Would like opinions on my set-up. Running a sundown audio salt 400.2 pushing 4 sundown audio neo pro 6.5 an 2 bassrockers marine 6.5's. Sundown sia 3500 to a massive Audio hippo xl 122 sub.i have a phd art 2150 an another salt 400.2. A sfb 1000.4, ds18 exl sq 1000.4 and a 600.2. Needing advice...