Leaderboard

This is a under seat box I built last summer for a guy with a pair of the newest X-8's on a Sundown SFB-2000 in a 05 GMC Sierra without doing a seat lift. I built the box a tad larger than spec (cant remember exact size I would need to find my box plans if I still have them) for increased efficiency and to get tuning a little lower than due to limitations on the port length. No issues what so ever. Granted going larger then recommended can turn to a nightmare fast if you don't know what you're doing or know what to listen for mechanically wise on the sub(s). So for the SA-8s if they are the V3 series I probably wouldn't go anything larger than 0.4 - 0.7 cubic feet larger for both subs together. So ideally 1.9 - 2.2 cubic feet after sub/port/bracing displacement is subtracted for your 940ish watts you have. If you go too much larger than that you could potentially run into unloading issues but its hard to say since your not giving the subs their full rms wattage.