Sub IA DR 21". Box will be 8 cubes and I want to tune to about 35-36 hz. This will be a daily driver- needs to sound decent.
Here are my two thoughts. I know I've made quite a few threads but I want to build this box perfect the first time.
1. Rectangular port ~128 square inches port. 45's in the corner.
2. PVC, Schedule 80. ID=9.5", OD=10.75", so thickness=5/8. Leaves me about 8.9 square inches of port. There will be some form of mdf flares on both ends.
3. Other- please specify
**Edit** If you make flares, lmk.