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 produced in 1946. Manufactured by Altec Lansing, it was designed primarily for public address and background music systems, often deployed in sound columns. It also found use in early high fidelity systems, where its smooth frequency response and low distortion made it a standout performer. Part of the 755 series of full-range drivers, the 755A succeeded an earlier version of the same model and was later succeeded 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 featuring an Alnico V magnet and a field-replaceable voice coil. Its paper cone is straight sided and lightly doped, contributing to its extended frequency response and low distortion. The cast aluminum basket provides structural rigidity, while the 1.75" voice coil allows for controlled cone movement.
Context
Designed for use in sound columns, the 755A was also adopted in early high fidelity systems. It is part of the Altec Lansing 755 series and represents an evolution from an earlier 755A model, with the 755C following as its successor.
Market
The 755A is described as rare and expensive on the used market, with asking prices around $1500 and observed sold prices at $1195. Common issues include brittle doped cloth surrounds and potential loss of magnet strength in the Alnico V magnet over time. It remains highly sought after by collectors and audiophiles.
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