Audio Review Blog Logo
Overview
日本語版へ
[New Product] Fundamental Launches New 'ZERO Series' Amplifier Line. First Model is Dual-Chassis Integrated Amplifier 'aina'

[New Product] Fundamental Launches New 'ZERO Series' Amplifier Line. First Model is Dual-Chassis Integrated Amplifier 'aina'

2025/11/21
2 min read
Fundamental
Product Launches
Fundamental Integrated Amplifier High-End Audio New Product

Fundamental Co., Ltd. has announced the launch of its new amplifier series, the “ZERO Series,” with the first model being the dual-chassis integrated amplifier “aina,” available for pre-order from December 1, 2025. Price: ¥5,280,000 (tax included).

The “ZERO Series” was developed with the philosophy of “returning to basics in both structure and electronics.”

Main Features

  • Dual-Chassis Design with Pure Aluminum Machined Chassis: Adopts a dual-chassis configuration with completely separated amplifier and power supply sections. Each chassis is machined from a single ingot of high-conductivity pure aluminum 1070, ensuring thorough non-magnetic properties and vibration control.

  • Non-NFB Voltage Amplification Stage with Discrete Configuration: The voltage amplification stage employs a Non-NFB (Non-Negative Feedback) circuit using ultra-wideband, high S/N discrete high-speed current buffer amplifiers. Achieves extremely low residual noise averaging below 7μV.

  • Powerful Output Stage with Custom Parts: The current amplification stage features a 3-stage Darlington output stage using wideband bipolar transistors, delivering 32W×2 (8Ω) rated output. Utilizes meticulously selected components including a newly developed original protection circuit without protective relays, custom metal film resistors, and custom solder.

  • Made-to-Order with Customization Options: Employs a made-to-order production system where each unit is assembled by a single craftsman. Input terminals (3 systems) can be selected as either XLR or RCA connectors at the time of ordering.

Main Specifications

  • Rated Output: 32W/8Ω, 62W/4Ω, 100W/2Ω
  • Input Terminals: 3 systems (XLR or RCA selectable)
  • Dimensions:
    • Main unit: 320W×116H×293Dmm
    • Power supply: 320W×116H×228Dmm
  • Weight:
    • Main unit: 8.8kg
    • Power supply: 13.2kg

“aina” represents a culmination of Fundamental’s technology and philosophy, pursuing the essence of music reproduction—truly worthy of the ZERO Series name.

Reference Links / Sources