The Auris Phonio Light is a phono 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. In the Phonio Light, we use Sound Plus operational amplifiers connected in an advanced topology that brings precise RIAA equalisation 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). Auris Phonio Light Loading Settings 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 Capacitance 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 Specification MM MC Max input level [at 1kHz] 60mV 4mV/ Low gain Max output 5V 5V Gain 43.2dB Low 58dB, Mid 64dB, High 67dB SNR[un-weighted] >88dB >70.5dB low gain at 1V Bandwidth THD+N 0.0035% at 1V 0.023% at 1V Bandwidth 100Hz – 22kHz (-9dB low gain) THD 0.0003% 0.002% Freq. Response [20Hz-80kHz] ±0.3dB ±0.3dB RIAA accuracy ±0.3dB ±0.3dB Input sensitivity 725mV [5mV input] [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
