Well, I think your 6500D is a monoblock amp, correct? If so it can't be "bridged". It will effectively see the total speaker impedence wired to it instead of half of it as when a two channel amp is "bridged mono".
The W6 speakers are dual 6ohm voice coil subs. If you want to show a monoblock amp 2ohms with these your best bet is to use ONE voice coil per sub, and wire all three in parallel.

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blk.99svt
n.e.Ohio


blk.99svt
n.e.Ohio
Never under estimate the power of stupid people in large groups...