HiFi Rose RA280 Integrated Amplifier

New for 2024 is the HiFi Rose 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 analogue technologies with excellent linearity achieved through strong power damping and short dead time. The HiFi Rose RA280 offers a special listening experience that lets you feel the true essence of music.

In the Hi-Fi audio field, amplifier technology has continued to evolve in the order of Class A, Class A/B, and Class D. Class D amplifiers that utilize the latest technology are outstandingly superior in efficiency compared to Class A or A/B 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 the limitations of digital circuits. To overcome these limitations, HiFi ROSE independently developed Class A/D 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 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 A/B 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 analogue amplifier.

The HiFi Rose 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.

Specifications

Power output: 500W (SMPS) (* Maximum Output : 600W)
THD: 0.007% (@125W) (* 250W × 2ch)
Frequency response: 20Hz ~ 20kHz +0. OdB (* 1W x 2ch. 8Ω Speaker Output ); 10Hz ~ 66kHz +0, -1dB (* 1W × 2ch, 8Ω Speaker Output ); 10Hz ~85kHz +0, -3dB (* 1W × 2ch, 8Ω Speaker Output)
S/N Ratio: 109dB / 109dB / 85dB (* 250W × 2ch)
Input sensitivity: Balance Input 600mV (* 250W × 2ch); Unbalance (Line 1,2,3) Input 600mV (*250W × 2ch); Phono (MM) Input 5mV (* 250W × 2ch)
Input impedance: 47kΩ
Output Impedance: 30mΩ (* 250W × 2ch)
Phono: Turnover 500Hz (+13dB@100Hz) (* RIAA); Roll-off 2.1kHz (-13.7dB@10kHz) (* RIAA)
Input voltage: AC100-230V, 50/60Hz (* Standby Mode Power Consumption < 0.5W)
Enclosure material: Solid Aluminium, Rust-proof Steel
Dimensions (W x D x H): 430 x 355 x 103mm
Weight: 9.5kg