![]() ![]() ![]() The next number is the year of manufacture and the last two numbers will be the week of manufacture. The first three numbers will be 220 which denotes the manufacturer as Jensen. On the edge of the speaker where the mounting holes are there will be a six digit number. This process of generating parameters from a target response is known as synthesis.Īlthough the American company is long out of business, “reissue” guitar speakers are currently made in Italy by SICA Altoparlanti and distributed in the United States by CE Distribution. Thiele/Small parameters (commonly abbreviated T/S parameters, or TSP) are a set of electromechanical parameters that define the specified low frequency performance of a loudspeaker driver. On 4 digits date codes, the 1st and 2nd digits are the last two digits of the year. In 3 digit dates code, the 1st digit is the last digit of the year. The remaining 3 or 4 digits are the date code. The first 3 digits on a pot, or the first 2, 3 or 4 digits on a speaker are the source or manufacturer code. The “67” tells you that the speaker was built by Eminence, the “01” indicates that the speaker was built in 2001, and the “12” means it was built the 12th week of the year.
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