I am trying to upgrade the subwoofer to add a little more low end on my boat... Part of the problem is finding access because its hidden under the helm seat I believe. Judging by the rest of my system i'm pretty sure the subwoofer in the boat is a Rockford Fosgate PM210S4 4-ohm subwoofer. My question is... If I swap the subwoofer for a 2-ohm speaker what will happen? My subwoofer amplifier is a PBR300X1 which is rated at only 75 watts RMS on a 4-ohm speaker but is rated at 150 watts RMS on a 2-ohm speaker (and it actually states in the manual its rated at 300 watts RMS for a 1-ohm speaker also, but I can't find any 1-ohm subwoofers). By getting a more efficient speaker I should be hearing a lot more bass, no?