rockFord_Expedition

No sir, I live in Arizona.

This is the only sensible way to go about it, unless I am misunderstanding something.

I would not do it. Will it work, yes. You will lose not only balance control, but seperate left and right sound. The number 1 reason not to do this, you shouldn't show different ohm loads to different channels on the amp. It would be fine to show a certain ohm load to the rears, and a different to the fronts, but not seperate ohm's within those. If I am understanding you correctly, your front left(or right) channel will see 8 ohms, and the other front channel will see 2 ohms. Bad for the amp and bad for everything hooked up to it.

Or if you have access to a rotary cutting tool like a Dremmel, just bore it out a little. I would do that before I use any adapter on there as that could throw off your readings just a tad if you are not installing that same adapter on your amp.

Have you downloaded Torres's Box Tuning Calculator? That will probably be your best bet as you can fine tune any adjustments you want to make. Many other things to consider like power, and Wood thickness etc...

Impressed but not suprised. We've come to expect greatness as the norm outta you Steve

OP I don't have much wisdom to share about how the design will sound BUT I do have a question that might save you some cutting mistakes... If you go w/ your design that you drew in paint, unless I am reading it wrong, the measurements don't add up... you say your port will be 18.25" high, then it "looks" like you will have a piece of 3/4" MDF, then 4" on the bottom. Finally, you say that the overall height will be 24".... see where I am going? 18.25 + .75 + 4 = 23" Something isn't going to work how you are planning