This is the left rear fill speaker.  It is a Studio Driver MW64 6.5 inch midbass, crossed over from 65Hz to 3000hz.
Focal 5ws Sub woofers were fitted into the factory front door locations to provide the bass details up front.
Rear  structures that hold the 6.5 inch Studio Driver MW64 mid-bass drivrers seen below. These wood structures have since been covered top and bottom with Dynamate Extreme and a custom tuned low pass 3K Xover was added to each side to limit the highs from the 6.5  rear fills.
The front kick panels are in thier final configurations the two pics below show them as they are now..  You can see how the the rough chambers were built above.
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