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PS Audio Stellar S300 Stereo Amplifier

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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... Read More
Amplifiers -

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.

Available in Black or Silver.

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 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

Specifications:

Unit Weight:  13 lbs [5.9 kg] / Shipping Weight:  16.5 lbs [7.5 kg]
Unit Dimensions:  17” x 3” x 12” Chassis only. 13" deep including connectors.
Voltage Options Factory set only:  Japan 100V,  North America 120V,  Europe/Asia/Australia/New Zealand 230V
Mains Power Inputs:  IEC C14
Accessories Included:

  • US (NEMA 5-15P) (all versions)
  • Schuko (CEE7/7) (230V version)
  • UK (BS 1363) (230V version)
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

Signal:

Gain:  30.5dB +/-0.5dB 
Sensitivity for rated output power:  1.01V
Noise:  1kHz@300 Watts <-100dB
Input impedance S300:  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

THD&IM:

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%

S300 Stereo Amplifier:

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

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