Onix A55 MK1
British Onix A55 MK1 stereo integrated amplifier, fitted with a built-in MM phono stage and a black glass fascia, for vinyl enthusiasts seeking a natural sound.
Description
The Onix A55 MK1 is a stereo integrated amplifier designed in the United Kingdom. It combines in a single chassis the preamplification and power amplification needed to drive a pair of speakers, with the added benefit of a built-in phono stage allowing a turntable to be connected directly without a separate preamplifier.
Its stated power output is 2 × 55 W into 8 ohms, rising to 2 × 100 W into 4 ohms. This increase in power as the speaker impedance drops indicates a power supply capable of delivering current, a useful point for driving more demanding or less sensitive speakers. The built-in phono stage is Moving Magnet (MM) type, the most common standard for cartridges fitted to the majority of mainstream turntables.
In terms of looks, the unit stands out with a black glass fascia paired with an aluminium knob, for a sober, well-finished appearance that sets it apart from the more common brushed aluminium or plastic finishes.
This amplifier is aimed at listeners who value natural sound reproduction, particularly those who already own a turntable fitted with an MM cartridge and wish to avoid adding an external phono preamplifier. Its power output suits it to a typical living-room setup, with standard-sensitivity speakers.
Technical specifications
| Power | 2 × 55 W (8 Ω) / 2 × 100 W (4 Ω) |
| Phono | Moving Magnet (MM) stage |
| Fascia | Black glass |
What to check before buying used
When buying this type of amplifier used, several points deserve attention. The volume potentiometer, often the first part to wear, can produce crackling or channel imbalance when turned. The power supply capacitors, sensitive to ageing, affect power handling and sound quality over time. The MM phono stage should also be tested with a known cartridge, as its components can drift over the years. Finally, the black glass fascia, more fragile than a conventional metal fascia, should be checked for any cracks or chips.
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