I would personally avoid these speakers like the plague. I bought 2 pairs brand new, wired them up properly, turned them up to about 1/4 on the amp (so they were a decent listening volume, not particularly loud) and after 15 mins, they started pouring out smoke. There is no possibility that I wired them incorrectly, or exceeded the power ratings.
I then bought 2 pairs of Infinity Reference 6x9s and they have happily been running for years turned up a LOT higher...
This is only my experience, and perhaps I got extremely unlucky by having 2 pairs from the same "bad batch" but I would never touch these speakers again. Apart from this, Vibe stuff is generally quite good for the price although it is definitely towards the budget end of the market.
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If you want a good Active Sub (i.e. has a built-in amplifier), I would recommend the Vibe CBR 12 Evo - good quality, ridiculous volume and reasonable price tag. Just don't bother with the twin one - incredible volume but sacrifices quality...