The speakers were a variety of horn-loaded systems named the "Ezekiel" series after the designer, Harry Ezekiel Harris. By 1969 they were in search of expanded production facilities, and came upon Aztec Sound, located about 15 minutes South and West of downtown Denver. The owner was Jerry Nichols, and the product line consisted of conventional cone speakers in enclosures ranging from small bookshelf to huge floor models. All were named after famous artists. The cabinet work was quite nice, the company had a very well developed production line, a full time in-house designer, and the speakers sounded...well, o.k... decent relative to commercial standards at that time.
Later that year Loudspeaker Design, along with friend Kan Kanzler of Atlantis Sound, did a stock trade and acquired a sustantial percentage of Aztec Sound. Part of the deal included a provision that they would redesign and improve the Aztec products using cone drivers, but would not use any horn drivers or any of their proprietary horn designs. Their speakers used horn midrange and tweeters, and front/back loaded cone drivers as woofers.
The Aztec products from late 1969 reflected the Harry Harris design improvements. In late 1970 I left to pursue my real passion, Ferrari automobiles. The relationship between Loudspeaker Design and Aztec soon ended, Harry Harris developed a new range of limited production boutique speakers that did not use horns, and it appears that Aztec "borrowed" some of our secrets and began to use horns in their systems. The horns were manufactured by Herald, located in Gray's Lake, WI. If you remove one, look at the back of the driver and see if it has a foam cap. The midrange and tweeter horns were very inexpensive, but sounded quite nice.