For me, the MTX wins over the V12 anytime. That is if its the Korea or Taiwan V12. If original Alpine then it might be a different story.
Your MTX is a complete 4 channel amp in the sense that it has built in crossovers, bridgable, 2 ohm stable and has enough power for your system.
Try to use your MTX 1st, kung bitin ka sa bass, then you can add another amp. This way you don't spend if you don't need to. But if you really want a 2nd amp, get one that will give you more than the 200 watts the MTX will pump out (bridged mode).
For everyday listening, 200 watts is plenty. My amp thats underrated, is only supposed to give my sub 100 watts. Its good enough for me. However, if you are a bass head or building a SPL sysytem, then you will need more power and possibly more subs.
Anyway, what is the power handling capacity of your Sony sub, in RMS?





