The power supply inside the RA280 is specifically designed to stay efficient and high speed even under complex loads. HiFi Rose used silicon carbide FETs instead of the standard Silicon FETs in other power supplies. These high-tech devices have high voltage and heat resistance, allowing the power supply to supply maximum power while remaining efficient and cool. This well-designed power supply also applies a 2.5kW power factor correction circuit with a high-capacity condenser to maintain top performance at all loads while keeping stable and reliable.
The RA280 uses a next-gen advanced Class D design developed in-house to take the acoustic performance of traditional Class D amps to a higher level. HiFi Rose calls this tech Class AD. Class D amps are considered much more efficient than traditional Class AB amps, but most have a pretty harsh and edgy sound. HiFi Rose’s Advanced Class AD design resolves these problems with new, innovative materials. The switching output devices are the enemy of sound quality in these high-efficiency designs. Dead time and a slower switching speed can cause noise and distortions to the audio and were responsible for the noise and gritty-sounding nature of early class D designs. Using GaN over traditional silicon transistors allows the switching speed to be much faster, allowing a dead time of 1/10 of silicon transistors. This gives these new class D amplifiers a linear response, allowing them to have a natural, smooth sound quality that aligns more with class A amplifier designs.
Those who wrote off class D designs years ago due to their bright, hard treble, and unforgiving nature must listen to these new Class AD GaN FET designs. Galium Nitride transistors have changed the game regarding the sound quality attainable in class D today.
The class AD GaN FET amplifier section of the RA280 is comprised of two modules that work more like mono-block amplifiers in one chassis. These modules were specifically designed to give the RA280 a pure, analog type of sound more known with pure class-A amplifiers with efficiencies of class D. HiFi Rose applies a two-stage filtering network with -1dB in the frequency band up to 65kHz and -3dB at 85kHz. These two filters reduce carrier noise inherent in class D amplifiers, allowing the RA280 to produce clean and clear audio at all audio bands. Output is 250 watts into 4 or 8 ohms, more than enough power for almost any speaker with headroom to spare.
Overall Recommendation
Regardless of which one you choose, you really cannot go wrong with these high-end DAC/streamers. They share many of the same features and tech with a few key differences as you step up the line.
As the entry-point model in the HiFi Rose line, the RS201E delivers a lot of value with plenty of options to expand it. This is the model to get for anyone wanting a network media player and an integrated two-channel amplifier—all rolled into one easy-to-use component that also looks super cool with an 8.8-inch front panel touch display!
For anyone with a collection of hi-res music & 4K video files stored on an external hard drive or an SD card, this one delivers a very convenient solution to experience it all without breaking the bank. We like that you can pair this one with the HiFi Rose RSA780 CD drive and rip a CD collection right to the unit!
The upper-end models will deliver even better performance for those who care about having the best musical sound quality possible—but as a multimedia all-in-one for rooms where space is limited—HiFi Rose RS201E packs in most of the key features all of the models share with good sound & video and this one offers one the best user interfaces we have ever seen from a DAC/streamer at this price-point.
If you don’t need a streaming DAC with a built-in integrated amplifier, then stepping up to the RS250 will give you a higher-performance DAC for better sound reproduction. The RS250 is a streamer with a preamp built-in and it comes with the same sized 8.8-inch touch capacitive display and form factor as its little brother, but this model steps up the build quality inside and out for a greater emphasis on sound quality. If you are looking for a streaming DAC/preamp that is also a Roon Endpoint, the high-performance ESS Sabre DAC chip inside the RS250 will be a fantastic upgrade for a high-end 2-channel audio system.
The RS150 is the most flexible high-end audio multimedia hub in the lineup of DAC/streamers. The sound it presented satisfied even the hardest to please audiophiles at Audio Advice! While it is so cool that this unit is Roon Ready/Roon endpoint—for the pricepoint—it would have been an even bigger pro if HiFi Rose had tapped into that powerful CPU and made this one into a Roon Core.
It’s not a huge deal—since most Roon users will still use a computer as their core—but it would have really kicked it up a notch if it were made to be a Core. Having said that, as a Roon Endpoint, or a self-contained music server for hi-res audio & 4K video, we strongly recommend the HiFi Rose RS150. If you are in the market for a top-of-the-line streaming DAC with or without preamp capabilities, the HiFi Rose RS150 has one of the best user experiences available, and its sound quality is first-class.
Pairing the RS150 with HiFi Rose’s reference-grade RA180 integrated amp are powerful statement pieces that will let people know how serious you are about sound quality and innovative design. Seeing these two very modern-looking pieces together in a room was a striking match. Everyone who came over was blown away by the side-by-side comparison—especially when we stacked them together! After seeing them and hearing them, it's clear these two statement pieces belong together.
You really cannot go wrong with any of HiFi Rose products as they all have fantastic sound, but we can say, as you move up, you will get even better sound quality. The decision really comes down to the need for amplification, inputs & outputs, and how you plan to integrate a DAC/streamer into your 2-channel setup.
As a tech company made by audiophiles for audiophiles, HiFi Rose products are focused on making premium components with custom build qualities that go well beyond traditional methods. If you have any questions about HiFi Rose and want advice on which one to choose, be sure to give us a call, chat with us on audioadvice.com, or stop into one of our award-winning showrooms. We will be happy to help you out!
If you have any questions, call 888.899.8776, chat with us, or stop by our award-winning showrooms. At Audio Advice, we've been designing and installing high-performance home theaters & smart home systems for our customers in North Carolina and the surrounding areas for decades. In fact, we've delivered more custom theaters than anyone in the Southeast! We are now offering Home Theater Design no matter where you live in the United States! If you are interested in a custom home theater or upgrading your current system, give us a call at 888.899.8776, chat with us, or stop by our award-winning showrooms.