Altec Lansing 620B Custom
A high-efficiency bookshelf speaker system using a modified 38 cm coaxial driver, designed for improved clarity and phase coherence.
Overview
The Altec Lansing 620B Custom is a speaker system developed as a refined version of the established 620B monitor system. Built around a custom 38 cm coaxial driver derived from the 604-8H, it features targeted acoustic modifications to enhance high-frequency clarity and seamless crossover integration. Designed as a 2-way, bass reflex bookshelf system, it delivers high sensitivity and wide frequency response in a substantial enclosure.
Specifications
| System type | 2-Way, 1-Speaker, Bass Reflex System, Bookshelf Type |
| Units used | 38 cm coaxial type (604 to 8 Hcustom) |
| Enclosure | 620 Bcustom |
| Impedance | 8 Ω |
| Playback frequency band | 20 Hz to 20 kHz |
| Output sound pressure level (new JIS) | 101 dB (New JIS) |
| Allowable input (continuous program) | 65W |
| Crossover frequency | 1.5kHz |
| External dimensions | Width 660x Height 1,020x Depth 460 mm |
| Weight | 68.5kg |
Design
The 620B Custom uses a modified 38 cm coaxial driver based on the 604-8H, with the manta ray Lehorn dampened to improve high-frequency clarity. The crossover network incorporates phase-coherent design principles to ensure smooth integration between low and high frequencies. Additional refinements include enclosure improvements and precise tuning of the bass reflex port.
Context
This speaker system represents a significant upgrade over the well-known 620B monitor system, focusing on enhanced sonic accuracy and coherence through targeted driver and enclosure modifications.
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