Consider that a subwoofer gives you a whole 'nother chance to custom tailor the sound of your system to the realities of your taste, aural sensitivity and listening environment. If your room likes to eat lower frequencies, like mine does, you may want to set your crossover well above the rolloff of your mains.
Do try the Rel line, and experiment to find your best answer.
Do try the Rel line, and experiment to find your best answer.