Splitters and Y-connectors are fine. I'd defy anyone to tell when one is in use.
RCA splitter
Has anyone experience of using an RCA splitter? I’m going to try bi-amping but my preamp has only one set of RCA outputs. I found this https://cdlnz.com/M22F-HRD but don’t know if it’s the best quality splitter available. Any thoughts / reccomendations please?