Description
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).
SPECIFICATIONS
Max input level [at 1kHz]
MM: 60mV
MC: 4mV/ Low gain
Max output
MM: 5V
MC: 5V
Gain
MM: 43.2dB
MC: Low 58dB, Mid 64dB, High 67dB
SNR[un-weighted]
MM: >88dB
MC: >70.5dB low gain at 1V Bandwidth 100Hz – 22kHz
THD+N
MM: 0.0035% at 1V
MC: 0.023% at 1V Bandwidth 100Hz – 22kHz
THD
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
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
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