Headphone gain selection – Oppo HA-1 User Manual
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Mute All (default) – Both the Headphone Jack and Pre-amplifier Output are muted when the MUTE button
is pressed. This condition is indicated by a Mute icon on the Front Panel Display. Mute is cancelled if the
MUTE button is pressed again, or if the Volume Knob is turned.
Mute Pre Out – Only the Pre-amplifier Output is muted when the MUTE button is pressed. This is indicated
by the word “MUTE” displayed next to the volume level on the Front Panel Display. Mute is cancelled if the
MUTE button is pressed again. Adjusting the Volume Knob does not cancel mute so that headphone
volume can still be adjusted while the Pre-amplifier Output is muted. Please note that when mute is
cancelled, the Pre-amplifier Output level is determined by the current Volume Knob position. Use caution if
you listen to the headphones and speakers at significantly different volume levels.
Remote:
Headphone Gain Selection
For optimal sound quality, you can select the Headphone Gain setting between High and Normal in order to properly
match the sensitivity and impedance of the headphones in use. The following selections are available:
High (default) – The headphone amplification circuit of the HA-1 applies the high gain level, which is about
18dB higher than Normal. This setting is recommended for headphones with low sensitivity or high
impedance.
Normal – The headphone amplification circuit of the HA-1 applies the normal gain level. This setting is
recommended for headphones with high sensitivity or low impedance.
The rule of thumb for selecting the proper gain level is to find a comfortable listening volume that utilizes the upper
range of the Volume Knob. It is generally better to have the Volume Knob set to a high volume level when using the
Normal gain setting rather than having the Volume Knob set to a low volume level when using the High gain setting.
Note:
In order to prevent a sudden loud sound from damaging your headphones and hearing, please turn down the
volume before changing the Headphone Gain setting.