For sure . I will definitely try the highpass route . I ' d have to double check that I can set the freq for the filter on the amp . Sadly but happily , I did a very seamless install where the amp is inside the dash . which now means it ' s unnoticed and doesn ' t limit any of the limited space i have . but also means it ' s not the easiest to get to . Yeah I think I ' m going to have to get a sub . What ' s your thoughts on an underseat sub ? I personally don ' t like the idea of a trunk sub because it ' s a convertible . I ' m sure it ' d be fine and all that , and I can make a nice quick release setup . but I ' m leaning more towards an underseat sub for the compactness , and the solidity of the installation that can be seamless , and unseen .