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It emphasizes the top end crunch of a distorted rock guitar, but rolls off many of the most extreme highs that more efficient speakers can reproduce.
The G12M compresses at volume, which means it produces a blend of low end that feels musical, interactive with the guitar, as well as loose at times.
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.
Many of our reader questions become the basis of new articles written and this is certainly an example of one of those.The 6 digit code indicates what manufacturer made the speaker and when it was made. Here is a list of some of the speaker manufacturers and their EIA codes: So, the speaker in the image above would have been made by Jensen (220) during the 27th week of 1951 or 1961.The year is confusing because it is only a single digit.Sometimes changes were made for reasons of durability, sometimes for cost-considerations, and other times for both reasons.Regardless of these factors, while a G12M 25 watter from these two eras for example will sound different, they still inherently contain the basic characteristic tones and voicing of a G12M.
There are also a plethora of other topic areas that we could cover in the future that go into depth about calculation of speaker and cabinet design, magnet types, cones, and how they each impact tone.