Originally Posted by
MoKiChU
Hi,
When you plug (unplug then plug if already plugged) the jack 3.5 mm of a headphone, the automatic impedance detection will automatically choose the appropriate level of amplification for you (depending on the impedance of the headphone), but you can force it to Powerful or Extreme manually.
On the other hand, when you use jack 3.5mm to connect audio active/powered equipment (like powered speakers), the automatic impedance detection does not distinguish between passive (like a headphone) and active equipment (like powered speakers) and therefore will wrongly try to detect the impedance audio active/powered equipment, and wrongly adjust the amplification level to Extreme while a audio active/powered equipment should not receive amplified audio stream (to avoid reducing the lifespan of your equipment and not to saturate the sound spectrum).
So, in order to avoid reducing the lifespan of your equipment and not to saturate the sound spectrum, I advise all people who use jack 3.5mm to connect audio active/powered equipment (headsets jack 3.5 mm are not concerned because they are passive/not powered equipment) to set this parameter on Performance, whatever the result of the automatic impedance detection.