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8
Headphone Output Connection
You can connect your headphones to the OPPO HA-1 using either a standard 6.35 mm connector or a 4-pin XLR
balanced connector. If your headphones terminate with a 3.5 mm connector, you can use the supplied 3.5 mm to 6.35
mm Headphone Adapter to connect the headphones to the HA-1.
For optimal sound quality, you can adjust the Headphone Gain between the Normal and High settings in order to
properly drive headphones that are very sensitive or require additional power. Please refer to the Headphone Gain
Selection section in the Advanced Operations chapter of this manual for details.
Notes:
The 6.35 mm Headphone Jack and Balanced Headphone Jack cannot be used simultaneously. When a 6.35
mm connector is plugged in, the Balanced Headphone Jack is muted.
When plugging and unplugging the 6.35 mm connector, please completely insert or pull out the connector in a
quick motion. Due to the physical shape of the 6.35 mm connector, keeping the connector plugged in half way
causes a short circuit between the left and right output channels, and may trigger the short-circuit protection
feature of the HA-1.
Balanced Headphone Jack Pin-out
The 4-pin XLR socket for the Balanced Headphone Jack uses the following pin-out assignment:
Notes:
Pin 2 (L-) and pin 4 (R-) are individual signal pins and cannot be tied together as the ground pin for a single-ended
headphone. Never use any adapter to connect the Balanced Headphone Jack to a single-ended headphone.
6.35 mm or 4-pin XLR
1: L+
2: L -
3: R+
4: R -
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