Altec A7-500-8
The most common cinema speaker in history, and the reason so many theater stages still have that unmistakable Altec horn sound.
Overview
The Altec A7-500-8 is a horn-loaded speaker system from Altec Lansing's Voice of the Theatre line. It was built for cinemas and large venues where projection and efficiency mattered more than domestic politeness. It carries forward the A-7 design lineage introduced in the late 1930s and refined through the 1940s, and the A-7 system itself is recognized as the most common cinema speaker in history. The Voice of the Theatre series became the industry standard for cinema sound. The A7-500-8 is one of the variants that kept that standard going in smaller theaters and multitrack installations where space was at a premium. The system pairs a 15-inch woofer in a folded horn enclosure with a compression driver on a multicellular horn for the highs. Altec's own documentation lists the components as the 416-8B low-frequency driver, the 802-8E high-frequency driver, the 511B horn, the N501-8A network, and the 828B low-frequency cabinet. That matches what collectors typically find inside original units. The system was built to deliver clean, dynamic sound at high volumes, enough to fill large theaters. One owner reports a pair manufactured in 1976, but the source states plainly that specific production years are not documented. Treat that date as a single data point, not a confirmed production window.
Key Features
15-Inch Woofer in a Folded Horn Enclosure
The A7-500-8 uses a 15-inch woofer loaded into a folded horn rather than a direct-radiating box. That's the core of the Voice of the Theatre approach. Horn loading raises efficiency dramatically compared to a sealed or ported cabinet, which is why these systems can hit theater levels with modest amplifier power. The woofer sits in the 828B cabinet, the full enclosure that gives the A7 its characteristic proportions. Altec's documentation describes the design as "large horn-loaded," and that applies across the A-7 family. The folded horn shapes the low-frequency character and the physical size of the cabinet. It's also why the A7-500-8 is a floor-standing system and not something you'd tuck onto a shelf.
Compression Driver on a Multicellular Horn
High frequencies are handled by a compression driver on a multicellular horn - the sectoral horn design that gives Altec systems their distinctive projection. The 511B horn is listed as the high-frequency horn in the component set. It's the piece behind the "improved high-frequency projection over the A7-8" that Altec's literature claims for this model. The compression driver model number is not consistently specified in available documentation, and collectors note that the high-frequency driver model remains inconsistently documented across sources. Sectoral horns were only available on the A7 variants, so the A7-500-8's horn is a defining feature and not an optional upgrade. The multicellular design lets these systems throw sound across a large room without the narrow, beamy coverage of a single-cell horn.
Component Set: 416-8C, 511B, 1201-8A, 825
The documented component list for the A7-500-8 is the 416-8B driver, the 802-8E high-frequency driver, the 511B horn, the N501-8A network, and the 828B cabinet. The 416-8B is described as the low-frequency driver. In a horn-loaded two-way system, the woofer's job runs well into the midrange before the compression driver takes over. The N501-8A network handles the handoff between the two sections, with a crossover frequency of 500 Hz. The 828B cabinet is the full enclosure that houses the woofer and provides the horn loading. It's a system built around a small number of parts, and original components in good condition are what collectors look for.
Positioning Within the Voice of the Theatre Line
The A7-500-8 sits in the Voice of the Theatre family alongside the A2, A4/A4X, A5X, A7-8, and A8. The A2 is described as the largest Altec Voice of the Theatre system. The A5X is described as a very popular system for medium-sized theaters, using the same active components as the A2 and A4 but with only one bass driver and one high-frequency driver. The A8 is described as a very slim unit designed for use where space is extremely limited. Altec's own documentation notes that the A7-500-8 features improved high-frequency projection over the A7-8, but that both the A7-8 and A7-500-8 are less sensitive and capable of slightly less maximum acoustic output than the A5X. The A7-500-8 was positioned for smaller theaters, or where space was at a premium for multitrack systems.
Historical Context
The A7-500-8 carries forward the A-7 design lineage introduced in the late 1930s and refined through the 1940s. The Voice of the Theatre series became the industry standard for cinema sound, and the A-7 system is recognized as the most common cinema speaker in history. Altec's documentation frames the A7 as the choice for smaller theaters or where space was at a premium for multitrack systems, and notes that sectoral horns were only available on the A7 variants. The system was built to deliver clean, dynamic sound at high volumes, enough to fill large theaters. One owner reports a pair manufactured in 1976, but the source states plainly that specific production years are not documented. A "1947" date also appears near the A7-8/A7-500-8 heading on one reference page, with unclear context. Neither date should be treated as a confirmed production start or end year.
Collectibility & Value
Vintage Altec speakers remain highly collectible, and the A7-500-8 is prized by collectors. One listing shows a price of $1,750, and a pair sold for JPY 398,182. Neither has a date given, so treat these figures as reference points and not current market values. Units described as "fully serviced" have appeared on the market, and some repairs have involved replacement of Radian diaphragms in the 808-8A drivers. The source flags that the high-frequency driver model remains inconsistently documented, so the 808-8A reference should be treated with caution. Yahoo Auctions Japan closed listings for "altec a7" show approximately 69 winning bids with an average price of 91,574, and an alternate search result page shows approximately 67 winning bids with an average price of 88,988. These are search results for "altec a7" and not specifically the A7-500-8, and the currency is implied rather than explicitly stated. A live auction listing for "ALTEC A7-500-8" exists on Yahoo Taiwan with no price shown. A forum thread titled "Price for Altec A7 500-8 ???" asks how much a pair with original cabinets costs, but no answer was captured. One user compared original A7-500-8 to a pair of Klipsch La Scala and found the sound more cohesive and realistic, noting the only thing lacking was the highest frequencies when A/B comparing the two sets. Another poster on Vintage Asylum stated their Klipsch Cornwalls sounded better than the Altec A-7-500-8 in their listening environment.
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