You can’t connect a CD player directly to the X1.
You also cannot (to my knowledge) directly connect the USB output of a computer to the X1. The connection is through the network.
Why would you want to? Depending on the size of your library, a computer is a better way of storing and organising a large collection of music files, particularly if it is updated frequently. Using the network the X1 is isolated from noise from either the PC or the hard drive. You can use other software such as Roon or JRiver rather than the Lumin app. I use Roon primarily and stream from my PC.
You also cannot (to my knowledge) directly connect the USB output of a computer to the X1. The connection is through the network.
Why would you want to? Depending on the size of your library, a computer is a better way of storing and organising a large collection of music files, particularly if it is updated frequently. Using the network the X1 is isolated from noise from either the PC or the hard drive. You can use other software such as Roon or JRiver rather than the Lumin app. I use Roon primarily and stream from my PC.