Stellar S300

Technical Specification

Unit Weight

  • 13 lbs [5.9 kg]

Unit Dimensions

  • 17” x 3” x 12” Chassis only. 13" deep including connectors.

Shipping Weight

  • 16.5 lbs [7.5 kg]

Shipping Dimensions

  • 22”x 8” x 17”

Color Options

  • Black
  • Silver

Mains Power Inputs

  • IEC C14

Accessories Included

  • UK (BS 1363) (230V version)

Audio Inputs

  • RCA (Unbalanced)
  • XLR (Balanced)

Speaker Outputs

  • Copper base nickel plated binding posts (2 pair per channel)


  • DC Trigger Input
  • 3.5mm 5-15VDC


  • 3 years parts and labor



  • 30.5dB +/-0.5dB

Sensitivity for rated output power

  • 1.01V


  • 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

Overview & Features

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
  • Efficient operation with very little heat
  • Dual, solid copper, plated, output binding posts
  • 13 pounds
  • Input 12 volt trigger

PS Audio Stellar S300

Power Amplifier

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