Description
Description of the Topping LA90 Amplifier
The Topping LA90 is a compact, high-performance stereo power amplifier that has garnered significant attention in the audiophile community for its exceptional measured performance and innovative design.
Here are its key characteristics:
1. Exceptional Audio Fidelity:
The LA90 is renowned for its state-of-the-art performance. It achieves an incredibly low noise floor and distortion level, with a THD+N (Total Harmonic Distortion + Noise) of just 0.00009% (-121dB). This results in an exceptionally clean, transparent, and detailed sound reproduction, allowing listeners to hear deep into the recording with minimal coloration from the amplifier itself.
2. Fully Discrete Dual-Mono Design:
Unlike many integrated amplifiers that use pre-fabricated chip-based amplifier modules (like ICEpower or Hypex), the LA90 utilizes a fully discrete circuitry. This means all its components (transistors, resistors, etc.) are individual and hand-soldered. Furthermore, it employs a true dual-mono design, with two completely separate amplifier channels sharing only the power cord. This design minimizes crosstalk between channels, improving stereo separation and soundstage precision.
3. Infineon MERUS™ Multilevel Amplification Technology:
At its core, the LA90 uses Infineon's MERUS™ multilevel class D amplifier ICs. However, Topping implements them with their own sophisticated, discrete output stage and feedback network. This hybrid approach combines the efficiency of class D with the linearity and control of a discrete design.
4. Flexible Gain Settings:
A unique feature of the LA90 is its selectable gain settings (0dB, 9dB, 18dB). This allows users to perfectly match the amplifier to their source components (like DACs or preamps), ensuring optimal signal-to-noise ratio and preventing issues with input overload or insufficient volume control range.
5. Power Output and Efficiency:
It delivers 90 watts per channel into a 4-ohm load and 45 watts into 8 ohms (under 1% THD). While not designed for driving extremely inefficient or power-hungry speakers, it provides ample power for most bookshelf and many floor-standing speakers in small to medium-sized rooms. Its class D architecture ensures it runs cool and efficiently.
6. Build and Connectivity:
The amplifier features a minimalist and robust aluminum chassis with a sleek, unassuming design. It has balanced (XLR) and unbalanced (RCA) inputs, offering flexibility for connection to various audio sources.
In summary, the Topping LA90 is an engineering-focused amplifier prized for its benchmark-setting measured performance, clean power delivery, and flexible design. It is aimed at discerning listeners and "measurement-first" audiophiles who prioritize accuracy, transparency, and minimal distortion above all else.
