Just bought a pair of 66's and spent the entire weekend cleaning, scraping, sanding, cleaning, painting and finally got these looking as good as they sound. Have hooked these up to a few different Amps they seem to like the stuff from the late 1970's. Currently have wired to Pioneer SX780 and with a mere 55 w per channel sound incredible. Will eventually be wired to Pioneer SX980, just need to do some moving.