Matching RMS amps for speakers

The components are probably 4-ohm.  Just run them straight up to two separate amplifier channels.

For a single sub I prefer a class-d mono amp.  Anything from RF will be solid.  Try to roughly match RMS... but it really isn't that important if (a) you aren't an idiot with the volume control / gain setting and (b) aren't looking to compete or expect more from your system than is realistic.

Yes, the 2 4ohm vcs will be wired in parallel at 2 ohms.

See http://www.bcae1.com/ for a lot of great information.

Good luck.

You have to have speakers installed, or at least temporarily hooked up, that will take the full power of an amplifier in order to successfully set the amplifier gains.  Look at the gain setting procedure;  if you use the best street method, it is to listen for the clipped signal while playing a sine wave with a test tone source.  If your speakers aren't rated to handle that amount of power for at least a little while, you stand the chance of burning them up before you get the gains set.

So you are left with setting the gains using either an o-scope or a digital multimeter.  Not many people have the scopes and are used to using them, so I'm guessing you'd go the meter route.  You would have to use Ohm's Law calculations to determine the target voltage output to meet the RMS of your speakers and set the gains that way.  This is not a listening test, so you would have your speakers disconnected while doing so.

You can't use a relative position of a gain control as a guide, e.g. turning it to the halfway point.  That doesn't tell you anything.  You either have to see the wave clip with a scope, listen for a clipped signal, or calculate and read a voltage output.  If you are going to use an amplifier that is rated at a higher output than your speakers can handle, you HAVE to go through the proper gain-setting procedures by the book so that you can protect your speakers from being overpowered.