Altec Lansing 755A (1946)
An 8" full-range loudspeaker driver from 1946, known for its Alnico V magnet and use in sound columns and early hi-fi systems.
Overview
The Altec Lansing 755A is an 8" full-range loudspeaker driver made in 1946. Altec Lansing built it mainly for public address and background music systems, often in sound columns. It also turned up in early high fidelity systems, where its smooth frequency response and low distortion made it a standout. It belongs to the 755 series of full-range drivers. It replaced an earlier version of the same model and was later replaced by the 755C.
Specifications
| Power Handling | 15 watts |
| Impedance | 8Ω |
| Frequency Response | 40 to 16,000 Hz |
| Sensitivity | 48.5 db (EIA) |
| Diameter (Overall/Basket) | 15.5" |
| Depth | 6.5" |
| Weight | 17 lbs |
| Magnet Weight | 4.5 lbs |
| Voice Coil Diameter | 1.75" |
| Cone Travel | 0.125" |
| Cone Material | Paper |
| Basket Material | Cast aluminum |
Design
The 755A is a full-range, direct radiator driver with an Alnico V magnet and a field-replaceable voice coil. The paper cone is straight sided and lightly doped, which helps its extended frequency response and low distortion. The cast aluminum basket keeps things rigid, and the 1.75" voice coil allows controlled cone movement.
Context
The 755A was designed for sound columns and was also adopted in early high fidelity systems. It is part of the Altec Lansing 755 series and evolved from an earlier 755A model. The 755C followed as its successor.
Market
The 755A is described as rare and expensive on the used market. Asking prices run around $1500, and observed sold prices are at $1195. Common issues are brittle doped cloth surrounds and possible loss of magnet strength in the Alnico V magnet over time. Collectors and audiophiles still seek it out.
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