These speakers use the same mids and tweeters as the Infinity Reference Standard. I bought them from Tech Hifi : o in about 1980. The last time I tried them, one side worked, but the other side had no output from the mids or tweeters. Looks like a problem with the crossover. 12" Watkins dual voice coil woofers. The cabinets are in good shape. There are two sets of grills, but they are really ratty; it will take some effort to create one good set. They are offered here free to anyone who will work on them. And if you can't get them working, you can part out the mids and tweeters for hundreds of dollars. Pick up only; Cupertino.