HiFiROSE RS451 Network Streamer at Vinyl Sound Toronto Canada

The RS451 is a master fidelity network streamer from HiFi ROSE (Seoul, South Korea), available at Vinyl Sound in Toronto, Canada. Inheriting the high-performance architecture of the flagship RS151, the RS451 integrates dual ESS SABRE ES9027PRO DAC chips with dedicated independent circuits for pre-out and headphone output, the proprietary ROSE DPC (Digital Processing Core) module with Femto clock for minimum jitter, and the ROSE NRA (Noise Reduction Analog) filter for flat, roll-off-free frequency response. Housed in a slim, desktop-optimized aluminium enclosure with an 8.8-inch Full HD touchscreen and three front-panel headphone outputs, the RS451 delivers reference-class HiFi ROSE performance in a form factor engineered for the modern listening space.

ROSE DPC Module and Femto Clock: Flagship-Level Jitter Reduction in a Compact Form

The RS451 inherits the ROSE DPC (Digital Processing Core) module directly from the flagship RS151, making it one of the very few desktop-format network streamers to deploy Femto clock technology in its signal chain. The DPC module precisely synchronizes all incoming digital audio signals to the Femto clock reference and converts them to I2S format before delivery to the DAC stage. Every processing block within the module is designed to maintain maximum signal accuracy, and the circuit responsible for the user interface and GUI is completely isolated from the digital audio signal path. This physical separation ensures that the touchscreen, operating system, and network activity generate zero interference in the audio circuit — a discipline carried over directly from the RS151 and almost never found in a streamer of the RS451's physical size.

Dual ES9027PRO DAC Design: Independent Circuits for Pre-Out and Headphone Output

The RS451 uses two separate ESS SABRE ES9027PRO DAC chips, one dedicated exclusively to the pre-out section and one dedicated exclusively to the headphone output. This is not a shared or switched configuration — each DAC chip operates within its own precision circuit, optimized for its specific output stage and load requirements. The pre-out DAC is designed with precision circuitry for seamless integration into high-end audio systems via balanced XLR or unbalanced RCA outputs. The headphone DAC is paired with four high-performance amplifiers to achieve precise impedance matching, low noise, and the current delivery needed to drive demanding headphone loads across a wide impedance range. Three front-panel headphone outputs are provided: a 4.4 mm balanced pentaconn connector, a 6.35 mm single-ended jack, and a full-size XLR balanced output, covering every major headphone termination standard without the need for adapters.

ROSE NRA Filter and the Visible Audio Philosophy

Following the DAC stage, the RS451's analog outputs pass through the proprietary ROSE NRA (Noise Reduction Analog) filter. This circuit eliminates residual noise and maintains a flat frequency response across the entire audible range including extremely low frequencies, where conventional analog output filters typically introduce roll-off. The NRA filter ensures that the full information content of high-resolution sources is reproduced faithfully at both the pre-out and headphone output stages without frequency-dependent coloration. The 8.8-inch IPS LCD touchscreen with 1920 x 480 resolution reflects HiFi ROSE's Visible Audio design philosophy — the idea that the interface through which a listener navigates and controls their music should be as carefully considered as the audio circuits themselves. The display delivers vivid album art presentation, wide-angle visibility, and intuitive capacitive touch operation across the complete ROSE Connect ecosystem.

Key Features

• Dual ESS SABRE ES9027PRO DAC Chips: Two independent DAC chips with fully separate circuits — one dedicated to the pre-out section for system integration, and one dedicated to the headphone output stage with four high-performance amplifiers for precise impedance matching and powerful drive capability.
• ROSE DPC Module with Femto Clock: Flagship-inherited Digital Processing Core synchronizes all digital signals to a Femto clock reference and aligns them as I2S before DAC conversion, with complete GUI circuit isolation from the audio signal path.
• ROSE NRA Analog Filter: Proprietary Noise Reduction Analog filter maintains flat frequency response to the lowest audible frequencies without roll-off, faithfully reproducing the full content of high-resolution audio sources at both output stages.
• Three Front-Panel Headphone Outputs: 4.4 mm balanced pentaconn, 6.35 mm single-ended, and full-size XLR balanced outputs, covering all major headphone termination standards from a single front panel without adapters.
• Balanced XLR and Unbalanced RCA Pre-Outputs: Both output types available simultaneously for flexible integration with integrated amplifiers, preamplifiers, and powered monitor speakers.
• 8.8-Inch Full HD IPS Touchscreen: 1920 x 480 resolution capacitive LCD with wide viewing angle and vivid color, reflecting HiFi ROSE's Visible Audio philosophy for an immersive and intuitive user experience.
• HDMI eARC Input: Accepts uncompressed audio from televisions and AV processors via HDMI eARC for whole-system audio integration in living room setups.
• Comprehensive Digital Input Suite: Optical, coaxial, HDMI eARC, and USB 2.0 Type-B digital inputs alongside one unbalanced analog line input.
• Full Digital Output Suite: Optical, coaxial, USB 3.0 Type-A, and HDMI 2.0 digital outputs for connection to outboard DACs or recording interfaces.
• HDMI 2.0 Video Output: 4K UHD at 60 Hz for high-resolution media display and video playback.
• Desktop-Optimized Form Factor: Slim 3.62-inch height chassis designed for desktops, bookshelves, and living room audio racks without compromising connectivity or performance.
• Signature ROSE Aluminium Enclosure: Constructed from aluminium with rust-proof steel and ABS elements, available in Black or Silver, with a top-engraved ROSE emblem as a visual focal point.
• ROSE Connect App Control: Full remote control via the ROSE Connect app for iOS and Android for system-wide management and playback.

Technical Specifications

Connections at a Glance

• Headphone Out: 4.4mm Balanced x1, 6.35mm Single-Ended x1, XLR Balanced x1 (all front panel)
• Analog Out: Balanced XLR x1, Unbalanced RCA x1
• Analog In: Unbalanced Line In x1
• Digital In: Optical x1, Coaxial x1, HDMI eARC x1, USB 2.0 Type-B x1
• Digital Out: Optical x1, Coaxial x1, USB 3.0 Type-A x1, HDMI 2.0 x1
• Video Out: HDMI 2.0 (4K UHD / 60Hz)
• Network: Wi-Fi and Ethernet

Frequently Asked Questions

What is the HiFiROSE RS451?

The HiFiROSE RS451 is a master fidelity network streamer from HiFi ROSE of Seoul, South Korea, featuring dual ESS SABRE ES9027PRO DAC chips with independent circuits for pre-out and headphone output, the ROSE DPC module with Femto clock for jitter minimization, three front-panel headphone outputs including 4.4 mm balanced and XLR, and an 8.8-inch Full HD IPS touchscreen. It is available in Canada through authorized dealers including Vinyl Sound in Toronto.

How does the HiFiROSE RS451 compare to the Astell and Kern AK Stream and Cocktail Audio X45PRO?

The RS451 occupies a distinct position among desktop network streamers. The Astell and Kern AK Stream is a compact streamer transport without onboard DAC or headphone output, requiring an external DAC for analog output. The Cocktail Audio X45PRO includes a built-in DAC and headphone output but uses a single shared DAC circuit for all outputs and does not deploy a dedicated jitter-reduction module equivalent to the ROSE DPC. The RS451 differentiates itself with dual independent ES9027PRO DAC chips — one per output stage — a Femto clock DPC module inherited from the flagship RS151, three discrete headphone outputs covering balanced and single-ended standards, and the ROSE NRA analog filter for flat full-range frequency response, all within a desktop form factor.

What is the ROSE DPC module and why is it significant in the RS451?

The ROSE DPC (Digital Processing Core) module is a proprietary HiFi ROSE circuit that synchronizes all incoming digital audio signals to a Femto clock reference before converting them to I2S for the DAC stage. Its significance in the RS451 is that it brings Femto clock jitter reduction — a technology normally found only in flagship-class components — into a slim desktop streamer. The DPC module also physically isolates the GUI and touchscreen circuits from the audio path, ensuring the operating system and display activity generate no interference in the signal chain. This level of circuit discipline is exceptional in a product of the RS451's size and form factor.

Can the HiFiROSE RS451 drive demanding headphones directly?

Yes, the RS451's dedicated headphone DAC is paired with four high-performance amplifier circuits designed for precise impedance matching across a wide range of headphone loads. Three output connectors are provided on the front panel: a 4.4 mm balanced pentaconn for balanced headphones, a 6.35 mm single-ended jack for standard headphones, and a full-size XLR balanced output for headphones terminated with XLR connectors. The dedicated headphone DAC and amplifier stage operate completely independently from the pre-out circuit, meaning headphone listeners receive a signal path optimized specifically for their listening mode.

Does the HiFiROSE RS451 work as a DAC for an external digital source?

Yes, the RS451 accepts external digital sources via its optical, coaxial, HDMI eARC, and USB 2.0 Type-B inputs. This allows it to function as a DAC and headphone amplifier for sources such as computers, televisions via eARC, CD transports, and other digital devices, in addition to its primary role as a network streamer. The HDMI eARC input is particularly useful for routing television audio through the RS451's high-quality DAC stage and headphone outputs.

Where can I buy the HiFiROSE RS451 in Toronto or Canada?

The HiFiROSE RS451 is available at Vinyl Sound, an authorized HiFi ROSE dealer in Toronto, Canada. Vinyl Sound carries the full HiFi ROSE lineup and provides expert advice on system matching, in-store demonstrations, and authorized Canadian warranty support for all HiFi ROSE products.

What amplifiers or speakers pair well with the HiFiROSE RS451?

The RS451's balanced XLR and unbalanced RCA pre-outputs connect directly to any integrated amplifier or preamplifier with compatible inputs. For a complete HiFi ROSE system, the RS451 pairs naturally with the HiFiROSE RA280 integrated amplifier via its balanced XLR input, both of which are available at Vinyl Sound in Toronto. The RS451 is also well suited to powered monitor speakers with balanced inputs for a compact, high-performance desktop audio system, given its slim 3.62-inch chassis height and desktop-optimized proportions.