[Atlplasma]

I recently hooked up my M&K sub for a little extra bass. I was wondering about adding a high-pass filter but see that ACI no longer offers this product. I was wondering if anyone could offer an alternative. I saw these on Amazon, but there was no user review.

http://www.amazon.com/FMOD-Crossover-Pair-High-Pass/dp/B0006N41JW/ref=pd_sim_sbs_e_2