need help with sound problem...

i have two 15"mtx 4ohm subs in a ported bow also containing 4-4''mids and 4-horn tweeters.i am using a 2-ch power acoustic 600w amp.all speakers are wired inside box 4 speakers for R ch + R sub and same for left channel.this is a factory made digital speaker box with low and high pass filters running to each speaker.i have bridged the amp and am running in series.i noticed some of the highs are not being produced. am i going to have to rewire the box keeping my subs separate from my mids?running amp in non bridged parellel mode left sub does not appear to be operating properly but mids seem okay. where am i going wrong? would really appreciate some informative help. thanks to all who take the time to answer my questions!

                                                                                                                        wyld