HiFi Rose RA180 Integrated Amplifier

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- Mark Sparrow, Forbes

 RA180 At A Glance

• Advanced Class D amplifier design with 800W output.
• Gallium Nitride FETs for perfect linear output.
• Four amplifier modules to support Bridge Tied Loads or bi-amping.
• Frequency range up to 100kHz.
• Separate outputs for two sets of stereo speakers.
• Built-in moving magnet and moving coil phono stage.
• Phono stage with adjustable EQ.
• Active crossover to support Super Tweeter frequencies.
• Tonally flat output design.
• Bass and treble tone controls.
• Bypass Power Amp mode.
• High-efficiency power supply with Silicon Carbide FET.
• Dimmable VU meters.

Product Description

Combining aesthetics from the past with technology engineered for the future, HiFi Rose RA180 is a new type of integrated amplifier that will transform your listening experience. With its illuminated meters, sleek silver chassis, and gleaming sliders and switches, its aesthetics are simultaneously retro and futuristic. The RA180 is engineered for an extremely wide frequency response (even beyond that of human hearing), to enable your system to deliver a stunningly immersive soundstage.

F4 Mono Amplifiers - Multi Output Configuration using Modules

Each channel of the RA180 amplifier is equipped with an AMP module specialized for stable bass and balance and a module specialized for soft treble and super tweeter area, with two modules. Each AMP module supports 200W (8 Ohms) and can output up to 400W per channel, for a total output of 800 watts. There are two independent modules that divide the high and low frequencies respectively, so that the speaker and, when connected, Bi-Amping has a driving force which is increased without being affected by the back electromotive force. RA180 also features BTL Mode which combines the output of two independent modules to produce a thicker and more balanced sound.

Phono Ready

The RA180 has built-in moving-magnet (MM) and moving-coil (MC) phono stages, with switch selection. It has adjustable EQ, with EQ values corresponding to curves from various record-manufacturers, using parts with a 0.1% tolerance.

Gan FET Technology

As longtime audiophiles know, amplifier design has evolved, from Class A to Class A/B to Class D. Engineers developed Class A/B to improve the high heat generation and low efficiency of Class A. Class D has higher efficiency and higher output than Class A/B, and it significantly improved the signal-to-noise ratio and THD (total harmonic distortion) characteristics, as compared to Class A and Class A/B. However, many found the sound quality to be inferior to A and A/B due to the limitations of the digital circuit. The Gallium Nitride (GaN) Advanced Class D amplifier developed by HiFi Rose has dramatically improved issues related to existing Class D technology; this was achieved by applying innovative new materials. Class D amplifiers have a topology that theoretically provides a perfect linear output at 0% distortion and 100% power efficiency. In order to achieve this, the switching action requires high speed and accuracy. However, previous products were weak compared to Class A and A/B in the linearity aspect, due to the limitations of Silicon FET, which couldn't produce ultra-smooth and natural sound. In the RA180, HiFi Rose has used a new material, GaN FET (instead of Silicon FET), to solve this problem. The dead time was dramatically improved, and a nearly perfect linear output was realized with a switching speed close to zero. This linearity goes beyond the Class D limits and produces a smooth and natural sound— like an analog amplifier.

Treble Design that Reproduced even the Super Tweeter Area

The human hearing range is known to have an upper limit of 15 - 20KHz. So why would it be necessary to build an amp with a higher range? Using modern research and experience it's now perhaps a good time to question this belief. Temporary high treble can extend well beyond 20KHz. For example, the trumpet has a frequency response that expands up to 100KHz. RA180 has an output range of 20Hz - 50Khz, 100Khz@-3dB, 200KHz @-6dB. The frequency response range is designed to be wide so that high-resolution sound sources are not filtered. This ability might be beyond human audible range, but at a wide frequency it faithfully plays the area. The depth and width of the sound and the realism will contribute to the expression.

Balanced Power Supply

The power supply that has been exclusively developed for the RA180 applies fourth-generation Silicon Carbide (SiC) FET technology to provide high output with less heat. In addition, by using a self-developed PFC (power factor circuit), it is designed to not be affected by sudden load fluctuations. The power supply device was developed to support a powerful damping factor, and the high output of 1,000 watts is designed to produce deep bass and accurate treble tones.

Specifications:

Design Size: 16.9" W x 13.7" D x 4.3" H
Weight: 36.8 lbs
Finish: High Purity Aluminium
Inputs & Outputs
Audio input: Balanced XLR Line Input x1, Unbalanced RCA Line Input x 3, MM/MC (switchable) Phono Input x 1, COAX x 1, USB Audio In x1
Audio output: Subwoofer Out x 1
Power
Amplifier Output: 4 Ohms 200W x 4ch (800W)
Amplifier Output: 8 Ohms 200W x 4ch (880W)
Amplifier Output: BTL Mode On 400W x 2ch (400W)
Input Sensitivity: Balanced Input 2000mV
Input Sensitivity: Unbalanced (Line 1, 2, 3) Input 1000mV
Input Sensitivity: Phono (MC/MM) Input 5mV / 0.5mV
Impedance Input: Balanced Input 44k Ohms
Impedance Input: Unbalanced (Line 1, 2, 3) Input 47k Ohms
Impedance Input: Phono (MM/MC) Input 47k Ohms
Bandwidth (0dBr +- 3dB / 8 Ohm): Speaker Output 10Hz - 90kHz
Bandwidth (0dBr +- 3dB / 8 Ohm): H/F Speaker Output 10Hz - 90kHz
Frequency Response (1W, 0 +- 1dB / 8 Ohm): Speaker Output 10Hz - 90kHz
Frequency Response (1W, 0 +- 1dB / 8 Ohm): H/F Speaker Output 10Hz - 90kHz
THD Measure: Balanced and Unbalanced (Line 1, 2, 3) Input 0.005% (50W)
Damping Factor: Speaker and H/F Speaker Output >150
Signal to Noise Ratio (S/N): BTL / Balanced, Unbalanced / Phono MM, MC 107dB / 105dB / 80dB (MM), 60dB (MC)
Impedance Output: Speaker Output 53m Ohm
Subsonic Filter with On/Off Switch: -3dB 50Hz
Tone Control with On/Off Switch: Bass (100Hz) / Treble (10kHz) +- 15dB
X-Over with On/Off Switch: HPF (-3dB) 600Hz - 6kHz
Phono Turnover Flat
Phono Turnover 300Hz (+7.7dB @100Hz)
Phono Turnover 400Hz (+11.7dB @100Hz)
Phono Turnover 500Hz (+13dB @ 100Hz)
Phono Turnover 700Hz (+14.5db @ 100hz)
Phono Roll-Off Flat
Phono Roll-Off 1.6kHz (-16dB @ 10kHz)
Phono Roll-Off 2.1kHz (-13.7dB @ 10kHz)
Phono Roll-Off 3.18kHz (-11dB @ 10kHz
Phono Roll-Off 3.4kHz (-8dB @ 10kHz)
Phono Roll-Off 6.36kHz (-5dB @ 10kHz)
Power: Power SMPS (800W)
Power: Voltage AC100-230v, 50 / 60Hz
Audio In / Out on Rear: Trigger Trigger Voltage Can be turned On: 3.3v - 12v
Remote Control: IR Input 38kHz Infrared Ray (Within 10m of operating distance)

Manual: