These speakers are called "System B." They were Jensen's top of the line from about 1978-1982. They had a smaller cousin called System C that was a 10" 3-way like the L-100's. Very good drivers were used. The bottom two were made by Jensen (Rola), the third speaker was Audax from France and the super-tweeter covering freq. above about 12kHz is a Panasonic. The engineer who designed these was very picky (I was his boss). The system was designed to be very flat but unfortunately the bass sounded a little thin compared to speakers like the L-100's that had a 2-3dB bump just above F3. I think I can find a schematic somewhere, no promises. One caution. The front baffle is plastic and when they were manufactured the drivers were held in with wood-type screws. With a high speed screwdriver, the screw would melt the plastic on its way down and basically weld itself in. Don't strip the head if you're trying. I was not in charge of mechanical design or manufacturing and I cringe every time I think of this.
By the way, the picture shows the speaker on a small base. This is sort of the "b" version. When it originally came out, the enclosure was mounted inside an inverted "U" stand that would allow the angle to be adjusted at two or three positions. They were very expensive to make. I think your version was made closer to 1981. I left in 1980.
