Oppo HA-1 - Manual (Page 23)

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It is important to configure an input source in Home Theater Bypass mode only if the connected device has its own
volume control. Do not connect a source device (such as a CD player or DVD player) without volume control to an input
source in Home Theater Bypass mode, since the high output level may cause damage to downstream amplifiers and
speakers.
Although digital input sources can be configured to Home Theater Bypass mode, it is not recommended. This is
because most digital source components do not offer volume control. However, if you intend to use the HA-1 as a pure
DAC device connected to another pre-amplifier with proper volume control, you should configure the digital input
source to Home Theater Bypass mode. This will ensure that the DAC output bypasses the HA-1’s volume control.
Home Theater Bypass mode only affects the Pre-Amplifier Output. The Headphone Jack output volume is still
controlled by the Volume Knob for sources in Home Theater Bypass mode.
The Home Theater Bypass setting applies to the current input source. Unlike the other settings, this setting is per
input, not global. If you need to configure Home Theater Bypass mode for multiple input sources, please select each
input source and then change the setting. The following selections are available:
 Standard (Variable Volume) (default) – The current input source is in standard mode. The Pre-Amplifier
Output level is controlled by the Volume Knob.
 Bypass (Fixed Level) – The current input source is in Home Theater Bypass mode. The Pre-Amplifier
Output level is fixed at the same level as the input signal, and the Volume Knob does not affect the Pre-
Amplifier Output.
When the Bypass (Fixed Level) option is selected, you will be asked to confirm again due to the danger of sending a
high signal level to the Pre-Amplifier Output. Please make your selection and push the Source Selector Knob to
confirm.