James, The one RF amp is maybe for the tower for 2 chs and 2 of the chs on the sub. with the other amp for the 6 inboats. The 450.4 is rated at 60x4 at 4 ohms. So would be a little light to power the Double Up. One option would be the bridge that amp into 2 chs. It will do 200x2. Use that to power the MB-8 portion of the Double Up. Then get another amp to power the PRO 60's and the Sub. Something that is 125x4. For instance, we use our Wet Sounds SYN-4 amp that does 125x4 and in 3 ch mode 125x2 and 400x1. So 125 to each PRO 60 and 400 to the sub. Or the alpine you mentioned that is the 4 x 150. Tim Wet Sounds
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