Paul, as Ken mentioned in the other and this thread, your speakers should have come with the gold straps that keep the tweeter, mids, woofer sections in tact. If you have removed these, this would explain possibly your lack of bass, if your speaker wires are only connected to the other terminals.
This is what it should look like, and they should be snugged down. If the straps are in place, then you only need to hook your speakers up to one of the pairs, as the straps will trasmit the signal to the other pair.
