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HiFi Rose RA280 - Integrated Amplifier

£2,999.00

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The HiFi Rose RA280 is an integrated amplifier that inherits the innovative technologies used in the RA180.

Enjoy pure natural sound as close to the original as you can get with the RA280: a near-perfect sound that transcends the boundaries between digital and analogue technologies with excellent linearity achieved through strong power damping and short dead time.

The RA280 offers a special listening experience that lets you feel the true essence of music.

Form follows Sound

The design of the RA280 is differentiated by its inner purity. ROSE pursues a pure natural sound that is reflected in all parts based on a design philosophy of externalising the internal parts.

The RA280 provides high quality in terms of overall solid finish and functionality, while at the same time achieving harmony between the interior and exterior through a design that focuses on acoustic aspects. The sturdy aluminium chassis at the top, matte finish, and elaborate arrangement of grooves satisfy both functionality and progressive exterior design.

Additionally, the front buttons and control panel embody vintage elegance and sophistication. The RA280 will make your space even more classy by adding the pure beauty of a perfectly blended interior and exterior design.

RA280 Rear Panel

Class AD Amplifier with Next-Generation GaN FET

In the Hi-Fi audio field, amplifier technology has continued to evolve in the order of Class A, Class AB, and Class D. Class D amplifiers that utilise the latest technology are outstandingly superior in efficiency compared to Class A or AB amplifiers, and have achieved significant improvements in signal-to-noise ratio (S/N) and total harmonic distortion (THD).

However, despite these advantages, evaluation shows a lack of sound quality compared to analogue amplifiers due to limitations of digital circuits. To overcome these limitations, HiFi ROSE independently developed Class AD amplifier technology using GaN (gallium nitride) FETs and applied this technology to the RA280.

It achieved sound quality comparable to analogue while maintaining the efficiency and power amplification of existing Class D amplifiers.

Class D amplifiers are known for their high efficiency, low total harmonic distortion rate, and theoretical topology of perfect linear output. The speed and accuracy of switching operations are essential to achieve perfect Class D design theory.

However, conventional products are lacking in linearity compared to Class A and AB amplifiers due to the limitations of silicon FETs (field effect transistors). It is clear that conventional products had limitations in providing smooth, natural sound quality.

To improve on these problems, the RA280 uses the innovative new material gallium nitride (GaN) to replace the previously used silicon FET. This dramatically improves dead time 1/10 of the previous level and implements linear output with a switching speed close to zero.

This improvement in linearity is the result of pushing the limitations of Class D amplifiers, allowing smooth, natural reproduction of sound quality with the fluidity of an analogue amplifier.

Silicon FET vs GaN FET

Balance Control for Bass and Treble

The default output trend of the RA280 is flat and equipped with a tone control function, allowing for +/- 15dB adjustment of bass (100Hz) and treble (10 kHz). The tone control circuit is equipped with a high-fidelity active EQ (OP-AMP: 12 dB slope) instead of passive (CR), with a gentle 6 dB slope.

Bass / Treble Slope

Two Completely Separated Mono Amplifier Modules.

The RA280 is designed with two separate amplifier modules that operate like a mono amplifier, supporting 250 W (4 Ohm and 8 Ohm) for the left and right amplifiers respectively, outputting 500 W on a stereo channel.

The RA280 applies two-stage analogue filter technology designed by HiFi ROSE to achieve the best sound quality. HiFi ROSE's LC filter provides excellent frequency response by offering -1 dB attenuation in the frequency band up to 65 kHz and -3 dB attenuation in the 85 kHz range.

This technology dramatically reduces carrier noise caused by the inherent switching of Class D amplifiers, providing clearer and cleaner sound quality in all bands. The spatial description and resolution have been greatly improved, creating an evolved sound with an analogue feel.

Separate Amplifier Modules

High-Efficiency Power Supply

The RA280 actively utilises the latest technology via a power supply circuit independently developed by HiFi ROSE. This circuit uses silicon carbide FET instead of silicon FET. Silicon carbide FET is a power semiconductor device with high voltage and high heat resistance. It has higher efficiency and generates less heat that silicon FET, enabling optimal power supply.

Based on innovative design of the materials and structure, the RA280 stably provides high output while minimising heat generation to deliver the best sound quality. In addition, RA280 applies a 2.5 kW power factor correction (PFC) circuit independently designed by HiFi ROSE and introduces a high-capacity condenser to maintain excellent performance even under rapid load situations. This allows for a stronger response in terms of stability and reliability.

Power Supply

Phono Amplifier that Supports Moving Magnet

The RA280 supports moving magnet input with a simple switch selection. The RA280 amplifies the very weak audio signal captured by the cartridge, processes it without distortion, and uses high-precision compensation circuitry developed by HiFi ROSE to deliver sound as close to the original as possible.

In essence, it offers the best sound quality without compromising the fine details of the audio signal and the original impression of the music. The RA280's phono amplifier perfectly provides the essential elements for high-quality music playback, taking the performance of your audio system to the next level and allowing you to enjoy richer, more vivid sound.

Rose RA280 Front Panel

Technical Specifications

Design Size 430 (W) x 355 (D) x 103 (H)
Weight 9.5kg
Body Solid Aluminium, Rust-Proof Steel
Amplifier Output 4 Ohms 250W x 2ch (500W)
8 Ohms 250W x 2ch (500W)
Sub Woofer Output Mono 1Vrms (2.218 dBu)
Input Sensitivity Balanced Input 600mV (* 250W x 2ch)
Unbalanced (Line 1, 2, 3) Input 600mV (* 250W x 2ch)
Phono (MM) Input 5mV (* 250W x 2ch)
Impedance Input Balanced Input 47k Ohms
Unbalanced (Line 1, 2, 3) Input 47k Ohms
Phono (MM) Input 47k Ohms
Bandwidth 20Hz - 20kHz +0, 0dB (250W x 2ch, 8 Ohm Speaker Output)
10Hz - 66kHz +0, -1dB (250W x 2ch, 8 Ohm Speaker Output)
10Hz - 85kHz +0, -3dB (250W x 2ch, 8 Ohm Speaker Output)
Frequency Response 20Hz - 20kHz +0, 0dB (1W x 2ch, 8 Ohm Speaker Output)
10Hz - 66Hz +0, -1dB (1W x 2ch, 8 Ohm Speaker Output)
10Hz - 85Hz +0, -3dB (1W x 2ch, 8 Ohm Speaker Output)
THD (Total Harmonic Distortion) Balanced and Unbalanced (Line 1, 2, 3) Input 0.007% @ 125W (250W x 2ch)
Damping Factor Speaker Output >250 (250W x 2ch)
Signal to Noise Ratio (S/N) Balanced / Unbalanced / Phono MM 109dB / 109dB / 85dB
Output Impedance Speaker Output 30m Ohm (250W x 2ch)
Tone Control Bass (100Hz) / Treble (10kHz) +- 15dB (1W x 2ch Speaker Output)
Phono (MM) Turnover 500Hz (+13dB @100Hz) RIAA
Roll-Off 2.1kHz (-13, 7dB @ 10kHz) RIAA
Power Output Power 500W (SMPS) Maximum Output : 600W
Input Voltage AC100 - 230V, 50/60Hz
Audio In / Out on Rear Trigger In Voltage can be turned on 3.3V ~ 12V
Trigger Out Voltage van be turned on 12V
Remote Control IR Input 38kHz Infrared Ray (Within 10m of Operating Distance)

Further Information

HiFi ROSE RA280 - Owners Manual

FREE DELIVERY

We offer Free Delivery on orders to the UK Mainland over £100.


EXPERT KNOWLEDGE

Our staff are passionate about what they do and can provide advice and assistance on your purchase.

30 DAY RETURNS

You can return any unwanted and unused item within 30 days and get a full refund.


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The products we use and sell are of the highest quality and we trust them wholeheartedly, but every now and again a product has a fault that is covered under the manufacturers warranty.

In the event of such an occurance please contact us via email at info@studioincar.co.uk to proceed with the warranty process.

Below is a list of all the Manufacturers warranty timeframes with any special instructions for extended warranties:

Alpine

  • 1 Year Standard Manufacturers Warranty

Amphion

  • 5 Years standard Manufacturers Warranty

AudioControl

  • 5 Years with Installation by an Authorised Installer (Studio Incar is an Authorised Installer)
  • 1 Year if you are doing your own Installation
  • 2 Years if you register the product with the UK supplier

AudioLab

  • 2 Years standard Manufacturers warranty

    Audison

    • 1 Year standard Manufacturers warranty
    • 2 Years if you register the product with the UK supplier

    Auralic

    • 90 Days Standard Manufacturers Warranty
    • 3 Years Extended Warranty - Product Registration within 30 days of Purchase

    Blackvue

    • 6 Months standard Manufacturers warranty

    Blaupunkt

    • 1 Year standard Manufacturers warranty

    Chord Company

    • Lifetime Warranty

    Dynaudio

    • 2 Years on Car Audio Products - No Extendable Warranty
    • 2 Years standard Warranty on Home Audio Products
    • up to 8 Years Extendable Warranty on Home Audio Products when you register at Dynaudio

    Focal

    • 1 Year Standard Manufacturers Warranty
    • 2 Years Extended Warranty when registered with Focal

    Hegel

    • 2 Years Standard Manufacturers Warranty

    Hertz

    • 1 Year standard Manufacturers warranty
    • 2 Years if you register the product with the UK supplier

    HiFi Rose

    • 2 Years Standard Manufacturers Warranty

    iFi Audio

    • 1 Year Standard Manufacturers Warranty

    JL Audio

    • 1 Year for Speakers and Subwoofers
    • 2 Years for Amplifiers and Processors

    Luxman

    • 3 Years Standard Manufacturers Warranty

    Ortofon

    • 1 Year Standard Manufacturers Warranty

    Peachtree Audio

    • 2 Years Standard Manufacturers Warranty
    • 3 Years Extended Warranty if Registered with Peachtree

    Pro-Ject

    • 2 Years Standard Manufacturers Warranty
    • 3 Years Extended Warranty if Registered with Pro-Ject

    Q-Acoustics

    • 4 Years for Passive Loudspeakers
    • 1 Year for Active Loudspeakers / Subwoofers
    • 5 Years for Passive Loudspeakers if Registers with Q Acoustics
    • 2 Years for Active Loudspeakers / Subwoofers if Registered with Q Acoustics

    SolidSteel

    • 1 Year Standard Manufacturer Warranty

    Sony

    • 1 Year Standard Manufacturer Warranty

    Wharfedale

    • 2 Years Standard Manufacturers Warranty
    • 3 Years Extended Warranty if registered with Wharfedale
    Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday
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