Pioneer S-5000twin (1990)

A tall-boy speaker system from 1990 with a full crystalline diamond diaphragm tweeter and dual 20 cm ALCC cone woofers.

Overview

The Pioneer S-5000twin is a floor-standing speaker system released in 1990. It is a vertical twin design with advanced wavefront control and magnetic shielding. It is a 2-way, 3-speaker bass reflex, and it has a rare all-polycrystalline diamond dome tweeter plus two 20 cm ALCC (alginate composite cone) woofers. Pioneer built it for high linearity and low distortion, with alnico magnets, zinc die-cast frames and a fully isolated internal network. The cabinet is finished in high-quality walnut real wood, with internal vibration control measures.

Specifications

Model Rating Method	2-way, 3-speaker, bass reflex system ・ Tall Boy Type ・ Magnetic Protection Design
Units Used	For low band : 20 cm cone x2, For high band : 3 cm dome type + W. F. director
Impedance	6 Ω
Playback frequency band	28 Hz to 20000 Hz
Output sound pressure level	91dB/W/m
Maximum Input (EIAJ)	180W
Crossover frequency	1800Hz
External dimensions	Width 298x Height 1080x Depth 425 mm
Weight	49.5kg

Design

The S-5000twin uses a vertical twin system with wave surface control technology. Two small-diameter woofers give it voluminous low-frequency reproduction. The 3 cm dome tweeter has a 100% polycrystalline diamond diaphragm and a painted maple laminated W. F. (Wave Front) director for precise wavefront control. The 20 cm woofers use ALCC diaphragms made from pulp, aramid fiber and alginic acid fiber. Their magnetic circuits are high-linearity, with short voice coils and alnico magnets. The units are mounted with a full midship system. The woofers attach to an inner baffle, and the tweeter is fixed from behind through a hair-implanted layer, which reduces baffle vibration. A floating top and shield frame suppress resonance further. The crossover keeps the woofer and tweeter circuits separate, with felt damping under the tweeter section and crimped wiring to reduce signal loss. A radial power supply feeds the network. The enclosure is high-quality walnut real wood plating with internal wool for sound absorption, and a bi-wiring terminal takes separate low and high-frequency signal input.