Equipment file · Two-way horn-loaded loudspeaker system

Voice of the Theatre A7

Altec Lansing · 1950s

Evidence status · documented

Identity and core specifications are documented; some historical fields remain unavailable.

The A7 was Altec Lansing's compact Voice of the Theatre: a folded bass horn with a [[altec-515|515]] 15-inch woofer and a multicellular horn driven by an [[altec-288|288]] compression driver. It scaled the original Voice of the Theatre cabinets down for smaller rooms, and its high sensitivity suited the low-power valve amplifiers of the time.

Introduced
1950s
Category
Two-way horn-loaded loudspeaker system
Intended use
Smaller cinemas; later clubs, rock PA and monitoring
Production
Altec Lansing, from the 1950s into the 1980s, with a 2004 reissue

Equipment photographs · 1

Altec A-7-500 cabinet with a sectoral horn on top

1 / 1 · Altec A-7-500, the 1959 upgrade of the A7 (FOH Fig. 13)

Altec A-7-500, the 1959 upgrade of the A7 (FOH Fig. 13)·FOH magazine; photographer not credited·Rights retained by the rights holder; reproduced for historical commentary

Period advertising · 2

Scanned period catalogue page naming and illustrating the Altec A-7.

1 / 2 · Altec A-7 original catalogue page — Altec Voice of the Theatre brochure, 1966 (archive catalogue dating; no date printed on selected page)

Altec A-7 original catalogue page — Altec Voice of the Theatre brochure, 1966 (archive catalogue dating; no date printed on selected page)·Altec Lansing Corporation (Altec Voice of the Theatre brochure, 1966 (archive catalogue dating; no date printed on selected page))·Period advertising/catalogue material; copyright retained by the original rights holder; reproduced for identification and historical commentary (fair use).

Why it mattered

  1. 01

    It carried the 1940s Voice of the Theatre design into a size that clubs and bands could carry.

  2. 02

    At about 103 dB sensitivity it became a popular PA cabinet for bars, clubs and touring rock bands in the 1960s and 70s.

  3. 03

    Kennedy's FOH survey describes the 1947 A7 as a compact two-way built around the 515B woofer and 288 driver on an 811B horn, later the choice of local rock bands, and notes the 1959 802 driver and 511A horn combination offered on A7-500 configurations.

Engineering record

Configuration
515 15-inch woofer on a folded bass horn; 288 compression driver on a multicellular horn[1]
Sensitivity
About 103 dB (1 W/1 m)[1]
Size
About 5 feet tall and 180 lb[1]

Original pricing

No reliable period price located

2026 equivalent

Not calculated without a reliable original price.

Public price evidence was not sufficient to publish a defensible original figure.

Use in the field

Widely used as a club and bar PA cabinet by touring rock bands in the 1960s and 70s[1]

Manuals & original documents

Sources

  1. 11947 Altec Lansing Voice of the Theatre SpeakersMix · technical paper · 2006-09-01
  2. 2A2/A4 VOTTAudio Heritage · archive
  3. 3100 Loudspeaker Technologies that Changed Live-Sound History, Part 1 (David K. Kennedy, 6 September 2026)FOH · reference · 6 September 2026

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