PS Audio Stellar S300 Stereo Power Amplifier



Payment methods: VisaMastercardAmerican Express <span data-zm-widget='inline' data-zm-asset='checkouttitle'> Zip - Own it now, pay later </span>, PayPal, Bank Deposit

SKU: Stellar S300 Category:


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 the 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.

Key Features

  • 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 8-ohm
  • 300 watts per channel 4-ohm
  • 2-ohm 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
  • 27 pounds
  • Input 12 volt trigger


Audio Inputs: RCA (Unbalanced), XLR (Balanced)
Speaker Outputs: Copper base nickel plated binding posts (2 pair per channel)
Other: DC Trigger Input, 3.5mm 5-15VDC

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

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

Output Power
Both channels driven 1kHz, 1% THD
8ohm: 140W minimum
4ohm: 300W minimum
2ohm: Stable for musical transients

Weight: 5.9kg
Dimensions (WxHxD): 432 x 76 x 330mm