thanks guys...I contacted Sherwood and Parts express...both quickly confirmed 80hz...which leaves me in a dilemna...the crossover in the RD 6500 is non-defeatable...however...i would like to crossover higher...as my mains are rated to 85hz(3db down)...should I a)be not concerned, b)set the crossover on my sub to whatever I want which isnt ideal, or c)throw the Sherwood out the window...haha..