The focals can take a lot more power than 70 as long as the amp is producing a clean signal. I have likes and dislikes about the JBL ms-8, for one yes it is easy to tune as long as you know about octs. and crossover freq. However it is limited only but eh 2 volt output which IMO is very poor and low and I would have liked to have seen 4 volt out. However if you are worried about the harshens of your tweeters you should know that the ms-8 is pretty much made to go active and you can easily smooth them out if you know what you are doing.
Sounds great without a center and that is the only way I would run a system. Subs is up to you and where you want to place them and what your looking for as far as bass. I know the ms-8 calibrated the sub as well. I would also say that if your looking to control your sub or use the head units EQ your not going to be able to. The ms-8 pretty much ignores all of that.
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