The Pioneer SX-950 AM/FM stereo receiver, a standout model from the golden age of audio (1976-78), continues to captivate enthusiasts even today. This receiver wasn’t just about power; it was a harmonious blend of robust performance and sophisticated technology, designed for the discerning listener seeking exceptional sound quality without breaking the bank. The SX-950 delivered on its promise, offering a substantial package of cutting-edge circuitry and ample power under a stylish design.
Front view of the Pioneer SX-950 AM/FM Stereo Receiver, showcasing its classic silver faceplate, controls, and tuning dial.
At its heart, the Pioneer SX-950 boasted a continuous power output of 85 watts per channel RMS into 8 ohms, across the full audio spectrum from 20Hz to 20kHz, with a remarkably low total harmonic distortion of just 0.1%. This power rating ensured it could drive a wide range of speakers with authority, filling rooms with rich, detailed sound. However, the SX-950’s appeal extended beyond mere power. Pioneer engineers prioritized FM performance, equipping it with an advanced front-end to achieve superior stability and sensitivity in radio reception.
The FM section incorporated dual-gate MOS FETs in the RF amplifier and mixer stages. These components are known for their excellent signal handling and low noise characteristics, contributing to the receiver’s ability to pull in weak FM signals clearly. Furthermore, the FM IF section utilized three 2-element ceramic filters alongside a large-scale integrated circuit (IC). This sophisticated design enhanced selectivity and reduced interference, ensuring clean and clear FM broadcasts. For stereo FM, the SX-950 employed a phase-locked loop (PLL) IC in its multiplex section. This innovative approach resulted in exceptional stereo separation, creating a wide and immersive soundstage for FM stereo listening.
The result of these engineering efforts was a sonic performance that set the Pioneer SX-950 apart from its contemporaries in the same price range. Its tonal quality was praised for its accuracy and musicality, making it a favorite among audiophiles who valued both power and finesse. Beyond its technical specifications, the SX-950 also benefited from Pioneer’s renowned design aesthetics and user-centric engineering. Its controls are logically laid out and intuitive to use, making it a pleasure to operate as well as listen to.
Pioneer SX-950 Specifications:
- Tuning Range: FM, MW
- Power Output: 85 watts per channel into 8Ω (stereo)
- Frequency Response: 15Hz to 40kHz
- Total Harmonic Distortion: 0.1%
- Damping Factor: 25
- Input Sensitivity: 6.5mV (mic), 2.5mV (MM), 150mV (DIN), 150mV (line)
- Signal to Noise Ratio: 75dB (MM), 90dB (line)
- Output: 150mV (line), 30mV (DIN), 1V (Pre out)
- Speaker Load Impedance: 4Ω (minimum)
- Semiconductors: 4 x FET, 4 x IC, 55 x transistors, 36 x diodes
- Dimensions: 526.6 x 173 x 411.5mm
- Weight: 19.1kg
A Lasting Legacy:
The Pioneer SX-950 remains a highly sought-after vintage receiver, evidenced by reviews even decades after its production. One user review from 2025 highlights its enduring appeal, with the owner preferring the SX-950 over a later, more powerful model (SX-1080) for both FM radio and CD playback. This speaks volumes about the balanced performance and sonic character of the SX-950. Paired with quality speakers, as mentioned in the review with JBL 4343s, the SX-950 can still deliver an impressive audio experience.
In conclusion, the Pioneer SX-950 stands as a testament to Pioneer’s engineering prowess and design philosophy during the peak of the hi-fi era. It offered a compelling combination of power, advanced FM technology, and sonic excellence, making it a “something extra everywhere” receiver that continues to be appreciated by audio enthusiasts today. For those seeking a vintage stereo receiver with a rich history and exceptional performance, the Pioneer SX-950 is undoubtedly a model worth considering.
