HiFiROSE RA180 Reference Integrated Amplifier at Vinyl Sound Toronto Canada

The RA180 is a reference integrated amplifier from HiFi ROSE (Seoul, South Korea), available at Vinyl Sound in Toronto, Canada. Built around a proprietary Class AD GaN FET topology, the RA180 houses four independent mono amplifier modules delivering 200 W per channel (8 ohms) in standard mode and 400 W per channel in BTL mode, with a THD of just 0.005% at 50 W and a signal-to-noise ratio of 107 dB. Combining the linearity of Class A with the efficiency of Class D, the RA180 is engineered for audiophiles who demand both technical precision and analog-like musicality from a single chassis.

Class AD: GaN FET Technology That Redefines Switching Amplification

Class D amplifiers have long promised theoretical perfection, yet silicon FET technology has prevented that promise from being realized in practice. The fundamental problem is dead time: the brief pauses between switching transitions that introduce non-linearity and rob Class D of the smooth, natural character associated with Class A and Class AB designs. HiFi ROSE addresses this directly in the RA180 by replacing silicon FET with Gallium Nitride FET (GaN FET), a next-generation semiconductor material with far superior switching speed and electron mobility. In the RA180, dead time is reduced to 1/10 or less of that found in conventional Class D amplifiers, and switching transitions approach zero. The resulting linearity profile exceeds the practical limits of Class D, producing a sound that is simultaneously smooth and controlled, faithful and dynamic. HiFi ROSE designates this topology Class AD, reflecting its position at the convergence of analog and digital amplifier engineering.

Four Mono Modules: Flexible Output Architecture for Any System

The RA180 is built around four independent mono amplifier modules arranged in two pairs. One pair is optimized for stable mid-bass reproduction and balanced output; the other is voiced specifically for smooth high-frequency and super-tweeter performance. Each module is rated at 200 W into 8 ohms. In standard stereo operation, two modules drive each channel for a combined output of 200 W per side. In bi-amp mode, the mid-bass module and the high-frequency module connect directly to a speaker's separate low and high-frequency terminals, eliminating the interaction caused by counter electromotive force from the woofer and giving each driver its own dedicated amplifier. BTL mode bridges two modules per channel to produce 400 W into 8 ohms for wide, powerful, and richly balanced sound. An active crossover on the high-frequency output, adjustable between 600 Hz and 6 kHz at -3 dB, allows direct integration with ribbon super-tweeters and other extended-range transducers without the need for external crossover hardware.

Extended Frequency Response: Engineered for High-Resolution Sources

The RA180 is specified with a bandwidth of 10 Hz to 90 kHz at +/-3 dB, extending usably to 100 kHz at -3 dB and 200 kHz at -6 dB. While human hearing typically rolls off between 15 kHz and 20 kHz, high-resolution audio formats such as 88.2 kHz and 192 kHz PCM and DSD carry program content well beyond 40 kHz, and acoustic instruments such as trumpets produce harmonic content reaching 100 kHz. HiFi ROSE's position is that faithful amplification of this extended range contributes to a wider and more naturally proportioned soundstage, even when the frequencies themselves are above the threshold of conscious hearing. The RA180's high-frequency output terminals and adjustable active crossover are built with this philosophy in mind, making the amplifier a natural partner for high-resolution digital sources and extended-bandwidth speaker systems.

SiC FET Power Supply with Power Factor Correction

The power supply in the RA180 was developed exclusively for this amplifier. It uses fourth-generation Silicon Carbide FET (SiC FET) technology to deliver high current output with substantially reduced heat generation compared to conventional MOSFET topologies. A self-developed Power Factor Correction (PFC) circuit prevents performance degradation under sudden load changes, which is essential when driving low-impedance or dynamically demanding loudspeakers at full output. The supply is rated at 800 W continuous with a peak capacity of 1,100 W, supports a damping factor in excess of 200, and operates on universal mains voltage from AC 100 V to 230 V at 50 or 60 Hz. FURUTECH pure copper AC terminals at the rear panel preserve signal integrity from the wall socket inward.

Variable EQ Phono Stage for MM and MC Cartridges

The RA180 includes a fully featured phono preamplifier supporting both Moving Magnet and Moving Coil cartridges, selectable via a front-panel switch. Input sensitivity is 5 mV for MM and 0.5 mV for MC, with a signal-to-noise ratio of 80 dB for MM and 60 dB for MC. What separates the RA180's phono stage from nearly every other integrated amplifier implementation is its independently variable EQ. Turnover frequency can be set to Flat, 300 Hz, 400 Hz, 500 Hz, 700 Hz, or RIAA standard. Roll-off frequency offers Flat, 1.6 kHz, 2.1 kHz, 3.18 kHz, 3.4 kHz, 6.36 kHz, or RIAA standard. All EQ components are specified to 0.1% tolerance. This level of adjustability allows the RA180 to accurately reproduce shellac and early vinyl records that were mastered to pre-RIAA equalization curves, a capability rarely found in any integrated amplifier regardless of class.

Key Features

• Class AD GaN FET Amplification: Proprietary topology using Gallium Nitride FET to reduce switching dead time to 1/10 or less of conventional Class D, achieving near-linear output with analog smoothness and high efficiency.
• Four Independent Mono Amplifier Modules: Two mid-bass modules and two high-frequency modules, each rated at 200 W into 8 ohms, configurable for stereo, bi-amp, or BTL operation.
• BTL Mode (400 W Per Channel): Bridges two mono modules per channel for doubled output power into 8 ohms with a full, balanced sonic presentation.
• Active Crossover (600 Hz to 6 kHz): Adjustable high-pass filter on the H/F speaker output enables bi-amping and direct super-tweeter integration without external crossover components.
• Variable Phono EQ with MM/MC Support: Independently adjustable turnover and roll-off settings to accommodate pre-RIAA and RIAA vinyl curves, built with 0.1% tolerance EQ components.
• SiC FET Power Supply with PFC: Fourth-generation Silicon Carbide FET supply rated at 800 W continuous and 1,100 W peak, with Power Factor Correction for stable output under dynamic load conditions.
• Extended Bandwidth to 200 kHz: Frequency response of 10 Hz to 90 kHz at +/-3 dB, extending to 200 kHz at -6 dB to support high-resolution sources and super-tweeter systems.
• Five Source Inputs: Three unbalanced RCA line inputs, one balanced XLR input, and one MM/MC phono input, with motorized volume control operable by remote.
• Pure Direct Mode: Bypasses tone control, balance, and active crossover for a direct signal path and maximum signal purity.
• Subsonic Filter: Switchable -3 dB filter at 50 Hz blocks ultra-low frequency noise from affecting speaker performance.
• Tone Control: Bass (100 Hz) and Treble (10 kHz) controls each adjustable +/-15 dB, with on/off switch to remove them from the signal path entirely.
• Dual Speaker Outputs: Two sets of speaker terminals selectable from the front panel, supporting A/B speaker switching.
• FURUTECH AC Terminals: Pure copper Furutech IEC inlet at the rear panel preserves electrical integrity from the mains input forward.
• High Purity Aluminium Chassis: Rigid enclosure measuring 430 x 350 x 110 mm and weighing 16.7 kg, with a three-level front panel dimmer.
• Trigger and IR Remote: 3.3 V to 12 V trigger input for system integration and 38 kHz infrared remote control with up to 10 m operating distance.

Technical Specifications

Connections at a Glance

• Line Input x3 (RCA unbalanced)
• Balanced Input x1 (XLR)
• Phono Input x1 (MM/MC switchable)
• Speaker Output A and B (two sets, front-panel selectable)
• H/F Speaker Output (high-frequency module output with active crossover)
• Subwoofer Output (RCA, for active subwoofer connection)
• AC Power Input (FURUTECH pure copper IEC terminal)
• Trigger Input (3.3V to 12V for system automation)

Frequently Asked Questions

What is the HiFiROSE RA180?

The HiFiROSE RA180 is a reference integrated amplifier from HiFi ROSE of Seoul, South Korea, rated at 200 W per channel (8 ohms) across four independent mono modules, with a Class AD GaN FET topology, built-in MM/MC phono stage, and BTL capability delivering 400 W per channel. It is available in Canada exclusively through authorized dealers including Vinyl Sound in Toronto.

How does the HiFiROSE RA180 compare to the Hegel H590 and Gryphon Diablo 300?

The RA180 occupies a distinct technical position relative to competitors like the Hegel H590 and Gryphon Diablo 300. Where the Hegel H590 uses a proprietary Class AB topology rated at 301 W per channel and the Gryphon Diablo 300 uses a biased Class A/AB design with 300 W per channel, the RA180 deploys a Class AD GaN FET switching architecture with four independent mono modules and a modular bi-amp output configuration not offered by either competitor. The RA180 also includes a variable EQ phono stage with pre-RIAA curve support, which neither the H590 nor the Diablo 300 provides in the same depth of adjustability.

What is Class AD amplification and how is it different from Class D?

Class AD is HiFi ROSE's proprietary amplifier topology that replaces the silicon FET switching devices used in conventional Class D amplifiers with Gallium Nitride FET (GaN FET). GaN FET switches far faster and more accurately than silicon FET, reducing the dead time between switching transitions to 1/10 or less of what is achievable with silicon. This reduction in dead time is the key to linearity: it allows the RA180 to approach the smooth, natural output characteristic of Class A amplifiers while retaining the high efficiency and output power of Class D.

Can the HiFiROSE RA180 bi-amp speakers directly without an external crossover?

Yes, the RA180 can bi-amp speakers using its four internal mono modules without any external crossover hardware. The amplifier's H/F (high-frequency) speaker output includes a built-in active crossover with an adjustable high-pass filter set anywhere between 600 Hz and 6 kHz at -3 dB. The mid-bass modules drive the low-frequency terminals of the speaker while the high-frequency modules, filtered by the internal crossover, drive the tweeter or super-tweeter terminals. This eliminates counter electromotive force interaction between driver sections and improves overall drive capability.

Is the phono stage in the RA180 suitable for shellac and pre-RIAA records?

Yes, the RA180's phono stage supports multiple turnover and roll-off EQ settings that go beyond the standard RIAA curve. Turnover can be set to Flat, 300 Hz, 400 Hz, 500 Hz, or 700 Hz, and roll-off can be set to Flat, 1.6 kHz, 2.1 kHz, 3.18 kHz, 3.4 kHz, or 6.36 kHz. These settings allow accurate reproduction of shellac records and early vinyl pressed before RIAA standardization in 1954, when different record labels used their own proprietary equalization curves. All EQ components are built to 0.1% tolerance for precise curve accuracy.

Where can I buy the HiFiROSE RA180 in Toronto or Canada?

The HiFiROSE RA180 is available at Vinyl Sound, an authorized HiFi ROSE dealer located in Toronto, Canada. Vinyl Sound carries the full HiFi ROSE lineup and provides in-store demonstrations, expert guidance, and authorized after-sales support for Canadian customers.

What speakers work well with the HiFiROSE RA180?

The RA180's four-module architecture, high damping factor exceeding 150, and output power up to 400 W per channel in BTL mode make it well suited to a wide range of loudspeakers, including large floorstanders, low-sensitivity designs, and multi-way systems with separate high and low-frequency terminals for bi-amping. Its extended frequency response to 200 kHz at -6 dB and dedicated H/F output with active crossover also make it an ideal match for speakers equipped with external super-tweeters such as those from TAOC, Townshend, or Murata.

Does the HiFiROSE RA180 support system automation and external triggering?

Yes, the RA180 includes a trigger input that accepts voltages between 3.3 V and 12 V, allowing it to be switched on and off automatically as part of an integrated home audio system. It also features a 38 kHz infrared remote control receiver with an operating distance of up to 10 metres, and a motorized volume control that can be adjusted from the supplied remote handset.