Hello everyone, I recently had the rear left door speaker go bad. I went to crutchfield and ordered the Rockford fosgate R1675X2 to replace the rears. When I replaced them, I noticed the OEM speakers were 2ohm and the new ones are 4ohm. Got in after the replacement and these new ones are much quieter and do not have the same bass nor treble as the OEM ones. Does anyone have recommendations for me? I thought maybe it's because the factory radio isn't strong enough to run these new ones at full potential so maybe I need an amplifier? Should I send back these RFs and get 2ohm ones instead?