PS AUDIO STELLAR S300

Ex-demo unit from distributor. Supplied with original packaging and manual.

The Stellar S300 is a surprisingly musical and affordable stereo power amplifier, capable of making any loudspeaker sing and bringing new life to every track in your music collection. What sets it apart is its ability to combine two seemingly opposing worlds: the authority and precision of Class D amplification with the warmth and naturalness of Class A, thanks to its input stage known as the Analog Cell—a fully discrete, zero-feedback, Class A MOSFET circuit designed to capture even the subtlest musical nuances without compromising the energy and dynamics of full orchestral passages. It is this synergy that gives the S300 its rich, warm, and engaging sonic character, delivering a deep, wide, and precisely layered soundstage, even in the most complex musical moments.

Each channel of the S300 is designed as an independent unit in a dual mono configuration, featuring separate power supplies for each side, and utilizing a state-of-the-art ICE Class D output module developed in Denmark. This technology ensures near-perfect linearity, extremely low distortion, high efficiency, and a frequency response that extends up to around 50 kHz—far beyond the limits of human hearing. These features allow the amplifier to control even the most demanding loudspeakers with absolute precision, while remaining silent and cool during operation.

With a rated output of 140 watts per channel into 8 ohms and 300 watts per channel into 4 ohms, the S300 delivers more than enough power to drive challenging loads, maintaining impressive dynamic response and tight control across the audio spectrum. Its high damping factor, exceeding 550, further enhances bass definition and responsiveness, while revealing musical detail that traditional amplifiers often fail to convey.

Every aspect of its design is aimed at achieving maximum sonic transparency—from the input interface, available in both balanced XLR and unbalanced RCA formats, to the copper-plated binding posts engineered for solid, lossless speaker connections. Low power consumption and minimal heat generation make the Stellar S300 ideal for more compact listening spaces, while the 12V trigger input and front panel standby button add convenience and seamless integration to any system.

Carefully designed by engineer Darren Myers, the S300 represents one of the finest expressions of PS Audio’s philosophy: delivering high-level musical performance at a reasonable price, without compromise in build or sound quality. In every listening session, it manages to surprise even the most discerning audiophiles, offering a sound that is fluid, powerful, and emotionally rich—always true to the essence of music.

Technical Specifications:

• Audio inputs: RCA (unbalanced); XLR (balanced)
• Speaker outputs: copper base nickel-plated binding posts (2 pairs per channel)
• DC trigger input: 3.5 mm jack; 5–15 VDC
• Gain: 30.5 dB ± 0.5 dB
• Input sensitivity for rated output: 1.01 V
• Noise: 1 kHz @ 300 Watts < -100 dB
• Input impedance: unbalanced 50 kΩ; balanced 100 kΩ
• Output impedance: 50 Hz, 2.8 VRMS < 0.007 Ω
• Damping factor (50 Hz, 2.8 VRMS): >1100 at 8Ω; >550 at 4Ω
• Frequency response (2.8 VRMS into 4Ω): 10 Hz – 20 kHz ± 0.5 dB; 10 Hz – 50 kHz +0.1/-3.0 dB
• Output power (both channels driven, 120 VAC, 1 kHz, 1% THD): 140 W minimum into 8Ω; 300 W minimum into 4Ω; 2Ω stable for musical transients
• Unit weight: 5.9 kg
• Unit dimensions: 43.2 cm (W) x 7.6 cm (H) x 30.5 cm (D); 33 cm with connectors