Yamaha home cinema to with Gold Phantoms

[Snoopy8]

Hey Snoopy, one simple question for the office set up.
I just ordered another 2 pairs of Phantoms gold which makes it 4 speakers, and I'd like to do the surround stereo system from my turntable and computer. Because I'm limited to 1 optical output from the pre-amp, to split to 4 speakers, shall I just use an optical audio spliter to direct it to 2 speakers who both will be in sterea to make it 4 speakers ?
I found only a few phono pre-amps with optical outputs which are not AV receivers and not ccosting me like 10k usd.

You will have only a stereo signal to feed the optical input to a Reactor.  Why not use the multi room capability of DOS 2 and play stereo to front and back pairs ?  I have not not used multi room, so have no idea how it works.  But some people here have...
https://devialetchat.com/Thread-Multiroom-any-good