Bass and midrange units are powered by large Alnico V magnets, whereas tweeters are energised by respectable size ferrite magnets.I patiently waited for a year, and eventually, a set came up on eBay 2h drive from where I live.I made an offer and couple of days later I became an owner of a set of legendary JBL L100A.As expected from 40 years old second hand speakers, they had normal wear and tear marks on the cabinets, slightly pushed in tweeter dust caps and crackling potentiometers nothing that would put me off from buying them.
Because I was redecorating the whole house, these were placed in the attic and not touched until very recently, when I decided to finally test them. Please note prior to this review, I replaced the crackling attenuators with like-for-like l-pads. I also recapped the crossover with basic polypropylene capacitors, as the original ones where slightly out of their tolerances. More details about these upgrades can be found in the upgrades section. Speakers in their original conduction, were unlistenable, mainly due to the poor connection at the l-pads, which caused distorted and breaking sound. You will not get the same sound if you buy them and leave them in original, out of spec condition. In the late 60s JBL already had a great reputation for making very accurate, full size monitors for studios. Growing demand for more compact control room monitor, forced JBL to start working on the 4310 model. The requirements were: high power handling, high acoustic output without distortion and smooth frequency response thought entire audio spectrum all of that from a 45l enclosure. Two years after the work begun, JBL Professional Division introduced the 4310 studio monitors. These speakers quickly became first choice for many well known studios, including Capitol, Deutsche Grammophon, EMI, LondonDecca, RCA, etc. In fact, these monitors became so popular, that many musicians and engineers started purchasing these for home use. This in turn, encouraged JBL to produce the consumer version of these monitors JBL L100. JBL claimed for these to be acoustically identical to the studio equivalents, but finished in more provocative style, appropriate for home environment. And this provocative style is one of the most characteristic features of the JBL L100 speakers the open cell foam grilles with truncated pyramids. I dare to say that these are one of the most iconic speak grills ever made. There are different version of both studio monitors as well as consumer speakers. So what do we have here Well, these are relatively large by modern standards, 3 way bookshelf speakers with a very basic crossover network and all driver diaphragms made of paper. Jbl L100 S Drivers Layout StudioThere is something very appealing about the large white diaphragm and non linear drivers layout studio heritage perhaps The finishing quality of the drivers and attention to details is astonishing. Even these days we rarely see so well made drivers, not to mention 40 years ago.
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