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Altec 511b horns - $300 (Charleston)
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Height: 10-⅝ inches (27.0 cm)
Width: 23-⅝ inches (60.0 cm)
Depth: 18-½ inches (47.0 cm)
Additional Key Specifications:
Weight: 17-¾ pounds (approx. 8 kg)
Material: Cast aluminum
Mounting: Features a front-mounting flange
Lowest Recommended Crossover: 500 Hz
Coverage Pattern: 90° Horizontal x 40° Vertical
These measurements are standard for the 511B, which is famously known for being the standard horn in many Altec "Voice of the Theatre" systems.