Reference Integrated Amplification Evolved

New Concept Advanced Class D Amplifier

Amplifiers have changed from Class A to AB and Class D. The high heat and low efficiency of Class A required a new design, so Class AB was developed. However, Class D has even higher efficiency and higher output than Class AB.
 
It also has dramatically improved the Signal-to-Noise ratio and Total Harmonic Distortion Characteristics over Class A and AB.
 
However, despite these advantages, due to the limitations of digital circuits, the sound quality has been evaluated as poor compared to A/AB.
 
The GaN (Gallium Nitride) Advanced Class D amplifier developed by HiFi ROSE is an innovative new product. Dramatically improving on the problems of Class D. Harmonized Design by upper-class frame consists of an aluminum body with corner volume knob, power button, and wide view touch screen makes its whole shape exceptional.

Next-gen GaN FET Advanced Class D Amp

Class D amplifiers are theoretically completely linear at 0% distortion and 100% power efficient. It is a topology that provides the output, and to implement it, speed and accuracy must be a prerequisite. However, previous products exhibited non-linearity due to the limitation of the switching element (Silicon FET).
 
It was weak compared to Class A/AB in this area, which produced a soft and natural sound. It was a costly limitation.
 
In the HiFi ROSE RA180, this problem has been solved by new materials. Instead of low-quality Silicon FET chips, the Dead-Time was improved to 10 by applying Gallium Nitride FET chips.
 
This linearity pushes the limit of Class D while being soft and producing a natural sound.
 

Multi-Output Configuration

Each channel of the RA180 amplifier is equipped with an AMP module specialized for stable bass and balance and a module specialized for soft treble and super tweeter area with 2 modules.
 
Each AMP module supports 200W (8 Ohms) and can output up to 400W per channel. There are 2 independent modules that divide the high and low frequencies respectively, so that the speaker and, when connected, Bi-Amping has a driving force that is increased without being affected by the back electromotive force.
 
BTL Mode combines the output of two independent modules to produce a thicker and more balanced sound.
 

Top-end Designed to Sing

The human hearing range is known to have an upper limit of 15 - 20KHz. So why would it be necessary to build an amp with a higher range?

Using modern research and experience it's now perhaps a good time to question this belief. Temporary high treble can extend well beyond 20KHz. For example, the trumpet has a frequency response that expands up to 100KHz.

The ROSE RA180 has an output range of 20Hz - 50Khz, 100Khz@-3dB, 200KHz @-6dB. The frequency response range is designed to be wide so that your high-resolution sources are not filtered out. While this range may in fact be beyond our range of human hearing, RA180 faithfully reproduces the subtle nuances of human voices and other instruments. The depth and width of the RA180's sound and the realism will contribute to the emotional expressions of the artists.

Absolute Pure Sound.

Balanced Power Supply

The power supply circuit was developed exclusively for the RA180. It was designed with 4th generation SiC FET technology to provide high performance and high efficiency compared to typical Si FET.
 
In addition, ROSE has developed a 2.5 KW Power Factor Circuit (PFC) and a large-capacity capacitor. This is designed to allow the unit to be unaffected by sudden load fluctuations. The power unit is developed to support a damping factor of 200 and a total of 1000W of power.
 
As the heart of the amplifier, it is designed to produce powerful bass and soft treble faithfully.
 

Phono Amp with Variable EQ

The Phono amplifier section on the RA180 has the goal of accurately reproducing the intent of the artist.
 
It is designed to support a variety of record players with mid and low-frequency bass turnover and high-frequency roll-off adjustment.
 
Amplification of the very weak audio signal is captured from the cartridge and processed without coloring and faithfully keeping to the original sound.