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A$250 is a fair price for a working PS404A, but this listing is for a faulty unit, making it a risky bargain only if you can repair the power supply. The asking price sits between the 25th percentile (A$99) and median (A$168) for used AUD listings, yet the fault pushes it toward the 75th percentile (A$329) in terms of risk-adjusted value, so it’s not a clear deal unless you’re confident in DIY repair.
The PS404A is a respected 4-channel adaptable amp delivering 400W total for fixed installs, flexibly sharing power across 4Ω, 8Ω, 70V, or 100V loads—ideal for commercial audio or multi-zone setups. Its real upside is rarity and versatility: few amps match this adaptability at this power level. If you can fix the power supply (a known but often manageable issue on older Bose pro amps), you unlock a solid, well-regarded unit at a price below median for working equivalents. Only proceed if you have repair skills or a cheap local technician.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Bose Corporation traces its roots to 1964, when MIT professor Amar Gopal Bose founded the company in Natick, Massachusetts, after growing disillusioned with the poor performance of a high-end stereo system he purchased as a graduate student. Driven by a passion for replicating the immersive qualities of live music through rigorous acoustic research, Bose launched the venture with initial contracts for the U.S. military and NASA, emphasizing innovative speaker designs that prioritized indirect, reverberant sound over direct radiation. This American heritage, rooted in psychoacoustics and engineering excellence, has defined the brand's pursuit of "Better Sound Through Research."
Bose excels in consumer and professional audio categories, renowned for its home audio systems, premium speakers like the iconic 901 Series, and pioneering noise-canceling headphones first prototyped in the 1980s for pilots. The lineup extends to vehicle sound systems, portable Bluetooth speakers, and professional installations, but steers clear of niche hi-fi components such as amplifiers, turntables, DACs, or cables, focusing instead on integrated, user-friendly solutions that blend advanced signal processing with spatial audio reproduction.
Positioned as a premium mid-tier powerhouse in the global market, Bose commands widespread appeal among discerning buyers seeking accessible high-performance audio without audiophile esoterica. Its reputation for innovation and reliability has built a loyal following, though purists occasionally critique its measured sound signature, cementing Bose as a dominant force in mainstream hi-fi rather than high-end boutique or vintage realms.
See all Bose listings on RADAR.
