First of all, those cube speakers are designed to be used with that Godforsaken Acoustimass module. The crossovers will not work well with anything else and those cube speakers won't go very low in frequency. You are seriously lacking midrange using those cube speakers, especially matched to a true subwoofer.
Realistically, you should get new speakers. If that is not an option, even with decent crossover settings on the woofer (80Hz) and the receiver (speakers at 200Hz, since that's about the lowest they go) you will be lacking mids.
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