If the bass drivers are out of phase, there will be a noticeable decrease in volume and the sound will become "muddy." Turn the treble/mid down or disconnect the tweeters/mids. Give a listen with the current setup (center your ears between the drivers for best results). Swap the wires on one of the woofers. Listen again. Should be obvious which way is correct. This will check the whole system from source to driver. Works best with a monaural source but not a big deal for checking bass.
The battery trick works very well to check the phase of the drivers but you may have a crossed-wire problem somewhere in the pre-amp/amp/crossover wiring train.
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