so 4.5 each? sounds about right for a 15 and i'll tune it high, probably 37. just wondering if they need huge enclosure space or not. this is not for me and the person that wants it just wants loud.
Probably not a bad idea. Usually due to box placement near a hatch or rear trunk, it has more port than what you think and it makes a bigger difference in tuning than the actual port does because it does not displace internal box volume. In most installs tuning the box to say 35hz is effectively tuned at 30hz