Why it mattered
- 01
With the 555-W it made talking pictures intelligible in large theatres.
- 02
It set the template for the large folded theatre horns of the early 1930s, such as the [[western-electric-15a|15-A]].
Engineering record
- Dimensions
- 45 × 45-inch mouth, 11-foot folded exponential path[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
No named deployment could be tied to this exact item by a checked source yet. Know of one? Suggest it on the contribute page.
Manuals & original documents
No authoritative manual or original document has been located for this profile.
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Know more about 12-A horn?
Corrections, firsthand information, original documents, and credited photograph sources are welcome.