強大的 Altec Lansing “劇院之聲” A1 揚聲器系統，1945 年產品目錄。
Altec A1 影院揚聲器尺寸為寬 3.2 米 x 高 3 米 x 深 1.2 米，重約 1000 公斤（1 公噸）。
這些尺寸體現了其作為大型專業級揚聲器系統的設計概念。
Altec A1 是一款專業揚聲器，由 Altec Lansing 公司於 20 世紀 40 年代初期開發，並於 1945 年發布，旨在服務日益增長的影院市場。它是一款基於早期 Shearer 號角設計的大型兩分頻系統，配備多個驅動單元和號角，可為影院提供高保真音效。
A1 以及其他「劇院之聲」系列型號，如 A2、A4 和 A5，是奠定 Altec 高品質專業音訊聲譽的基石產品，之後該公司於 20 世紀 50 年代末期進軍消費市場。
The Altec A1 cinema speaker measures 3.2m wide x 3m high x 1.2m deep and weighs approximately 1000 kg (1 metric ton). These dimensions reflect its design as a very large, professional-grade loudspeaker system
Altec A1 was a professional loudspeaker developed in the early 1940s, released in 1945 by Altec Lansing to serve the growing cinema market. It was a massive two-way system based on the earlier Shearer horn design, featuring multiple drivers and horns to produce high-fidelity sound for theaters.
The A1, along with other “Voice of the Theatre” models like the A2, A4, and A5, was a foundational product that established Altec’s reputation for high-quality professional audio before the company expanded into the consumer market in the late 1950s.