The (35" x 22" x 13") dimensions I gave you were inside dimensions. My dimensions create a box with 5.7ft3 internal volume. The additional size makes up for displacement from the parts inside.
Your (30" x 20" x 20") dimensions make a box with larger internal volume, 7ft3 to be precise. That 2ft3 is more than would be displaced by the parts.
You could go with (30" x 19" x 17"). That's pretty close to the volume of my original dimensions.
It doesn't have to be exact. Thermal changes at various power levels make more difference than a small volume or tuning change in the box. But still, try to keep it within +/- 10% of 5ft3. Otherwise, you should modify the ports accordingly.
Well here for port 3-1/2" and 4-1/2" pvc pipes are avilable can u plz tell me the port size in these sizes
Or i will make square shape with mdf wood thanks
I think square shape with mdf wood will be best
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