I'm building a special enclosure for my jl in my mustang and it would be extremely dificult to put in a square port. I wanted to know if someone knew what length and diameter I would need for one or two tubular bass ports (ABS pipe). Some where around 10in long. I'm not sure what the tuning fequency is, couldn't find one on their web site. If you could help me out that would be awesome. Thanks.