The S300 is an extraordinarily musical power amplifier rated at 140 Watts per channel into 8Ω and 300 Watts per channel into 4Ω. Power enough for even the most demanding speakers. The S300 design marries the best of two worlds: an ultra linear high-current output power stage with a discrete Class A MOSFET based AnalogCell input stage. Between them, the S300 delivers powerful, authoritative control over the loudspeakers, while maintaining a perfectly layered soundstage under the most complex musical passages. Designed by PS Audio engineer Darren Myers, who invested hundreds of hours of tuning, voicing, and perfectionist tweaking, the results are extraordinarily musical. Stellar amplifiers never draw attention to themselves, and are one of our highest value offerings in amplification, a rare quality in amplifiers of any price.
THE ANALOG CELL
The connection between preamplifier and power amplifier is critical, for it is at this junction where most essential musical details are easily lost. Nothing in the design of a power amplifier is more important than its input stage when preserving music’s finest nuances. In the S300, a unique topology, called the Analog Cell, has been employed to preserve the rich details found in music. The Analog Cell is the heart of the S300’s musicality, where rich overlaid 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. The Analog Cell makes all the difference.
The Stellar S300 is a dual mono design. This means that 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, designed in Denmark. Class D output stages provide near-perfect linearity, low distortion, and high efficiency. Because Class D amplifiers require an output filter to remove their switching noise, they do not have frequency extremes into the many hundreds of thousands of Hertz. Depending on their design, modern Class D amplifiers, like the type used in Stellar, extend high frequencies to about 50kHz. Human hearing limitations are 20kHz, though most listeners rarely have hearing exceeding half that. The S300 provides excellent frequency extremes, low distortion, high efficiency, high damping factor, and a powerful output of 300 watts per channel into the most common loudspeaker loads of 4Ω.
Stellar S300 Stereo Amplifier
|Unit Weight||13 lbs [5.9 kg]|
|Unit Dimensions||17”W x 3”H x 12”D (13″D w/connectors)|
|Shipping Weight||16.5 lbs [7.5 kg]|
|Shipping Dimensions||22”W x 8”H x 17”D|
(Factory set only)
North America 120V
Europe/Asia/Australia/New Zealand 230V
|Mains Power Inputs||IEC C14|
|Idle Power Consumption||13W|
|Accessories Included||US (NEMA 5-15P) (all versions)
Schuko (CEE7/7) (230V version)
UK (BS 1363) (230V version)
|Audio Inputs||RCA (Unbalanced)
|Speaker Outputs||Copper base nickel plated binding posts (2 pair per channel)|
|DC Trigger Input||3.5mm 5-15VDC|
|Warranty||3 years parts and labor|
|Sensitivity for rated output power||1.01V|
|Noise||1kHz@300 Watts < -100dB|
|Input impedance||Unbalanced 50KΩ
|Output Impedance||50Hz, 2.8VRMS <0.007Ω|
|Damping factor||50Hz. 2.8VRMS
|Frequency Response||2.8VRMS into 4Ω
10Hz – 20KHz +/- 0.5dB
10Hz – 50KHz +0.1/-3.0dB
|10-50KHz, 1W/4Ω||< 0.05% (90kHz BW)|
|1KHz, 37.5W/4Ω||< 0.01%|
|Both channels driven 120vac mains, 1kHz, 1% THD|
|2Ω||Stable for musical transients|
with the variety of upstream gear we had on hand for testing. It holds its own against
components that exceed its price tag. This PS Audio component deserves a spot on a short
list of bargain amps that perform beyond what one should expect for the money.After a few weeks with the S300 in my reference system, I must admit I am smitten with it.
I applaud PS Audio’s new approach to circuit design bringing together the benefits of both
Class A and Class D technology.