dacheatham 10+ year member
CarAudio.com Veteran
I have a pair of U15s and have tried them in a ~8cf box and a 6cf box. They were much louder and impactful in the 6cft box. I had around 3k on each and it was a little much. I would stick to 2k in a larger box, especially if you tune low.
The U does share some tech with the X but Sundown is pretty explicit when they state it it is not one of the new “low” platform. It is much more like an upgraded SA. That is why they recommend tuning in the mid 30s.
Why not go with the X 15s? It looks like the box size would work
The U does share some tech with the X but Sundown is pretty explicit when they state it it is not one of the new “low” platform. It is much more like an upgraded SA. That is why they recommend tuning in the mid 30s.
Why not go with the X 15s? It looks like the box size would work