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Welcome and overview of the product.
Package contents and initial setup advice.
Voltage requirements and fuse rating information.
How to put the unit into and out of standby.
Instructions for activating the mute function.
Guidance on proper placement for ventilation and heat.
Importance of clear airflow for cooling.
Recommended break-in period for new equipment.
Importance of allowing the unit to warm up before playing.
Information about valve lifespan and replacement.
Details on the function and care of the output transformer.
Welcome and overview of the product.
Package contents and initial setup advice.
Voltage requirements and fuse rating information.
How to put the unit into and out of standby.
Instructions for activating the mute function.
Guidance on proper placement for ventilation and heat.
Importance of clear airflow for cooling.
Recommended break-in period for new equipment.
Importance of allowing the unit to warm up before playing.
Information about valve lifespan and replacement.
Details on the function and care of the output transformer.
The QUAD VA-ONE+ is an integrated amplifier designed for music enthusiasts, aiming to deliver a high-quality audio experience. It is a compact unit with a sleek design, featuring a prominent grille on top, likely for ventilation of its vacuum tubes. The front panel provides intuitive controls for various functions, while the rear panel offers a comprehensive array of input and output connections.
The primary function of the VA-ONE+ is to amplify audio signals from various sources and deliver them to loudspeakers or headphones. As an integrated amplifier, it combines the functions of a preamplifier and a power amplifier in a single chassis, simplifying the audio setup. A key characteristic of the VA-ONE+ is its use of vacuum tubes, which are known for producing a warm, rich, and natural sound signature often preferred by audiophiles. The amplifier is capable of driving a range of loudspeakers and also features a dedicated headphone output for private listening.
Beyond traditional analog amplification, the VA-ONE+ incorporates a versatile Digital-to-Analogue Converter (DAC). This allows the amplifier to process digital audio signals from modern sources such as computers, streaming devices, and digital media players. The DAC supports a wide range of sampling frequencies, including high-resolution audio formats, making the VA-ONE+ suitable for enjoying contemporary digital music collections. The inclusion of Bluetooth connectivity further enhances its versatility, enabling wireless streaming from compatible devices like smartphones and tablets.
The VA-ONE+ offers a user-friendly interface for seamless operation. The front panel includes a large rotary volume control, allowing for precise adjustment of the audio output level. Input selection is managed through dedicated buttons for AUX, Digital In, and Bluetooth, each with corresponding LED indicators to show the active source. A headphone jack is conveniently located on the front panel, and plugging in headphones automatically mutes the speaker outputs, ensuring a smooth transition between listening modes.
The amplifier comes with a remote handset that provides full control over essential functions from a distance. This includes power on/off (standby mode), volume adjustment, muting, and input source selection. The remote's mute function is indicated by a flashing source indicator on the front panel, providing clear visual feedback.
When first powered on, the VA-ONE+ enters a standby mode, indicated by a dimly lit Bluetooth LED. It can be brought out of standby by pressing any front panel button or the standby button on the remote. For first-time activation, the amplifier defaults to the Bluetooth input, and subsequently remembers the last used input source.
Connecting audio sources is straightforward. For analog sources, RCA inputs are provided. For digital sources, the VA-ONE+ offers USB, coaxial, and optical inputs, catering to a variety of digital audio devices. The USB input is particularly notable for its high-resolution audio support, making it ideal for computer-based audio playback. Speaker connections are made via robust terminals on the rear panel, designed to accommodate standard speaker cables.
Proper maintenance is crucial for ensuring the longevity and optimal performance of the VA-ONE+. The manual emphasizes several key aspects:
The VA-ONE+ is designed as a Class II, double-insulated electrical appliance, meaning it does not require a safety connection to electrical earth. However, users are reminded to adhere to all safety warnings and instructions provided in the manual, especially regarding electrical shock risks and proper handling of the mains plug and fuse. Servicing should only be performed by qualified personnel.
General| Type | Integrated Amplifier |
|---|---|
| Frequency Response | 10Hz - 30kHz |
| Frequency Response (-0.5dB) | 20Hz - 20kHz |
| Input Sensitivity (RCA) | 300mV |
| Weight | 11.5kg |
| Input Sensitivity (line) | 300mV |
| Frequency Response (±0.5dB) | 20Hz - 20kHz |
| Total Harmonic Distortion | 0.5% |
| Signal-to-Noise Ratio (A-weighted) | 90dB |
| Total Harmonic Distortion (THD) | 0.5% |
| Input Impedance | 50k Ohms |
| Signal-to-Noise Ratio | 90dB |
| Output Impedance | 6 Ohms |
| DAC | ES9018K2M |
| Digital Inputs | 1 x USB, 1 x Optical, 1 x Coaxial |
| Bluetooth | aptX |
| Headphone Output | Yes |
| Power Output (RMS) | 35W per channel (8 Ohms) |
| Valve complement | 2 x ECC83, 4 x EL84 |
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