The Divaldi AMP-05 is a headphone amplifier that serves as the next iteration following the AMP-01 and AMP-02 models. It boasts a compact, precisely engineered aluminum chassis and utilizes a fully dual-mono design, featuring independent power supplies for each channel. This configuration effectively reduces crosstalk between the left and right channels, enhancing stereo separation and maintaining signal integrity.
At its core, the AMP-05 incorporates a proprietary Class A amplification circuit. Class A amplifiers are recognized for their continuous operation of output transistors, which minimizes crossover distortion and ensures a linear response. This design is typically linked to smooth signal reproduction and reliable performance across various audio frequencies. The manufacturer claims that the output stage of the AMP-05 mirrors the characteristics of tube amplification, emphasizing natural sound reproduction and well-controlled dynamics.
The AMP-05 is equipped with multiple headphone outputs to accommodate different connection standards. These include:
- 6.35 mm TRS (single-ended) – a standard connector for many high-end headphones.
- 4-pin XLR (balanced) – commonly used in professional and high-fidelity applications to provide improved channel separation and lower noise.
- 4.4 mm Pentaconn (balanced) – a newer standard offering balanced audio output in a smaller form factor.
A single headphone output can be utilized at any given moment. Additionally, the rear panel includes a gain adjustment switch, enabling the user to choose between 1 W and 2 W of total output power. This functionality offers versatility for powering both low-impedance and high-impedance headphones, thereby enhancing performance according to the efficiency of the headphones in use.
Power Supply and Circuit Design
The AMP-05 operates with an external 16V AC power supply, which the manufacturer claims is specifically designed to maintain stable operating conditions and reduce fluctuations that may impact sound quality. Furthermore, the amplifier is equipped with a delayed startup feature that prevents immediate audio output to headphones when powered on, thereby safeguarding connected headphones from potential transient noise during the initial power-up phase.
Internally, the amplifier utilizes a mix of THT (Through-Hole Technology) and SMD (Surface-Mount Device) components. The THT components are carefully selected and paired by hand, making them suitable for high-end audio applications where precise electrical characteristics are crucial. This combination of technologies aims to ensure both reliability and consistent performance.
The AMP-05 is housed in a compact aluminum casing, machined from a single block of material, which enhances durability and provides protection against external electromagnetic interference. The SE Gold variant features gold-colored accents along the top and bottom edges, adding a distinctive visual touch.
The amplifier’s design is specifically tailored to promote effective heat dissipation, a crucial aspect for Class A models that produce considerable heat due to their constant power draw. Additionally, the implementation of distinct power supplies for each channel enhances thermal stability and minimizes interference between channels.
The Divaldi AMP-05 advances the features of its predecessors with a revised circuit layout, various output options, and a power adjustment capability to accommodate different headphone types. Its fully discrete Class A architecture and independent dual-mono configuration are intended to deliver exceptional signal integrity, while the use of high-quality components and meticulous manufacturing processes underscores a commitment to precision engineering. The inclusion of an external power supply and a delayed startup feature further improves usability and safeguards connected headphones.
By integrating these technical enhancements and adaptability, the AMP-05 is positioned as a premium headphone amplifier for users in search of a specialized solution for both single-ended and balanced headphone setups.
