HiFi Rose RS250 audio & video streaming D/A preamplifier Specifications

Sidebar 1: Specifications

Description: Roon Ready music streamer/digital processor, with ES9038Q2M DAC, dual-core Cortex-A72 processor up to 1.8GHz, and quad-core Cortex-A53 up to 1.4GHz, running Android 7.1 and compatible with Airplay, DLNA, Roon, Spotify Connect, Tidal, Qobuz, Bugs, Internet Radio, RoseTube (YouTube), and RosePodcast. Display: 8.8" TFT LCD & capacitive touchscreen (MIPI-DSI). Digital audio inputs: one each coaxial S/ PDIF, TosLink S/PDIF, USB, Ethernet network port; USB ports. Analog inputs: 1 pair single-ended on RCA jacks. Digital audio outputs: USB, S/PDIF coaxial, S/PDIF optical. Analog outputs: 1 pair single-ended on RCA jacks, 3.5mm headphone jack. Video output: HDMI 2.0 × 1 (up to 3840 × 2160/60Hz). File system: NTFS/exFAT/FAT32. Network protocol: SMBv1, SMBv2/FTP/ WebDav. Storage interface: USB3.0 ×2, SATA ×1. Audio file formats supported: MQA, WAV, FLAC, AIFF, WMA, MP3, OGG, APE, DFF, DSF, AAC, CDA, AMR, EC3, E-EC3, MID, MPL, MP2, MPC, MPGA, M4A, ALAC. PCM sample rates supported: 8kHz–768kHz (8/16/24/32 bits per sample). Native DSD rates supported: DSD64 (2.8MHz), DSD128 (5.6MHz), DSD256 (11.2MHz), DSD512 (22.4MHz). Analog frequency response: 20Hz– 20kHz, ±0.5dB. Maximum analog output level: 2.3V RMS. Analog output impedance: 100 ohms. Headphone output: 1V RMS into 32 ohms (2V RMS maximum into 300 ohms). THD: 0.0002% (1kHz at 2.3V RMS). THD+N: 0.0003% (1kHz at 2.3V RMS). IMD: 102dB (SMPTE 4:1, 60Hz:7kHz). S/N ratio: 126dB max (CCITT filter); >133dB, 20Hz–20kHz. Optional accessory: internal SSD for music data storage, CD drive. Supplied accessory: Bluetooth remote control. Can also be controlled with RoseConnect Premium app for iOS and Android devices.
Dimensions: 11" (278mm) W×3"(76mm)H×7.95" (202mm) D. Weight: 7lb (3.2kg).
Finish: Anodized aluminum with black side and rear panels.
Serial number of unit reviewed: ESL 106AB000084, bottom panel; 0B4450, system info display. System info: v3.8. Audio firmware: XMOS 3115. "Made in Korea."
Price: $2495. Approximate number of dealers: 50. Warranty: 1 year from date of purchase.
Manufacturer: Citech Co., Ltd. 11F, 932 Yangjae-daero, Songpa-gu, Seoul, South Korea. Tel: 82-1899-6042. Web: hifirose.com. US distributor: MoFi Distribution, 1811 W. Bryn Mawr Ave. Chicago, IL 60660. Tel: (312) 841-4087. Web: mofidistribution.com.

COMPANY INFO
Citech Co., Ltd.
US distributor: MoFi Distribution
1811 W. Bryn Mawr Ave.
Chicago, IL 60660
(312) 841-4087
ARTICLE CONTENTS

COMMENTS
Axiom05's picture

Well, the jitter spectrum of the QB-9 Twenty looks good at least. I really should get my QB-9 DSD upgraded.

CG's picture

Good catch!

That's probably the review of the QB-9 Twenty in its entirety. After all, the Twenty is an upgrade to a no longer manufactured product.

And, yeah, you should get the upgrade. At the risk of sounding like a shill for Ayre, the upgrade is really worth the asking price, and probably a lot more. (Which I paid in full - if I'm a shill, I'm also a very bad negotiator.)

Axiom05's picture

I just upgraded the USB board in my QX-5 Twenty and WOW, I was not expecting this kind of improvement. Definitely a worthwhile upgrade. I guess we're both shills for Ayre. :-)

CG's picture

I can see why.

Compare Figure 16 to the comparable plot in the Stereophile review for the original QX-5 Twenty.

Of course, many, many people will tell you that this sort of thing is inaudible and that you are crazy. But, crazy people can be happy, too.

CG's picture

Somewhat OT:

This seems as good a place to ask this as any.

This particular digital solution seems to perform not quite as well as some other products with regard to jitter sidebands. Is this audible? By how much? Why?

Now... Head to the bottom of this very web page and click on the button that says "hi-finews". That'll take you to a website for the magazine of the same name.

Look at a turntable review. Any turntable review.

In the Lab Report, there is a plot of what is labeled Wow and flutter. This is a spectral display of a single tone from a vinyl disc played back through the turntable under review.

Isn't that pretty much the same concept as the jitter test, at least with regard to the central tone of the J-test at 11 KHz?

So, how is one to interpret all of this? One is obviously far different than the other.

It's not obvious from either plot and associated labelling what the measurement parameters are for the spectrum analyzer. The resolution bandwidth, the video filtering, the averaging type and number of samples, the detector type, and so on are not shown for either. (To be fair, this might be explained in an article somewhere that I failed to find - my bad.) Variations there would explain a lot. But, maybe there's much more to it.

I find this all confusing. Perhaps I am the only one who does, though.

Perhaps I am overthinking all of this, too. Wouldn't be the first time.

Archimago's picture

I don't think there's much confusion here. Jitter was never all that audible as an issue. No need for audiophiles to fear this "boogeyman" in general. I posted a demo for folks to listen to years ago - just Google "Archimago Jitter Demo".

Yeah, the J-Test for a device like this is not good for modern 2021 digital especially for the 24-bit ethernet input. I still don't think it's audible in real music anyways, it's more of a reflection of the engineering that the time-domain wasn't better despite the claims of using femtoclock parts and the ESS ES9038Q2M DAC chip!

No surprise as well that turntables are comparatively inaccurate vs. digital (Google "Archimago vinyl LP fidelity" for a discussion). It's very obvious if one listens to a pure tone like 3150Hz as per HiFi News. Time-domain is poor with LP playback not just because of turntable rpm variations but also the imperfections of the vinyl itself. Again, with music we don't notice these issues as much.

BluesDog's picture

Nice article. Thanks for testing storage drives (i.e. usb thumb drive, portable HDD, etc) on this device Some of us have amassed significant size CD quality or better on storage drives. From the late 90’s and before streaming had the quality we see tday. Streaming Qobuz and Tidal are impressive but some of us aren’t quite ready to pay for yet another streaming subscription. Articles like yours (and the use of Roon) help prepare us for if that plunge ever comes.

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