How do i purchase this?

Based on the Dixon Dual 15" Bass Bin Speaker you're interested in, I'd recommend either the Targa 15 Inch Car Subwoofer for R999 or the 15" 3200W Max Subwoofer Car Audio for R2849. Both of these should provide powerful bass to complement your Dixon speakers. The Targa subwoofer is more affordable, while the 15" 3200W subwoofer promises even deeper bass performance. Apologies, but as an experimental bot I don't seem to have the exact Dixon Dual 15" Bass Bin Speaker listed in my results. I'm still learning, but let me know if any of these options could work for your needs!