Sonos ZonePlayer 90 Guide D'installation page 29

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A default (typical) line-in level is automatically assigned when you select a source name.
If the volume sounds too low, you can select a higher line level for this device. You may
experience clipping at higher volume levels if you set the level too high.
Line-in encoding settings
When you have line-in music sources attached to a ZonePlayer, line-in encoding
determines how the Sonos Multi-room Music System will encode the data coming in
from these sources. For multi-room audio, we recommend using the Compressed
setting. For the highest quality sound, you can select Uncompressed encoding, but this
selection requires more network bandwidth than compressed audio. For TV or DVD
audio, we recommend using the Uncompressed setting.
Note: You will notice a delay when a line-in source is in use. When the
Uncompressed encoding setting is selected, this delay is significantly
reduced.
Sonos ZonePlayer 90 Setup Guide