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Pioneer Spec-4 Stereo Power Amplifier w/ Extra FaceplateVery good condition; minor ding on the top and corner (pics 6, 7). Please see all pictures, and message us with any questions. Serial no. XE3600434MTESTED ; WORKINGThe previous owner kept did not provide any service history, but this amp works perfect. The aftermarket black faceplate looks great, and the original silver faceplate is also included. The OG plate has some bends, dings on the corner as shown. No smoke/ odors. Very clean inside as shown. The blue lights look great, but please note these were hard to photo and the brightness level is more appropriate in person. Power output: 150 watts per channel into 8Ω (stereo) ; Frequency response: 5Hz to 100kHzTotal harmonic distortion: 0.01% ; Speaker load impedance: 4Ω to 16ΩDimensions: 18.9 x 7.4 x 17.5” ; Weight: 54 lbsComes with an extra faceplate installed, along with original dented faceplate. In the Milwaukee Area? Stop in our shop to inspect/demoSee our feedback and thank you for considering. All the gear we sell is packaged with great care for safe arrival in the condition advertised and backed up by our 14 day full refund policy in the event you are not happy for any reason.Got your eye on multiple pieces of ours? Send us a message and we’ll do our best to create a custom bundle.Local pickup at our shop in Milwaukee, WIMilwaukee Vintage10220 W. Greenfield AveMilwaukee, WIHours: Tues-Friday: 11-6; Saturday: 11-3; Sunday/Monday: CLOSED
A clean ask at US$1,700 is a little below the US$1,789 median and right at the US$1,700 25th percentile, so this reads as a solid buy rather than a stretch. It is not a screaming bargain, but it is priced on the friendly side of the current used market for a comparable Spec 4 preamp.
The appeal here is straightforward: Pioneer Spec gear has a strong reputation among vintage-hi-fi buyers for authoritative, full-bodied line-level sound and serious build quality, which keeps demand steady. If the unit is complete, cosmetically clean, and functions properly, the upside is owning a desirable late-70s piece at a price that still leaves room for a careful service if needed.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Pioneer traces its roots to 1937 in Tokyo, Japan, when founder Nozomu Matsumoto, inspired by the thrill of imported hi-fi speakers, developed the A-8 dynamic speaker and launched a radio and speaker repair shop. The business formalized as Fukuin Shokai Denki Seisakusho in 1938, evolving into Pioneer Corporation and embodying Matsumoto's philosophy of "Move the Heart and Touch the Soul" through audio innovation.
The brand excels across diverse hi-fi categories, pioneering Japan's first headphones in 1960 with the SE-1 and the world's first component-based stereo system in 1965 via the PSC-5A. Pioneer's portfolio spans amplifiers, speakers, turntables, and DACs, alongside landmark car audio advancements like the 1975 Supertuner-equipped stereo and the 1986 in-car CD player, blending home and automotive excellence.
Today, Pioneer holds a commanding mid-to-high-tier position in the market, revered for reliable, performance-driven gear that balances premium quality with accessibility. Its vintage components attract collectors, while current offerings appeal to discerning buyers seeking robust, innovative sound reproduction without boutique excess.
See all Pioneer listings on RADAR.
