I'm planning my first SQ set up. I'm thinking of a Hybrid Ovation II 6 Component System for the front and a 12w6v2 in the trunk. My question is: do I need 2 separate amps or can I use a single 4-channel amp (switching it to 3-channel mode to run the set of speakers and the sub)? I know that this sub is dual 4 ohm (this means it can work either as a 2 or 8 ohm speaker). The problem is that most 4-channel amps I have seen have bridged output at 4 ohms...