The RA180 is a state-of-the-art integrated amplifier using the latest innovative technologies. Power damping and dead times were reduced to 1/10 or less. Linearity was dramatically improved to create a near-perfect sound that transcends the boundaries between digital and analog. Enjoy the pure sound of nature provided by the RA180. New Concept Class AD AmplifierThe amplifier has developed from Class A to AB to Class d. Class AB was developed to improve the high hear generation and low efficiency of A. Class D has higher efficiency and higher output than AB, and also significantly improved S/N and THD characteristics compared to A and AB. However, the sound quality has been evaluated as inferior to A/AB due to the limitations of the digital circuit.The GaN class AD amplifier developed by HiFi ROSE has dramatically improved the problems of the existing Class D by applying innovative new materials. Class AD AmplifierClass D amplifiers have a topology that theoretically provides a perfect linear output at 0% distortion and 100% power efficiency. In order to achiece this, the switching action requires high speed and accuracy. However, previous products were weak compated to Class A/AB in the linearity aspect due to the limitations of silicon FET, which had couldn't produce a smooth and natural sound. In the RA180, a new material, GaN FET, was used instead of Silicon FET to solve this problem. The dead time was dramatically improved to 1/10 or less, 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. FEATURES Class AD Amplifier with next generation GaN FET Multi Output Component Designed to play up to the Super Twitter Realm Balanced Power Supply PHONO Amplifier with Variable EQ TECHNICAL SPECS Amplifer Output 4Ω: 200W x 4ch 8Ω: 200W x 4ch BTL Mode On: 400W x 2ch Input Sensitivity Balance Input: 2,000mV Unbalance (line 1,2,3) Input: 1,000mV Phono (MM/MC) Input: 5mV/0.5mV Impedance Input Balance Input: 44kΩ Unbalance (Line 1,2,3): 47kΩ Phono (MM/MC) Input: 47kΩ Bandwidth Speaker Output: 10Hz ~ 100kHz H/F Speaker Output: 10Hz ~ 100kHz Frequency Respond Speaker Output: 10Hz ~ 100kHz H/F Speaker Output: 10Hz ~ 100kHz THD Measure Balance & Unbalance (Line 1,2,3) Input: 0.006% (50W) Damping Factor Speaker & F/H Speaker Output: >150 Signal to Noise Ration Measure(S/N) Balanced, Unbalances / Phono MM: 108dB / 106dB / 79dB(MM) Impedance Output Speaker Output: 53mΩ Subsonic Filter with On/Off Switch -3db: 50Hz Tone Control with On/Off Switch Bass(100Hz) / Treble(10kHz): ±15dB Size: 430 X 350 X 110mm (Including feet: 430 X 391 X 130mm) Weight: 37lbs Power Power: SMPS 800W Voltage: AC100-240V, 50/60Hz