No you're using all of the coils.
If you sire series parallel you have 2 subs, say d4's, and you wire each one to 8 ohm in series, then you wire the two remaining sets of 8 ohm leads in parallel to 4 ohm.
If you sire series parallel you have 2 subs, say d4's, and you wire each one to 8 ohm in series, then you wire the two remaining sets of 8 ohm leads in parallel to 4 ohm.