H wooferC8R2214 recone kit or RFK12 JBL2214 refoam kit
L100T3: 035TIA tweeter which can be repaired with the D8R035TIA diaphragm, the 104H-2 midrange which is still available brand new and the C8R104H-2 recone kit, and the 2214H wooferC8R2214 recone kit or RFK12 JBL2214 refoam kit


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4310, 4311, 4312 Studio Monitors

These JBL Series Studio Monitors were made for recording studios and introduced nearfield monitoring (see definition below) which became a huge hit. Their success led to the creation of a consumer version:  L100 Speakers.

 

4311B: LE25-2 tweeter (no longer available) which can be repaired with D8RLE252, LE5-10 midrange (no longer available) which can be repaired with C8RLE510 recone kit, and the 2213H woofer (available brand new) which uses the C8R2213 recone kit

4410: 035TIA tweeter which is still available brand new and can be repaired with the D8R035TIA diaphragm, the 104H-2 midrange which is still available brand new and the C8R104H-2 recone kit, and the 127H-1 woofer which uses the C8R127H-1 recone kit or RFK10 JBL125 refoam kit

4410A, 4410A-1: 052Ti tweeter which is still available brand new and can be repaired with the D8R052Ti diaphragm, the 104H-2 midrange which is still available brand new and the C8R104H-2 recone kit, and the 127H-1 woofer (which is still available) uses the C8R127H-1 recone kit or RFK10 JBL125 refoam kit

4411: 044 tweeter (tweeter and D8R044 diaprhagm both no longer available), the LE5-9 midrange (which is no longer available) and is repaired with C8RLE5-9 recone kit, and the 128H woofer (no longer available) which uses the C8R128H recone kit and the RFK128 refoam kit

4412: 035Ti tweeter (different from the 035TIA- both tweeter and D8R035TI diaphragm no longer available), the 104H-2 midrange (still available brand new) and the C8R104H-2 recone kit, and the 128H-1 woofer (available brand new) which uses the C8R128H-1 recone kit and the RFK128 refoam kit

4412A, 4412A-1: 052Ti tweeter which is still available brand new and can be repaired with the D8R052Ti diaphragm, the 104H-2 midrange which is still available brand new and the C8R104H-2 recone kit, and the 128H-1 woofer (available brand new) which uses the C8R128H-1 recone kit and the RFK128 refoam kit

4400 Series Brochure ….  4311 Brochure ….  4311 Spec Sheet ….   4410 Spec Sheet  …. 4410 Brochure ….   4410A Spec Sheet ….  4410A-1 Spec Sheet ….   4311B Spec Sheet ….  4411B Brochure ….  4412 Spec Sheet ….  4412 Brochure ….   4412A Spec Sheet ….  4412A-1 Spec Sheet

Wikipedia states: In the late 1960s JBL introduced two monitors which helped secure them preeminence in the industry. The 4320 was a direct competitor to the Altec 604 but was a more accurate and powerful speaker and it quickly made inroads against the industry standard. However, it was the more compact 4310 that revolutionized monitoring by introducing the idea of close or “nearfield” monitoring. (The sound field very close to a sound source is called the “near-field“. By “very close” is meant in the predominantly direct, rather than reflected, soundfield. A near-field speaker is a compact studio monitor designed for listening at close distances (3’-5’), so, in theory, the effects of poor room acoustics are greatly reduced.)

The 4310 was small enough to be placed on the recording console and listened to from much closer distances than the traditional large wall-(or “soffit”) mounted main monitors. As a result, studio-acoustic problems were minimized. Smaller studios found the 4310 ideal and that monitor and its successor, the 4311, became studio fixtures throughout the 1970s. Ironically, the 4310 had been designed to replicate the sonic idiosyncrasies of the Altec 604 but in a smaller package to cater for the technical needs of the time.

The 4311 was so popular with professionals that JBL introduced a domestic version for the burgeoning home-audio market. This speaker, the JBL L-100, (or “Century”) was a massive success and became the biggest-selling hi-fi speaker ever within a few years. By 1975, JBL overtook Altec as the monitor of choice for most studios. The major studios continued to use huge designs mounted on the wall which were able to produce prodigious SPL’s and amounts of bass.  

 

 

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