Your best bet would be to contact a company that specializes in whole-house audio like Home Theater Direct.
Most likely the red/black wires are one speaker in the zone, and the blue/white wires the second speaker.
You will need an ohm meter to determine the impedance of the speakers you have installed. If they show something between 4-8 ohms, you can use them with a non-NuVo amplifier.
The Ethernet cables I’m guessing go to local wall control panels? You probably won’t be able to use them with anything but NuVo.
Regards,
Wayne A. Pflughaupt