Hi-Fi Rose RA280 Integrated Amplifier

Description

RA280

The RA280 by HiFi Rose 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

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.

This has achieved sound quality comparable to analog while maintaining the efficiency and power amplification of existing Class D amplifiers, which 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.

Moving Magnet (MM) Phono Stage

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

Advanced Power Supply

RS280 uses a power supply circuit using silicon carbide FET instead of silicon FET. 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.

Features

• Pure natural sound, inheriting the premium essence of RA180 amplifier.
• Solid aluminium chassis with matte finish.
• Vintage elegance plus contemporary sophistication.
• Class AD amplification with Next-Generation GaN FET.
• Bass / Treble tone controls.
• Moving magnet (MM0 phono stage preamplifier included.
• Remote control included.

Specifications

• Dimensions (W x D x H): 430 x 355 x 103 mm
• Weight: 9.5 kg
• Body: Solid aluminium, rust-proof steel.
• Amplifier Output: 4Ω / 8Ω, 250 W x 2ch (500 W)
• Subwoofer Output: Mono, 1 Vrms (2.218 dBu)
• Input Sensitivity
• Balanced Input: 600 mV (* 250W x 2ch)
• Unbalanced Input: 600 mV (* 250W x 2ch)
• Phono (MM) Input: 5 mV (* 250W x 2ch)
• Input Impedance
• Balanced Input: 47 kΩ
• Unbalanced Input: 47 kΩ
• Phono (MM) Input: 47 kΩ
• THD: 0.007 % @ 125 W
• Damping Factor: >250
• SNR: Balanced 109 dB / Unbalanced 109 dB / Phono (MM) 85 dB
• Impedance: Speaker Output 30 mΩ
• Power: 500 W
• Input Voltage: AC 100-230 V, 50/60 Hz
• Remote Control: IR 38 kHz, 10 metres.

Full HiFi Rose Range Available

Unilet Sound & Vision are official retail partners for HiFi Rose, providing sales, advice and assistance on their entire range of high-quality products. Please do get in touch if you would like a demonstration or wish to purchase.

More Information

• RA280, by HiFi Rose
• HiFi Rose RA280 Review, by AV Forums

Additional information

Brand

Hi-Fi Rose

Hi-Fi Rose is a Korean high-resolution lifestyle audio brand which focuses upon the integration of sound with both eyes and ears. Their products feature unique intuitive touchscreen controls, plus a wide range of connections and features.

With a clear focus upon streaming and digital-to-analogue markets, their range is designed to be as much beautiful furniture for your home, as well as high-quality tools for audio reproduction.