The iconic Klipschorn is the original, three-way, fully horn-loaded loudspeaker that laid the foundation for the Klipsch brand. Long in production, the A7 had several variations and it can be confusing. The photo below is from 2014. Altec A7 Background Info A word about the A7, even if I am not an Altec expert. Most amazing is that you can buy it today. In other words, they are never going to sound like A7's or K-horns. They were fitted with Western Electric 713A compression tweeters and 12-inch JBL or Jensen woofers. Considered a watershed industry event, the introduction of the Klipschorn set the standard for high sensitivity, wide dynamic range, low distortion, and smooth frequency response. Quite similar to its more expensive brother A5 (see brochure at end of article for comparison,) the A7 is called the "baby" Voice of the Theater. The Klipschorn was such a revolutionary speaker, it can still hold its own with some of the best of today’s home theater speakers. The goal would be to become THE go to Altec A7 mod guy. The K-horns play so deep, down to 20 cycles, that you don't need a sub. By definition, then, the one on the left is an A7 type. These should only be used with tube amplification. Something that needs to be mentioned is that the Altec A5, A6 and A7 use the same main cabinets, the 828. It was the first “absolute sound.” Imagine the sound of a windup Victrola being replaced overnight by the sound of unamplified live instruments in space. Altec A7s are plentiful and very few haven't had some work done on them at some point in time. Sectoral horns only available for the A7's. The difference between A5 and A7 is the HF horn: the former uses one of the multi cells, the latter the sectoral type horn. A Klipschorn provides a detailed wall of sound that emanates from the corner of a room. Altec Lansing's A7 speakers were hot shit in the 1950s through the 1970s. I have a pair of their legacy La Scalla's and they are even more efficient than the Altec Lansing A7's. Commonly called a corner-horn speaker, the remarkably uncommon Klipschorn includes a highly efficient horn-loaded tweeter and midrange compression driver. Paul W. Klipsch founded his company in 1946 in Hope, Arkansas, and built his first 12 Klipschorn speakers in 1947. Voice of the Theatre A7-500-8 For smaller theatres, or where space is at a premium for multitrack systems, the A7 is the choice. I considered two potential choices, the A5 and A7-500 'Voice of the Theatre' models, as they seemed the most likely to be successfully tamed for a smaller home listening environment, as the Altec Lansing product literature of the day said, the A5 (and A7-500) were designed "to meet the needs of today's smaller, multiple theatres. Altec-Lansing’s A7, Bozak’s Concert Grand, the Klipschorn, the James B. Lansing Paragon and EV’s Patrician (using a 30” driver) were among the best of the best. That’s 60 years of advancement in one moment. The A7-500-8 features improved high-frequency projection over the A7-8, but both are less sensitive and capable of slightly less maximum acoustic output than the A5X. Altec Lansing A7 The Voice of The Theatre - speaker overview and full product specs on CNET. If I had your skills and knowledge, I'd trick them out to the max and then demo them at an audio show. They are even more efficient than the Altec A7's, which have a maximum efficiency of 103dB. Luckily, this was in the very early days of stereo, so only one of these giant speakers was needed for your hi-fi music system.
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