Altec Lansing MRII5124 (c. 1980)
A lightweight FRP manta ray horn from Altec Lansing’s MRII series, designed for high-directivity sound projection with compatible drivers.
Overview
The Altec Lansing MRII5124 is a manta ray horn, also referred to as a "Mantalehorn," part of the MRII series. Built around 1980, it uses a lightweight and robust fiber reinforced plastic (FRP) construction for durability and ease of mounting. It requires no separate throat and is designed to work specifically with Altec drivers 288, 290, or 291. With a directional pattern of 120° horizontal by 20° vertical, it provides focused vertical dispersion, making it suitable for applications requiring controlled sound projection over distance.
Specifications
| Model Rating Type | Manta ray Rehhorn |
| Directional property | 120° x 20° |
| Crossover frequency | 500Hz |
| Applicable throat | No throat required |
| Accessories | Horn Mounting Bracket (Sold Separately) |
| Compatible Driver | 288, 290, 291 |
| Power level for Driver 288 | 109dB/W/m 121dB/15W/m |
| Power level for Driver 290 | 107dB/W/m 127dB/100W/m |
| Power level for Driver 291 | 108dB/W/m 124dB/40W/m |
| External Dimensions (without Screwdriver) | Width 560 x Height 283 x Depth 330 mm |
| Weight | 3.6kg |
Design
The MRII5124 is constructed from fiber reinforced plastic (FRP), making it both lightweight and durable. Its horn design enables directional control across a frequency band from 500 Hz to 16 kHz, enhancing clarity and projection in professional audio setups.
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