This page is a collection of odds and ends information relating to speakers and speaker implementation. You might find some of the information useful in determining which speaker would be best suited to your application. Speaker Codes And What They Mean The picture is a section of the basket rim of a speaker. The 6 digit code indicates what manufacturer made the speaker and when it was made. It is called the 'Manufacture Date Code'. Here is a list of some of the speaker manufacturers and their EIA codes: Credence 117 Plye 1098 Rola 285 Eminence 67 CTS 137 EV 649 Oxford 465 Altec/Lansing 391 Utah 328 Quam 270 Jensen 220 Weber 1279 Cleveland 433 So, the speaker in the image above would have been made by Jensen (220) during the 27th week of 1951 or 1961.

AFAIK, serial numbers don't really help and there are no date codes stamped on the speaker like other manufacturers do. Try the site below for lots of JBL information, history, models, etc. There also used to be some specs for vintage JBLs on the Jblpro.com site.

The year is confusing because it is only a single digit. In later years, the EIA converted to a 4 digit date code so the year could be easily identified. There are 2 acceptable methods of displaying the EIA date code, with or without a hyphen between the manufacture code and the year/week code. Some manufacturers also attached other letters to the end of the date code to indicate day of the week, work shift, serial number, lot number, etc.

The EIA only specifies manufacturer and year/week code. Anything else is at the discretion of the manufacturer. Speaker Implementation and Amplifier Configurations If you would like to add some info to this list, (any company, any model) feel free to write us with the info. Amp Model Amp Config Speaker Configuration Replacement Speakers Ampeg Gemini I '64-71 2-7591 Cath Bias 20W 1-12', 8 Ohm Jensen C12Q, C12N Jensen EM1201 JBL D-120F 12A125, 12F125 12A150, 12F150 Ampeg Gemini II '65-71 2-7591 Fixed Bias 30W 1-15', 8 Ohm Jensen C15N, EM1500 or EM1502 JBL D-130F 15A150, C15N Ampeg Super Echo Twin '63-64 4-7591 Fixed Bias 30W mono 15W per side 2-12', 8 Ohm Jensen C12Q or EM1201 12A125, 12F125 Ampeg B15N '61-67 2-6L6 Cath Bias 25W 1-15', 8 Ohm Jensen C15N Cleveland, CTS sq mag. Altec, JBL D-130F 15A150 for guitar Bass15F for bass Ampeg B15N '67-79 2-6L6 Fixed Bias 30W 1-15', 8 Ohm Jensen C15N Cleveland, CTS sq mag.

JBL Model 4311 B control manager James B Lansing sound Inc. Northridge California USA with stands one of the speakers has some damage to the lower left-hand corner but they’re in otherwise good condition cosmetically very good condition sonically there is some white spray on the speaker grills but they are all intact with no snags or tears. Shipping estimate maybe less based on your location to the Midwest. They are available for free local pick up in southwest Michigan two hours from Chicago three hours from Detroit four hours from Indianapolis. These are very sought after jbl decade 36. As seen it the pics.

The item are used and need work. The woofers need refoamed as seen. The cabinets have scratches. Chips and water marks. They comes as pictured. I tested them and the highs were very clear. The woofers did work but needed the refoam the quality was as expected The items are sold as is.

Parts or repair. The items will be shipped in separate boxes.

Tenkici games. So the shipping quote is for one box. So basically your shipping cost will be doubled for what you are being shown for a calculated shipment. I will send an invoice with total shipping cost. Up for Sale is A Pair of Vintage JBL L15 Monitor Bookshelf Speakers Pair USA 70s.

All Original and Excellent Condition As Show. Work and Sound Excellent as They Should. Foam Surrounds Still Intact But Getting Dry and Will Need to Refoam in Future. One Grill is Darker than Other One.??? Email or Text It will be Carefully and Prefessional Packing by Me with Styrofoam Sheets.