I have a 20'x30' room and I have two RWS-15 subs in the front and two JBL-250 in the rear. Witch are two on the right side and two on the left side output. Now I want to install two more subs about midway. What I am looking for is something like maybe a low wattage amp. that would keep the watts up at each sub maybe with a control for all six subs. Then I can adjust them each. If I keep useing Y connector the watts will drop off. Looking for any and all imput.[6]