HiFi Rose RA280 Integrated Amplifier

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Top-notch Master Integrated Amplifier RA280

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.

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 our design philosophy of externalizing 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 aluminum 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.

Class AD Amplifierwith 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 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.

Balance Control for Bass and Treble

The default output trend of the RA280 is flat and equipped with a tone control function, allowing for 15 dB adjustment of bass (100 Hz) 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

POWER:

• OUTPUT: ( Maximum Power: 500W )
• VOLTAGE: AC100-240V, 50/60Hz (Standby Mode Power Consumption <0.5W)

AMPLIFIER OUTPUT:

• 4 Ω: 250W x 2ch (500W)
• 8 Ω: 250W x 2ch (500W)

INPUT SENSITIVITY:

• BALANCE INPUT: 600mV (250W x 2ch)
• UNBALANCED (Lline 1,2,3) INPUT: 600mV ( 250W x 2ch)
• PHONO (MM/MC) INPUT: 5mV / 0.5mV (250W x 2ch )

IMPEDANCE INPUT:

• BALANCE INPUT: 44kΩ
• UNBALANCE (Line 1,2,3) INPUT: 47kΩ
• PHONO (MM/MC) INPUT:  47kΩ

IMPEDANCE OUTPUT:

• SPEAKER OUTPUT: 53MΩ ( 200W X 4ch )

BANDWIDTH (0dBr+/-3dB/8Ω):

• SPEAKER OUTPUT: 20HZ - 20KHZ ( 250W X 2ch )
• H/F SPEAKER OUTPUT: 10HZ - 66KHZ ( 250W X 2ch )

TOTAL HARMONIC DISTORTION:

• BALANCED & UNBALANCED (Line 1,2,3) INPUT: 0.007%(125W) ( 250W X 2ch)

SIGNAL TO NOISE RATIO:

• BALANCED, UNBALANCED / PHONO MM: 103dB / 109dB / 85dB (MM) ( 250W x 2ch )

DAMPING FACTOR:

• SPEAKER & H/F SPEAKER OUTPUT: >250 ( 250W X 2ch )

TONE CONTROL WITH ON/OFF SWITCH:

• BASS (100Hz) / TREBLE (10KHz):+/-15dB ( 1W x 2ch [Speaker Output] )

AUDIO IN/OUT SETTING:

• TRIGGER: 3.3 V ~12V