By default, the dedicated stereo outputs will output full-range 2.0 audio and downmix all multi-channel content into a 2.0 mix, and bass management only applies to the multi-channel analog outputs, which means that the player's Crossover setting will not impact the dedicated stereo outputs.
In order to utilize the dedicated stereo outputs in a 2.1 configuration with bass management, you will need to change the Stereo Signal setting under the Setup Menu / Audio Processing to Front Left/Right. This will allow the Speaker Configuration section of the Audio Processing menu to apply to the dedicated stereo outputs:
1. Go to the Setup Menu and select Audio Processing.
2. Select Stereo Signal and change it to Front Left/Right.
3. Go to Speaker Configuration.
4. Set the Downmix Mode to Stereo.
5. Set each of the connected speakers to Small and set the subwoofer to On.
6. Exit Speaker Configuration and set the Crossover setting to whatever your preference is.
When the player is configured as detailed above, audio from a source that does not have a dedicated .1 or LFE track will be directed to the subwoofer based on the crossover frequency you select. The Stereo Signal setting applies to both the stereo RCA and balanced XLR outputs.
In some cases, you may want to send a full-range audio signal to your stereo speakers in conjunction with using a subwoofer. This idea is commonly referred to as "double bass". You can accomplish this by configuring the player accordingly:
1. Go to the Setup Menu and select Audio Processing.
2. Select Stereo Signal and change it to Down-mixed Stereo.
3. Go to Speaker Configuration.
4. Set all speakers to Small and set the subwoofer to On.
5. Exit Speaker Configuration and set the Crossover setting to whatever your preference is.
Note: Bass management is not available when using the USB DAC input.
When Stereo Signal is set to Down-mixed Stereo, the settings within Speaker Configuration do not apply to the player's dedicated stereo outputs, which means that setting the speaker sizes to Small in Speaker Configuration will have no impact on the dedicated stereo outputs. However, in order to configure the player to output "double bass", you will still need to set the speaker sizes to Small in Speaker Configuration in order to utilize a subwoofer with content that does not have a dedicated .1 or LFE track. In this case, the Crossover setting is redirecting bass frequencies to the subwoofer that would normally be output from the FL and FR outputs of the multi-channel analog section.
As long as Stereo Signal is set to Down-mixed Stereo, setting the speaker sizes to Small in Speaker Configuration will not engage bass management for the dedicated stereo outputs. Bass management will only be active for the multi-channel analog outputs.