...................I am confused
If you were to hook up the mrd-m1005 amp to 2 swr-1021d speakers (or 1041d for that matter) you will most likely blow them in a few minutes depending on how you hook them up. Sure you can hook the speakers up so it shows a 16ohm or even an 8ohm impedance, but what the hell is the point?
The reason that most car speakers and amplifiers operate at 2 or 4 ohms is simply because we are stepping up the voltage in a power supply from 14.4V to a higher voltage usually around 40V so we try and utilize the power. When you are operating a home theater system, you step down the voltage from 120V.
I stated above that you would get a little under 600W RMS per speaker if you hooked them up for a 2 ohm resistance. If the speakers are listed to handle 200-500W RMS power, why would you want to strap on a larger amp????