had a pair of ESS PS 1220 3 ways in the mids 80's. $399 ea as I recall. Not bad for 3 ways, the Heil tweeter is quite the experience, the highs seem to float a bit around walls, etc. The only draw back was the mylar tweeter diaphrams would have a melt down once in a while, and the foam woofer surround and passive were good for 3-4 years max. ESS used to have decent support/ woofer and passive exchange, and diaphrams were only about $20-25, but now are defunct. I finally sold them since they were a bit high maintenance for speakers, despite their surprising well balanced sound for 3 ways. The heil tweeter can be quite addictive!