[Coconut]

I’m guessing you have your sub lowpassed around 100hz. If so you definitely are missing a chunk of that midbass. You can test this out by playing a frequency sweep to hear where the null is. However it still might be coming through from the rear speakers depending which HU mode you’re in. Either way it’s not ideal to have your rear speakers handle the midbass since it is directional. What you could do is reconnect the underseat drivers and hook up an inline high pass filter to block out anything below 100hz or whatever your subs low pass is or perhaps AudioControl makes a 2-channel crossover so you can hook up near the factory amp in he trunk.