HiFi Rose

HiFi Rose RA280 Integrated Amplifier

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Pickup available at The Barn

Usually ready in 24 hours

Available to demo in store

The RA280 is an integrated amplifier that inherits the innovative technologies used in RA180. Enjoy pure natural sound as close to the original sound as you can get with the RA280: a near-perfect sound that transcends the boundaries between digital and analog 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.



Class AD Amplification

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 utilize 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 analog amplifiers due to the 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 analog 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 perfectly 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, RA280 uses the innovative new material gallium nitride (GaN) to replace the previously used silicon FET (field effect transistor). This dramatically improves dead time to 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 analog amplifier.

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 sound as possible.

Moving Magnet Phono Stage

The RA280's phono amplifier supports moving magnet cartridge input, which can be activated with a simple switch selection. The activated phono amplifier amplifies the very weak audio signals captured by the cartridge with precision and processes them without distortion. Additionally, it utilizes a high-precision correction circuit independently developed by HiFi ROSE to deliver audio signals as close to the original sound 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.

Advanced Power Supply

The RA280 actively utilizes 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 than silicon FET, enabling optimal power supply. Based on innovative design of the materials and structure, the RA280 stably provides high output while minimizing 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.



430(W) X 355(D) X 103(H)





Suit prostel



Amplifier Output

Sub Woofer Output


250W x 2ch (500W)


1Vrms (2.218 dBu)


Balance Input

600mV (* 250W x 2ch)

Input Sensitivity

Unbalance(Line1,2,3) Input

600mV (* 250W x 2ch)

Phono(MM) Input

5mV (* 250W x 2ch)


Balance Input


Input Impedance

Unbalance(Line 1,2,3) Input



Phono(MM) Input


20Hz ~ 20kHz

+0, OdB (* 250W x 2ch,

80 Speaker Output )

10Hz ~ 66kHz

+0, -1dB (* 250W x 2ch,

80 Speaker Output )


10Hz ~ 85kHz

+0, -3dB (* 250W x 2ch,

80 Speaker Output )


20Hz ~ 20kHz

+0, 0dB (* 1W x 2ch,

80 Speaker Output )

Frequency Response

10Hz ~ 66kHz

+0, -1dB (* 1W x 2ch,

80 Speaker Output )

10Hz ~ 85kHz

+0, -3dB (* 1W x 2ch,

80 Speaker Output )

THD (Total Harmonic


Balance &

Unbalance(Line1,2,3) Input

0.007% (@125W)

(* 250W x 2ch)

Damping Factor

Speaker Output

>250 (* 250W x 2ch)

S/N (Signal to Noise Ratio)

Balanced / Unbalanced /


109dB / 109dB / 85dB

(* 250W x 2ch)

Output Impedance

Speaker Output

30ml (* 250W x 2ch)

Tone Control

Bass(100Hz) / Treble(10kHz)


(*1W x 2ch, Speaker Output )



500Hz (+13dB@100Hz)

(* RIAA)


2. 1kHz (-13.7dB@10kHz)



Output Power

500W (SMPS)

(* Maximum Output : 600W)

Input Voltage

AC100-230V, 50/60Hz (* Standby Mode Power

Consumption < 0.5W)

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