PS Audio Stellar S300 Stereo Power Amplifier


PS AudioStellar Series

The S300 combines the slam, linearity, and toe-tapping pacing of a Class D output stage with the warmth, grace, and rich inner detail of Stellar’s Class A Analog Cell.


SKU: stellar s300 Categories: ,


The problems faced when crafting a new power amplifier are many—delivering sufficient power, control, frequency extension, and dynamics while maintaining a perfectly layered soundstage under the most complex musical passages.

All amplifiers sound different. What determines sound quality are the components and topologies of the amp’s input voltage stage and output current stage. Each section should complement the other. Between them, the amp develops its sound.

Stellar’s design imperatives—affordable pricing, and uncompromised sonics—were major challenges solved by the invention of a unique new circuit christened the Analog Cell.

Stellar engineer Darren Myers had planned from the outset to take advantage of Class D’s high current, low distortion, ruler flat linearity for the output stage—knowing full well it is the input stage that determines sonic character. This critical interface between preamplifier and power amplifier is where Stellar’s magic would be unveiled; where Myers could lavish upon the music the sweet, tube-like quality of Class A biased MOSFETs. His challenge was to synergistically marry both input and output topologies, for which he invented Stellar’s Analog Cell.

The Analog Cell is the heart of the S300’s musicality, where richly overlayed layers of music’s inner details are preserved even in the most complex orchestral crescendos. The Analog Cell is a proprietary, fully differential, zero feedback, discrete, Class A MOSFET circuit, hand-tuned to capture the smallest micro dynamics without sacrificing the loudest macro dynamics music has to offer.


        • Stereo power amplifier
        • Dual mono, each with their own power supply
        • Zero-loss Analog Cell input stage
        • Powerful MOSFET output stage
        • RCA Single ended input
        • XLR “true” balanced input
        • 140 watts per channel 8Ω
        • 300 watts per channel 4Ω
        • 2Ω stable
        • Less than 0.1% thd 20Hz to 20kHz at rated power
        • Damping factor greater than 550 for excellent loudspeaker control
        • Front panel standby button
        • Effieicient operation with very little heat
        • Dual, solid copper, plated, output binding posts
        • 27 pounds
        • Input 12 volt trigger

      Unit Weight: 6 kg
      Unit Dimensions (W x H x D mm):432 x 80 x 310. 331mm deep including connectors.
      Shipping Weight: 7.5 kg
      Shipping Dimensions (W x H x D mm): 560 x 210 x 432
      Color Options: Black
      Voltage Options Factory set only: Japan 100V
      North America 120V
      Europe/Asia/Australia/New Zealand 230V
      Mains Power Inputs: IEC C14

      Audio Inputs
      RCA: (Unbalanced)
      XLR: (Balanced)
      Speaker Outputs S300: Copper base nickel plated binding posts (2 pair per channel)
      Other: DC Trigger Input: 3.5mm 5-15VDC
      Warranty: 3 years parts and labor

      Gain: 30.5dB +/-0.5dB
      Sensitivity for rated output power: 1.01V
      Noise: 1kHz@300 Watts <-100dB
      Input impedance: Unbalanced: 50KΩ
      Balanced: 100KΩ
      Output Impedance: 50Hz, 2.8VRMS <0.007Ω Damping factor: 50Hz. 2.8VRMS 8Ω >1100
      4Ω >550
      Frequency Response: @2.8VRMS
      10Hz – 20KHz +/- 0.5dB
      10Hz – 50KHz +0.1/-3.0dB

      1KHz, 1W/4Ω: <0.02%
      10-20KHz, 1W/4Ω: <0.02%
      10-50KHz, 1W/4Ω: < 0.05% (90kHz BW)
      1KHz, 37.5W/4Ω: < 0.01%

    • Output Power
      Both channels driven 120vac mains, 1kHz, 1% THD
      8Ω 140W minimum
      4Ω 300W minimum
      2Ω Stable for musical transients

Additional information


Black, Silver


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