I think those Jbl's only come in 2ohm only, not to sure though. I wished more companies would use 2ohm for speakers.
The power rating that they show is misleading. Notice the it puts out 220watts at 14.4 volts, then theres 150watts at 12.6.v. Stock alts put out 14.4 volts but by the time it reaches the battery we are not seeing that. We probably see closer to 14volts. By the time it reaches the amp, depending how far, how much cable used, and what type of cable is used. your probably seeing closer to 13.8-13.5volts. I did the big 3 and used oversized 1/0 welding cable split to two 4 awg, and by the time the power reaches my amps i'm seeing 13.6- 13.8 volts. Realistically, your seeing 150 watts from that PPI.
I wouldn't worry about over powering those components. In the mobile audio world we actually overpower the speakers on purpose. Giving it 2x the power with no problem. We call this head room. It makes it more dynamic more lively and does it with out distorting the speakers cause the amps are at their limit. Real world usage and listening levels. Your not gonna even come close to using all that power. Unless you are listening at 90% of max volume. Plus, you set the gains on the amp to make sure of that.
To give you an example: I'm running 2 JL HD amps. One 1200/1 going to my 12w7, which is rated at 1000 rms, and a 600/4 going to my tweet and mids. I don't use my rears at all, they are actually unplugged. I'm running an active setup. Which means each individual speaker gets its own channel and I'm using my HU processor to tune and set crossover points. Keep in mind that the JL HD amps puts out the amount of said watts no matter if its 14.4 volts or 12.6volts, and the same watts 1.5-4ohms. My tweeters are rated at 30watts rms and mids at 100watts rms. With all that being said. My tweets have 150 watts each and my mids have 150 watts each, and would add more to the mids if I had it. I listen to my music loud and my amps and speakers aren't even breaking a sweat. If you get quality equipment and set your gains right then you don't have to worry about overpowering. just use common sense. Like putting 500 watts to a tiny speaker. If that happened then of course its gonna blow.
With the thd, I wouldn't worry about it to much. The difference is to minute for us to hear it. It's not like we're recommending Pyle, crunch, boss, or any of that type of junk. Those PPI's are good. A lot of guys that build budget SQ systems use them and like them a lot because of their size and power output. That's why they are such a good bang for your buck mainstream amp.