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PS AUDIO - Stellar S300 Stereo Power Amplifier

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Hand-Built, U.S.-Made, Full-Size, 140/300Wpc, Dual-Mono Power Amplifier Drives Most Speakers to Full Potential: Authoritative PS Audio Stellar S300 Preserves Music's Key Details

A hand-built, made-in-the-U.S.A., full-size, under-$1,500, dual-mono power amplifier able to authoritatively drive most loudspeakers to their peak potential all the while sounding natural, musical, and rich? PS Audio's Stellar S300 stereo power amp is all and that and more. Outputting 140Wpc into eight ohms and a whopping 300Wpc into four ohms, Stellar S300 is a new kind of hybrid steeped in traditional and modern technologies. Designed by Darren Myers, it utilizes ultra-linear, high-current Class D operation for the output stage and a discrete, Class A MOSFET-based Analog Cell for the crucial input stage. Stellar S300 delivers sonic results that compete with many components selling for more than three times its price. You'll love the spacious, warm, effortless, dynamic presentation, unearthed nuances, and non-aggressive character. 100% Music Direct Guaranteed.

The secret to Stellar S300's price-to-performance-busting abilities resides with its Analog Cell topology that provides a zero-loss interface between the preamp and DAC. A zero-feedback, balanced, Class A, MOSFET input stage, it closely mirrors the sonic properties of a vacuum tube and conveys music with utmost faithfulness. Carefully voiced by Meyers, Stellar S300 preserves the key details, subtle cues, soundstage dimensions, and instrumental overtones many amplifiers fail to retain. These are the very traits necessary for engaging, emotional connections to your favorite records. Just as important, S300 touts marvelous pacing, glare-free playback, and control over even very complex passages. Let's not forget Stellar S300 is built by hand in Colorado. No cheap Chinese manufacturing or third-party parts here. PS Audio has thrown down the gauntlet with S300 – a component entirely deserving of its Stellar badge.

“Unboxing the sleek Stellars they felt more upmarket than your typical receiver, that's for sure. The Stellars quickly established their superiority in transparency and tonality…”
—Steve Guttenberg, CNET, August 2017

Analog Cell Topology Preserves Details, Nuances, and Richness
The connection between preamplifier and power amplifier is the junction where most essential musical details are easily lost. When it comes to preserving music's finest nuances, nothing in a power amplifier is more important than its input stages. In S300, Analog Cell topology is employed to preserve music's rich details. Long hours of listening and tuning sessions in Music Room One, shared by PS Audio founder Paul McGowan and designer Darren Myers, resulted in a sonic signature that honors the music and never draws attention to itself.

Dual-Mono Design with Separate Independent Power Supplies
Stellar S300 is a dual mono design, meaning each channel has its own, separate power supply. Each of the two channels is a complete and independent power supply and power amplification stage, based on a modern Class D ICE module. Class D output stages' strengths are many: Near-perfect linearity, low distortion, high efficiency. Stellar S300 provides excellent frequency extremes, low distortion, high damping factor, and a powerful output of 300Wpc into the most common loudspeaker loads of four ohms.

Audio Inputs:
   RCA (Unbalanced)
   XLR (Balanced)
Speaker Outputs: Copper base nickel plated binding posts
   DC Trigger Input
   3.5mm 5-15VDC
Output Power (Both channels driven 120vac mains, 1kHz, 1% THD):
   8Ω: 135W minimum
   4Ω: 300W minimum
   2Ω: Stable for musical transients
Gain: 30.5dB +/-0.5dB
Sensitivity for rated output power: 1.01V
Noise: [email protected] 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%
Weight: 13 lbs.
Dimensions: 17" x 3" x 12"
Warranty: 3 years parts and labor

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