First the connector. They are xlr balanced connectors. There is an input and an output for daisy chaining speakers.
An xlr connector is a lousy speaker connector, because the pins are too small and burn up. I think you can see burning on one of the pins.
There never has been a standard for speaker connections, despite numerous attempts. The best are Neutric speakers connectors. If you plan on using the speakers, then I would replace them with Neutric speaker connectors.
The Jaguars are part of the the
Tannoy Wildcat series from 1984. I think those speakers were produced from 1984 through 1987.
The driver is a Tannoy 3809 Puma. This driver is a version of the Tannoy Gold 15" Dual concentric. It was designed for a relatively small cabinet.
These speakers were designed for sound reinforcement for bars, lounges etc, and for small band reinforcement.
As you can see the driver has a corrugated surround and yet will have to operate to the 1200 Hz range. So expect a very lumpy bumpy response from edge reflections and lots of cone break up. I would imagine F3 is somewhere around 60 Hz, but that is just a guess.
You can find out all about
Tannoy vintage speakers on there website.
Unless you are planning to use these speakers for the application intended, then I would sell them.
There is a bloke on eBay trying to get $2,500 for a pair. He has interest with an off of $3000.00 including shipping.
If the cabinets are in poor shape, the drivers are worth about $750 a piece. So that was quite a gift.