Altec Lansing MRII564 (c. 1980?)
A lightweight, miniaturized manta ray horn designed for directional sound control from 500 Hz to 16 kHz
Overview
The Altec Lansing MRII564 is a manta ray horn used in professional audio applications. It’s part of the MRII series, engineered to deliver controlled directivity while being compact and lightweight. This horn inherits the core performance characteristics of the larger MR64A model but in a smaller form factor. It requires no throat and is designed to pair with specific compression drivers: the 288, 290, or 291 models.
Specifications
| Type | Manta ray horn |
| Directional property | 60° x 40° |
| Crossover frequency | 500Hz |
| Applicable throat | No throat required |
| Compatible Driver | 288, 290, 291 |
| Power level (for compatible drivers) | 288: 112dB/W/m, 124dB/15W/m; 290: 110dB/W/m, 130dB/100W/m; 291: 111dB/W/m, 127dB/40W/m |
| External Dimensions (without Screwdriver) | Width 324 x Height 327 x Depth 317 mm |
| Weight | 2.3kg |
| Accessories | Horn Mounting Bracket (Sold Separately) |
Design
The MRII564 is constructed from lightweight and robust FRP (fiberglass-reinforced plastic), contributing to its durability and portability. It expands the frequency range for directional control up to 16 kHz, operating effectively from 500 Hz. Designed as a miniaturized version of the MR64A, it maintains high performance in a more compact enclosure.
Context
As part of the MRII series, the MRII564 was developed to offer the acoustic performance of earlier Altec manta ray horns in a smaller, lighter format. It directly inherits the fundamental design and output behavior of the MR64A, making it a scalable solution for sound reinforcement systems requiring precise coverage.
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