by erichayes » Tue Apr 29, 2008 7:31 pm
When Jensen first got started back in the 1920s, their model numbers were the cone diameter and a code letter for the voice coil diameter. Since they all used field coils for magnets, there was no prefix code.
When AlNiCo V magnets came on the scene, Jensen added a "P" (for "permanent") prefix to the model number; finally, when ceramic magnets became reliable, Jensen added a "C" designator for their ceramic line.
The four grades of speaker (VC diameter) were R=1", Q=1.25", N=1.5" and K=2".
Thus, a P10Q would be an AlNiCo V 10" speaker with a 1.25" voice coil. In the General Motors Analogy calculator, that would translate into an Oldsmobile.
Eric in the Jefferson State