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XDUOO A35 Tube Amplifier
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xDuoo A35 Tube Amplifier Class D Bluetooth 5.1 aptX HD 2x45W 8 Ohms
The xDuoo A35 is a tube amplifier designed to drive passive speakers, it delivers 2x45W of power thanks to a push-pull architecture featuring four EL34 tubes. Its preamp stage uses a 12AX7 tube for voltage amplification and a 12AU7 tube as a driver to ensure a gradual increase in gain while stabilizing the current, thereby maintaining consistent sound reproduction. Operation in ultra-linear mode extends this approach by combining output level and linearity, ensuring a balance between available power and signal integrity.
Designed for integration into a Hi-Fi system, it features an ESS ES9018K2M DAC and connectivity options including Bluetooth 5.1 (SBC, AAC, aptX, aptX HD) and RCA inputs. This versatility allows it to serve as the system’s main component, while the 4Ω and 8Ω speaker outputs make it easy to pair with different models, all while maintaining stable sound reproduction and simple control via remote and front-panel interface.
xDuoo A35: Tube Amplification Architecture
The amplification relies on a fully three-stage tube structure, allowing the signal to increase progressively while preserving its coherence. The 12AX7 tube processes low-level signals at the input, while the 12AU7 tubes stabilize the current before the output stage, preventing variations. This approach extends with four EL34 tubes in push-pull delivering 45W per channel, enabling consistent power delivery to speakers while limiting distortion. Ultra-linear mode operation maintains this balance by combining output level and signal integrity.
xDuoo A35: Playback and Sound Behavior
The extended frequency response of 20Hz to 60kHz allows coverage of the entire audible spectrum without interruption, resulting in stable playback across various types of content. The signal-to-noise ratio of 93dB reduces background noise, improving detail readability at low volume. At the same time, channel separation enhances soundstage structuring, allowing more precise source placement. Controlled distortion finally ensures consistent listening, even as volume increases.
xDuoo A35: Connectivity and Usage
The built-in ESS ES9018K2M DAC converts digital signals from the Bluetooth input while maintaining high playback accuracy. This built-in feature eliminates the need for an external converter.
This approach is further enhanced by a Bluetooth 5.1 receiver compatible with SBC, AAC, aptX, and aptX HD, enabling wireless transmission. The RCA analog inputs allow for the connection of traditional audio sources, while the 4Ω and 8Ω speaker terminals make it easy to pair with various speaker models. The system is controlled via an infrared remote control and a front-panel interface with a volume meter, allowing you to adjust the volume and monitor the device’s operation.
xDuoo A35: Design and Operational Reliability
Point-to-point wiring reduces internal interference, preserving signal quality throughout the amplification chain. This approach is supported by a stabilized power supply using an EI transformer and dedicated filtering components, limiting parasitic noise. Gold-plated connectors ensure reliable contact over time, while the rigid chassis reduces vibrations likely to affect the tubes. Finally, startup delay and protection circuits prevent unwanted noise and secure the system during operation.
Technical specifications
| Specifications | |
|---|---|
| Product type | Headphone amplifier and DAC |
| Tubes | 1x 12AX7 2x 12AU7 4x EL34 |
| Inputs | 3x RCA Bluetooth 5.1 |
| Outputs | Speaker terminals |
| Frequency response | 20Hz-60kHz (+/-1dB) |
| Output power | 45W |
| SNR | ≥ 93dB |
| THD+N | ≤ 1% |
| Input impedance | 100kΩ |
| Output impedance | 4-8Ω |
| Bluetooth codecs | SBC, AAC, aptX, aptX HD |
| General | |
|---|---|
| Power supply | 220-240V / 232 W |
| Dimensions | 380 x 340 x 200mm |
| Weight | 20kg |
| Package contents | 1x xDuoo A35 1x Power cable 1x Remote control |
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