Hello Dmn23,
Hope you are well. All connectors introduce some loss/degradation, the amount depends on the quality of the connector, guage of wire etc...
To prevent signal loss and maintain the gain of the line level output, you would have to use a distribution amplifier. Most of us would not notice the signal degradation of a good quality Y splitter if less than 20 foot distance from source to destination. We compensate by turning the volume of the destination up a bit. If you want to go beyond 20 feet a distribution amp would be highly recommended, along with using RG-6 Coax cable to reduce signal loss.
Later,
TonyM
