Auris Audio Phonio Light Moving Magnet/Moving Coil Phono Amplifier


Auris Audio

Auris Phonio Light is a gramophone preamplifier that has separate MM and MC inputs that are selected using switches on the front of the device, and it has one output – RCA.


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In the Phonio Light, we use Sound Plus operational amplifiers connected in an advanced topology that brings precise RIAA equalization and retention of all good sounds in the audible frequency range, while suppressing hums and bad harmonics that create an unpleasant feeling during listening.

The device comes with a 16V AC adapter that is small enough not to get in the way, and at the same time it can be moved away from the device, which avoids interference and enables the power supply circuit to reduce noise as much as possible.
Inside the device, we have capacitors whose capacitance exceeds 5000uF for better filtration, but that’s not all, because to get an ultra-low sum, we also use an LDO in combination with a BJT to get a power supply topology with a large PSRR (power supply rejection ratio).


Max input level [at 1kHz]
MM: 60mV
MC: 4mV/ Low gain

Max output
MM: 5V
MC: 5V

MM: 43.2dB
MC: Low 58dB, Mid 64dB, High 67dB

MM: >88dB
MC: >70.5dB low gain at 1V Bandwidth 100Hz – 22kHz

MM: 0.0035% at 1V
MC: 0.023% at 1V Bandwidth 100Hz – 22kHz

MM: 0.0003%
MC: 0.002%

Freq. Response [20Hz-80kHz]
MM: ±0.3dB
MC: ±0.3dB

RIAA accuracy
MM: ±0.3dB
MC: ±0.3dB

Input sensitivity
MM: 725mV [5mV input] MC: [0dB High gain]: 0.5mV for 1.15V output

[-3dB Mid gain]: 0.5mV for 0.75V output

[-9dB Low gain]: 0.5mV for 0.4V output


Left/Right MC Loading Resistance
1 and 2 off = 400 Ω
1 only on = 150 Ω
2 only on = 100 Ω
1 & 2 on = 70 Ω

3 and 4 off = 1000 pF
3 only on = 2000 pF
4 only on = 3200 pF
3 & 4 on = 4200 pF

Left/Right MC Gain
2 only on – low gain = 58 dB
1 only on – middle gain = 64 dB
1 & 2 on – high gain = 67 dB

Left/Right MM
Gain = 43.2dB
MM input loading 47kΩ in parallel with 150pF


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