Altec Lansing N501-8A (1970)
A passive 2-way LC crossover network designed for use with Altec 511B horns, released in 1970.
Overview
The Altec Lansing N501-8A is a passive crossover network introduced in 1970 for 2-way speaker systems. It was engineered specifically to work with Altec's 511B compression drivers and was used in speaker configurations such as the A7-500. The unit features a fixed crossover frequency of 500Hz, 12dB/octave attenuation, and includes an adjustable attenuator for high-frequency level control.
Specifications
| Type | LC type for 2-way |
| Allowable input | 100W |
| Input impedance | 8 Ω |
| Attenuator | 1 dB to 10 dB |
| Crossover frequency | 500Hz |
| Attenuation | 12dB/oct |
| External dimensions | Width 122x Height 140x Depth 143 mm |
| Weight | 1.6kg |
| Original price | ¥ 44,100 (1970) |
| Original price | ¥ 39,300 (~1976) |
Design
The N501-8A uses an LC-type circuit for 2-way crossover operation and is specifically designed for use with the 511B horn. The front panel includes an attenuator allowing up to 10 dB of level adjustment.
Context
This crossover network was used in Altec speaker systems such as the A7-500, supporting professional and high-fidelity audio applications during the 1970s.
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