Previously I had an x100.4, and wasn't overly happy with it running my whole system (1 Pr components, and a single sub). It was decent, sounded good, just didn't have teh output I was after.
Well I had a couple Clarion amps kicking around, APX 320.2 and APX 640.2. Installed them, and was pretty happy with it, more output, sounded decent, but still a little lacking in output, especially in the front end.
So, since I will be selling at least one of the Clarion amps, I decided to finally install my x200.4 I have and holy effing shit! I was not prepared for the complete change in sound from my car. Unfortunatly I also destroyed one of my Memphis 6.5s, so I swapped in a pair of BMW 5.25s I was able to keep from a customers car, that I had planned on using for some home surrounds. The bass hits hard, sounds great, even though the box is a peaky box (tuned for output) X12D2, and the front stage sounds PHE-NOM-IN-AL! It's almost to the point where I think it's too loud!
I'm really contemplating using the x200.4 for subs only and swapping in an x100.4 for the front stage. I'd also change the x12D2 to a pair of x10D2s at the same time. Either that or using an x200.2 I have all of these amps and subs in the basement, so it's pretty open.
My ultimate amp system would be an x1200.1 and the x200.4 running thr front stage.
Just wanted to say how happy I am with the x200.4, I just wich I had swapped it in sooner.
I own three Xenon 200.4's. Got one by chance, and bought two more just in case I go crazy or something. Its not a MS-1000 but I am not complaining either. 