Here's what i have decided to come up with: Yamaha R-V1105 receiver 85w*5 Gr Research AV1+s as mains. AV1+ shielded as center GR av1s as rears Ported Adire Tempest sonotube with 160L volume, 6" port tuned to 20hz. Yes, i know this is kinda small but high SPL midbass is very important to me. Size is another major concern. According to LSPCAD (If im using it right)I should still get fairly flat IN ROOM response between 20hz and 70hz. Group Delay is about 21ms @ 20hz. Does this setup sound good or should i change something?