im thinking hard about swapping my peavey firebass and going the pre-power amp direction to power both of my 2 15 cabs rated 1000 rms @4 ohms. this inuke boast 880 watts per channel @4 ohms.my concern is that there are two inputs one for each channel,it also has a switch for stereo,mono and bridge,would i need a preamp with two outputs or how can i make this work?