Altec Lansing N500F
A high-power 2-way crossover network with precision attenuation and phase-matched design
Overview
The Altec Lansing N500F is a 2-way crossover network built for large input applications, designed to handle up to 250 watts of power. Made by Altec Lansing, it uses a robust LC circuit with thick windings and a large core volume to maintain signal integrity under high load. Its design focuses on phase matching near the crossover point, helping deliver a smooth frequency response across connected drivers.
Specifications
| Allowable input | 250W |
| Impedance | 16 Ω |
| Crossover frequency | 500Hz |
| Decay rate | 12dB/oct |
| Attenuator | 10-step (0 to -16dB + OFF) in 2 dB steps |
| External dimensions | Width 280 x Height 305 x Depth 137 mm |
| Weight | 8.2kg |
Design
The N500F uses a 2-section LC circuit with low DC resistance, achieved through a winding/core design built for high power handling. The high-frequency attenuator is a tap-type with a 10-step switch, allowing precise level control in 2 dB increments from 0 to -16dB, plus an OFF position. The unit’s case provides internal space to store up to three line-matching transformers, indicating a design focused on integration within professional audio setups.
Market
The Altec Lansing N500F was priced at ¥77,000 around 1970, later revised to ¥99,800, then ¥91,200 by 1976, and reached ¥145,000 by 1982, reflecting its position as a high-end audio component over time.
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