RS520 is an all-in-one product with built-in network player, DAC, and amplifier.

For DAC and amplifier module, it is equipped with ES9038PRO DAC, the flagship DAC chip of ESS technology and Class AD amplifier module developed by applying new material GaN FET are mounted.

RS520 is an advanced all-in-one network streamer that consolidates the main functions of existing all-in-one streamers into one based on ROSE’s unique design know-how and functions accumulated over many years.
 
Unchangeable Value
The design of the RS520 focused on values that did not change over time.
A refined design that will not change over time and a bold ventilation hole for heat dissipation represent a gentleman with both functionality and enterprising appearance.
 
Integral Aluminium Housing
The housing of RS520, which is made with generous use of high-durability 6000 class aluminum material, is manufactured by an all-in-one process in which four sides are produced as one part.
 
The all-in-one manufacturing process is the most ideal method to fundamentally block vibrations that may occur between separated parts, significantly reducing noise waves that can affect sound quality.
 
12.6 Inch Wide LCD Touchscreen
Visible audio is emphasized using Hi-Fi ROSE’s spacious, wide-viewing-angle multi-touch LCD screen. With a size of 309*82.9 (mm) and a 1920*515 resolution LCD panel, you can enjoy a smooth and clear screen.

ES9038PRO DAC
It is equipped with ES9038PRO, the flagship DAC chip of ESS technology, a world-class DAC manufacturer.

ES9038PRO has extremely low total harmonic distortion plus noise (THD+N) of -122 ㏈, and dynamic range (DNR) of 140 ㏈, making it the industry's best DAC chip. The maximum sampling frequency and bit rate are PCM 768 ㎑, 32 bit, and DSD512 is supported.

ES9038PRO significantly reduces software implementation time compared to previous products to reduce system cost, and minimizes gain error between devices by automatically adjusting gain.

In addition, it is equipped with ESS technology's exclusive jitter canceller to provide exceptional audio clarity.

Seven low-delay filters allow you to play music that meets the needs of a wide range of users.

GaN based Class AD Amplifier
In order to achieve the perfect class-D amplifier design, switching operation speed and accuracy must be ensured. However, due to the limitations of silicon FET, the linearity is weak compared to class-A or class-AB, which limits the ability to produce natural sounds.

The class-AD amplifier mounted on RS520 uses a new material GaN (gallium nitride) FET to dramatically reduce the “dead time” by 1/3 to maximize linearity.
Please enjoy the powerful output of 250 W per channel with Hi-Fi ROSE's class-AD amplifier that maximizes operating speed and accuracy to achieve the perfect class-D amplifier structure.

Discrete OP-AMP
A discrete operational amplifier developed by ROSE is applied to the IV circuit that is essential for the current DAC. Hi-Fi ROSE focused on high open loop gain and aimed to achieve low open loop distortion, low noise, low drift, and low offset. Also, this operational amplifier has a wide bandwidth and power supply range essential for high-quality analog audio amplification, adding a sense of depth to the sound.

So, reproducing the vividness of the deep bass and treble like a live performance, it makes the resonance of the inter-band connection very comfortable.

PFC
The main reason for applying power factor correction (PFC) is efficiency improvement.
   - Active PFC efficiency: 95%
   - Passive PFC efficiency: 68 - 80%
Out of two techniques of Passive and Active PFC, we adopted Active PFC technique.

Advantages of Active PFC Technique
    • The power efficiency is about 95%, so the power saving effect is the highest.
    • It can respond more effectively to a wide range of input power of AC 80 - 265 V.
    • Power quality can be improved by quick response to changes in AC input.
    • It does not produce audible audio hum noise.