For me the pre amp is the hub of all the components.
Streamer & cd player to DAC. DAC to preamp, tt to preamp, one pre out to sub, 2nd pre out to main amp.
I use a old recapped Carver c4000. Attenuators for high & low HZ, balance, filters, an awesume sonic holograghy feature which enhances soundstage.
Even has a built in amp for time delay speakers. I dont use it anymore but it gave a nice concert hall effect or " opened up" a small room.