ad_barv2003

I have this Aiwa "Shelf System." It is an aggressive system, it sounds great and I would like to add speakers to the system. The big dilemma is that there are two channels for each of the left and right speakers (so four ports in all). In other words there is one channel for the low frequencies and one channel for the high frequencies. Well this is an issue because when the two channels are bridged or combined the system completely shuts down! Well on most loud speakers have one port for all speaker types (subs, mids, and tweeters). What in the world can I do?