PS Audio Stellar S300 Power Amplifier

Item code: PS Audio Stellar S300

The S300 Amplifier is an affordable stereo power amplifier that brings power, warmth, and clarity to your loudspeakers. Using a Class D output stage combined with a Class A Analog Cell, it delivers deep bass, rich detail, and an expansive soundstage.…
£1,550.00
£1,291.67
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Qty:

SPEAKER CABLES:

A quantity of 2 means you will receive a pair of speaker cables e.g. for your front left and front right speakers. By entering a quantity of 1, you will get a cable for a single speaker e.g. centre speaker and this option also enables you to vary the length (and termination) of your cable for each speaker.

OTHER CABLES:

A quantity of 1 means you will receive a single cable in the case of aerial, satellite, subwoofer, digital coaxial & optical cables and a pair of cables in the case of 2 rca to 2 rca analogue audio cables.

NON-CABLE PRODUCTS:

A quantity of 1 means you will receive 1 of the specified products.

£1,291.67 ex. VAT
Available — built to order, dispatches in 5 - 7 days
Delivery: Royal Mail Tracked 24  ·  DPD Next Day from £8.95  ·  DPD Saturday from £12.95
Order before 4pm (Mon–Fri) for same-day dispatch
Our promise: 60-day returns · Free burn-in · Built in our UK workshop · 3 Years warranty · Expert support on every order

PS Audio Stellar S300 Power Amplifier

 

The S300 Amplifier is a full sized stereo power amplifier designed to unlock the true performance of your loudspeakers while remaining accessible and affordable. As the most attainable stereo power amplifier in the Stellar range, the S300 delivers authority, clarity, and musical realism across every genre. From deep, controlled bass to smooth, natural highs, it brings balance and energy to any hi fi system. At its core, the S300 pairs the speed and efficiency of a Class D output stage with the musical richness of the Stellar Class A Analog Cell.

This advanced hybrid design produces powerful dynamics, excellent linearity, and engaging rhythm while preserving tonal warmth and fine detail. The result is a sound that feels alive, spacious, and emotionally involving. The S300 reveals depth and texture hidden in your music library, allowing you to hear bass extension, layered detail, and a wide soundstage your speakers were always capable of delivering. Whether you are upgrading an existing system or building a new one, the S300 Amplifier offers high performance audio, strong speaker control, and long term listening enjoyment in a reliable stereo power amplifier.

 

Design

The Stellar S300 stereo power amplifier is a dual mono power amplifier capable of effortlessly driving demanding loudspeaker loads to concert levels. It combines the best of two worlds: ultra linear, high-current, Class D technology for the output stage; a discrete, Class A MOSFET based Analog Cell for the all-important input stage. The S300's rich, warm, and engaging sonic character comes from the Analog Cell. It's powerful, authoritative control over the loudspeaker stems from its high current, ultra-low impedance Class D output stage.

 

Application

The perfect choice for just about any loudspeaker, the S300 slips into any system, surprising and delighting even the most discriminating Audiophile. Rated at 140 watts per channel into 8‎Ω and 300 watts per channel into 4‎Ω, the S300 has plenty of horsepower for even the most demanding loudspeakers. Your musical library will open up in ways you might not have thought possible, revealing nuance and detail covered up by traditional amplifiers.

 

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.

 

Output Stage

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.

 

Specifications

  • 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
  • Color Options: Black, Silver
  • Voltage Options (Factory set only): Japan 100V, 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)
  • Audio Inputs: RCA (Unbalanced), XLR (Balanced)
  • 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
  • Gain: 30.5dB +/-0.5dB
  • Sensitivity for rated output power: 1.01V
  • Noise: 1kHz@300 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 into 4Ω,10Hz – 20KHz +/- 0.5dB, 10Hz – 50KHz +0.1/-3.0dB

 

 

About PS Audio

PS Audio is a renowned high-fidelity audio components and equipment provider catering to audiophiles and the sound recording industry. With a rich history dating back to 1973, PS Audio has been at the forefront of audio innovation, delivering exceptional products that elevate the listening experience to new heights. Founded by audio designers Paul McGowan and Stan Warren, PS Audio shipped its first products in 1974. The company's name was derived from the initials of its visionary founders, reflecting their commitment to crafting audio equipment that pushes the boundaries of sonic performance. From the very beginning, PS Audio has been dedicated to delivering uncompromising sound quality and engineering excellence.

PS Audio's product lineup encompasses a wide range of audio components designed to meet the needs of discerning audiophiles. From preamplifiers to mains regenerators, DACs to streamers, PS Audio offers a comprehensive selection of equipment that captures the essence of every musical detail.

PS Audio's unwavering dedication to excellence has earned the company numerous accolades and awards worldwide. From Editors' Choice awards by prestigious publications like Stereophile and The Absolute Sound magazines to consistently earning spots on Stereophile's Recommended Component lists, PS Audio has cemented its reputation as a leader in the audio industry. Experience the power of PS Audio's cutting-edge audio components and elevate your listening experience to new heights. Explore their range of preamplifiers, mains regenerators, DACs, amplifiers, power cables, and power conditioners, and unlock the true potential of your audio system. With PS Audio, immerse yourself in the captivating world of high-fidelity sound reproduction.

 

Specifications

  • 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
  • Color Options: Black, Silver
  • Voltage Options (Factory set only): Japan 100V, 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)
  • Audio Inputs: RCA (Unbalanced), XLR (Balanced)
  • 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
  • Gain: 30.5dB +/-0.5dB
  • Sensitivity for rated output power: 1.01V
  • Noise: 1kHz@300 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 into 4Ω,10Hz – 20KHz +/- 0.5dB, 10Hz – 50KHz +0.1/-3.0dB

We use Royal Mail 1st Class services for our Standard Delivery.

Orders received before 4.30 pm Monday to Friday are usually dispatched the same day by FIRST CLASS post (unless premium postal or timed courier services are selected), subject to stock availability. This does not apply to custom-length cables and speaker cables as these require a longer timescale to terminate. This also excludes all cables selected for the burn-in service. Please note, we do not process orders on national holidays in the UK. Over 98% of our orders are delivered the next working day including Saturdays.

Standard delivery is usually within 2 working days, although 98% of all orders are delivered the next working day including Saturdays. In extreme cases, such as delivery to the Highlands and Islands, this may take 3 days.

All items are fully insured and come with an invoice from Future Shop. We use the Royal Mail for delivery of small packages and DPD Local or DHL for items that weigh over 2KG. Items over 2KG are fully insured and will usually be delivered within 48 hours of placing your order subject to stock availability. For international orders, we use FedEx or DHL services where customers have selected this option.

 

 

Please note, special orders for non-standard cable lengths may be subject to longer deliver time-scales. This may vary from manufacturer to manufacturer.

 

We offer 'Free delivery on orders over £99' subject to the following terms & conditions:

  • Applies only to orders with £99 or more of items (including VAT at the UK rate), at Future Shop
  • Free Delivery on orders over £99 utilises Royal Mail First Class postal service for items weighing under 2KG. For items weighing over 2KG, we use DPD or DHL next working day services which deliver from 9.00am to 6pm within mainland UK (excludes Royal Mail Special Delivery Services and timed next day delivery services by DPD or DHL).
  • Applies only to deliveries to addresses within mainland UK and Northern Ireland addresses. Applies only to orders that are to be delivered to a single Mainland UK delivery address.
  • You will not be eligible for free delivery on your order if any items are cancelled or returned for a refund, bringing the total order amount below £99. Where items are returned, the refund due will be the cost of the item less any postage costs.
  • We reserve the right to change or discontinue 'Free delivery on orders over £99 promotion at any time.
  • FREE DELIVERY FOR ORDERS OVER £99 OFFER DOES NOT APPLY TO TRADE CUSTOMERS.

UK Postal & Delivery Charges - FIRST CLASS

Free UK delivery on all orders over £99*

Weight Price (FIRST CLASS UK POSTAGE)
0000g – 1000g £ 3.95
1000g – 1400g £ 4.95
1400g – 1800g £ 5.95
1800g – 2000g £ 6.95
2000g – 3000g £ 8.95

* Free Delivery on orders over £99 utilises Royal Mail First Class postal service for items weighing under 2KG. For items weighing over 2KG, we use DPD or DHL next working day services which deliver from 9.00am to 6pm within mainland UK.

Free Delivery for orders over £99 excludes Royal Mail Special Delivery Services and timed next day delivery services by DPD or DHL.

 

Special Delivery UK - Guaranteed Next Working Day

We have 99.9% of the UK covered With Royal Mail Next Day Special Delivery. We guarantee delivery to most UK addresses by 1pm the next working day. This includes Northern Ireland, Jersey and Guernsey. Some places take longer to deliver to but we still guarantee delivery within three working days by 5.30 PM.

For the Next Day Special Delivery service, orders must be received by Future Shop by 4.30pm weekdays. Orders after the 4.30pm deadline cannot be guaranteed for same day dispatch.

Please note, Royal Mail Special Delivery for next working day may not be possible where non-standard cable lengths are ordered. If this is the case, the item will be shipped via The Royal Mail Special Delivery service as soon as the cable is custom made.

For orders weighing over 2KG, we reserve the right to ship items using Next Day Pre-Noon Courier Services where Royal Mail Special Delivery option has been selected.

 

Channel Islands & Northern Ireland

We accept orders from all Channel Islands including Alderney, Jersey, Guernsey and Sark. Unless you select a premium service, Items weighing under 2KG are delivered using our standard UK delivery option above. For items weighing over 2KG, a surcharge may be applied for all deliveries to the Channel Islands as well as Northern Ireland.

 

European Countries

Deliveries to EU member states are not subject to 20% VAT after December 31st 2020 and therefore the 20% VAT on items is automatically deducted when you log-in, register or proceed to place an order.

The customer will be liable for the VAT at the local VAT rate, duty on the import and the brokerage service fee if applicable. This may need to be paid in advance to your local Customs & Excise office or the delivery company before your order can be delivered.

We offer the following shipping services:

  • Royal Mail First Class International Airmail Services - Items are usually delivered within 3 to 5 working days.
  • Royal Mail Standard International Mail Services - Items are usually delivered within 7-10 working days.
  • DHL Express International - Items are usually delivered within 24 to 48 hours. DHL orders must be received by 3:30pm for next day service to most destinations in Europe
  • Federal Express International Priority - Items are usually delivered within 24 to 48 hours. FedEx orders must be received by 3.00pm for next day service to most destinations in Europe.
  • Federal Express International Economy - Item are usually delivered within 48 to 72 hours.

We reserve the right to change your shipping method without notification if you select a method that we cannot use for your shipment (for instance, we cannot ship via postal services for items over 2 Kg to International destinations). If we need to change your shipping method, we will choose the least expensive shipping method for your order.

 

Worldwide - Excluding UK & Europe

Deliveries outside of the UK are not subject to 20% VAT and so the 20% tax on items is automatically deducted when you log-in, register or proceed to place an order.

If applicable, the customer will be liable for the taxes at the local tax rate, duty on the import and the brokerage service fee. This may need to be paid in advance to your local Customs & Excise office or the delivery company before your order can be delivered.

We offer the following shipping services:

  • Royal Mail First Class International Airmail Services - Items are usually delivered within 7 to 10 working days.
  • Royal Mail Standard International Mail Services - Items are usually delivered within 15 working days.
  • DHL Express International - Items are usually delivered within 24 to 48 hours. DHL orders must be received by 3:30pm for next day service to most destinations in Europe
  • Federal Express International Priority - Items are usually delivered within 48 hours. FedEx orders must be received by 3.00pm in order to ship items the same day, subject to stock availability.

  • Where the actual weight of the package significantly exceeds the shipping cost charged on orders, we may write to you for an additional shipping charge. For larger orders, items may be shipped in multiple packets at our discretion.

We reserve the right to change your shipping method without notification if you select a method that we cannot use for your shipment (for instance, we cannot ship via postal services for items over 2 Kg to International destinations). If we need to change your shipping method, we will choose the least expensive shipping method for your order.

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PS Audio Stellar S300 Power Amplifier

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Frequently Asked Questions

Start with power (cables & distribution), then upgrade signal cabling, support (Hi-Fi Racks) and isolation accessories. These incremental changes can unlock more from your existing gear. Once you have the basic essentials, then you can look at further upgrades, such as fuses, cartridges, better isolation and more!
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It is usually best to address obvious issues first, such as unstable equipment placement or poor isolation, before adding more specialised accessories. Call (0208 905 1555) or Email (sales@futureshop.co.uk) one of our consultants to identify an ideal upgrade path for your system.
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A high-quality hi-fi system is built around a few core elements working together. At its heart is a source, such as a streamer, turntable, CD player, or digital audio player, which provides the music. This signal is then shaped and boosted by amplification, which may include an integrated amplifier, headphone amplifier, or phono stage depending on the system. The sound is delivered through speakers or headphones, which have a major influence on the overall character of what you hear. Supporting components also play an important role. DACs improve digital playback quality, cartridges and phono stages are vital for vinyl, and hi-fi racks, speaker stands, and isolation products help equipment perform consistently. A balanced system does not rely on one standout component, but on how well everything works together.
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Isolation and support products can make a clearly audible difference, especially in resolving systems. Vibrations from floors, speakers, and even airborne sound can interfere with sensitive components like turntables, DACs, and amplifiers. Proper speaker stands help speakers perform as intended by improving stability, positioning, and bass control. Hi-fi racks and isolation platforms reduce unwanted resonance, helping systems sound cleaner, more focused, and more consistent. While these products may not change the sound as dramatically as speakers or cartridges, they often unlock performance that is already there but being masked by vibration or poor placement.
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That depends on the starting point of the system. If the fundamentals are weak, such as entry-level speakers, poor setup, or missing core components, starting with the basics usually brings the biggest gains. A well-matched foundation allows later upgrades to shine. If the system is already balanced, upgrading individual components can be very effective. Improvements such as a better cartridge, DAC, phono stage, or isolation can refine detail, clarity, and realism. The most rewarding upgrades tend to be those that address the system’s weakest link rather than focusing on one category alone.
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In many systems, the biggest improvement comes from upgrading speakers or headphones, as these shape the sound more than any other component. For vinyl systems, the cartridge and phono stage are often the most influential upgrades. In digital systems, a higher-quality DAC or streamer can significantly improve clarity and timing. Beyond electronics, addressing setup, isolation, and support is often overlooked but highly effective. Improving speaker positioning, adding proper stands, or isolating sensitive equipment can deliver noticeable gains without changing core components. The best first upgrade is usually the one that removes the most obvious limitation in the current system.
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There are lots of components and tweaks that can offer a lift in performance, however, our current favourite is the UK 13A mains fuse from your wall socket to your distribution block or amplifier. This is an often overlooked component in most systems but the improvements far outweigh it's size and cost.
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PS Audio Stellar S300 Power Amplifier

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