Would the HIFONICS BXi2006D be an upgrade over a Power Acoustik A2400DB or are they pretty even an output. I'm planning on getting either 2 RL-P 15's or a TC-3000 15 and I wanna make sure I have enough power to push them well. Also if I decide to go with the TC-3000 will one of those amps be able to push 2 if I want to add another 15 later on?