Pioneer QX-4000 (1972–1974)
A quadraphonic AM/FM receiver from Pioneer’s early 1970s lineup, designed for four-channel stereo playback.
Overview
The Pioneer QX-4000 is a quadraphonic AM/FM receiver built for four-channel stereo playback, part of the brief but ambitious quadraphonic era of the early 1970s. Manufactured in Japan, it was released between 1972 and 1974 and originally priced at 68,000 Yen in Japan. It features decoding capabilities for SQ and "regular matrix" formats, indicating a focus on compatibility with multiple quadraphonic encoding systems. One owner noted it as the first quad receiver they’d seen in several years, suggesting its rarity today.
Specifications
| Tuning Range | FM, MW |
| Power Output | 10W/ch |
| Music Power (IHF) | 108 watts at 4 Ω; 80 watts at 8 Ω |
| Continuous Power at 4-CH Driven | 10 watts x 4 at 8 Ω |
| Power Bandwidth (IHF) | 15 to 20,000 Hz |
| Dimensions (W x H x D) | 450 x 144 x 350 mm (17-3/4" x 5-11/16" x 13-3/4") |
| Made in | Japan |
| Color | Silver |
Design
The QX-4000 includes switchable decoding for SQ and "regular matrix" quadraphonic formats, reflecting its role as a dedicated four-channel receiver during the height of the quadraphonic experiment.
Market
Listings show current market prices ranging from $180.00 to $475, with the model being monitored for availability on Hifi Shark. Schematics and service data are available online, supporting maintenance and restoration efforts.
eBay Listings
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