Series? Hell no. Crossover accuracy is not exactly the pinnacle of amp qualities...but it IS right there on the short list. For a true audiophile, an A/B amp (lives up to the AB rep of Freq range), stable and REGULATED at any impedence with a near precise crossover will provide out of this world SQ. And at double its rated power, no less. A crossover network like this allows you to defeat the headunit settings - something I completely agree with Focal about - and use purely your amps setting. Flattest response, cleanest response, raw efficient sound. JL designed these amps to say - Bench test?? We dont' need no stinking bench test. They dont' bench test all that well. However, everything changes when speakers are connected. The tests are completely different (maybe some people have never realized this?). Would I take a Mac over it? YES SIR. But the point is, its not just a cookie-cutter unit with flashy name. Its a damn good amp with unique qualities.