Speaker Choice ?

[A Reef Scene]

The speakers I'm want to use for the center are, Dayton RS1805-8 or the Aurum Cantus AC-180 F1. As far as the tweeter I wanted to use a Morel DSM-30. I just don't know which crossover to use. And can It be bi-wired?

[MCH]

You can't successfully buy off the shelf cross-overs. The cross-over has to designed for the drivers used and the specified cabinet. You are better off to build something that already has a proven design. I also recommend that you use similar speakers for the center that are used in your mains.
just a thought

[jocko_nc]

Like he said... The crossover needs to match the natural characteristics of the system. Nailing the crossover is paramount.

You can copy a proven design or ask for help designing your own. The PartsExpress DIY forums are an excellent resource. If you ask, someone there will likely model a design for you.

jocko