What sub should i get to compliment my gr av1's? My amp (yamaha rv1105) has a fixed 90hz cutoff for the sub. Im looking at the Adire Tempest and Shiva, blueprint 1201, and Dayton DVC 12, 15". Size is also a concern. 6ft^3 would be the max volume. Im powering it with a PE 250W Amp. Which sub should i choose and why?