Re: 2 12's or 1 18
I use to have a 18" FI SP4 and switched to my current setup of two Sundown SA 12". Power was identical and the difference in SPL was negligible, however I saved a lot of room going to two 12". The 12's are in a 4cf enclosure, where as the 18" was in a 8cf enclosure. If space is a concern, go with the 12's, if not I'd go with the 18" for the wow factor
2011 Honda Civic LX
Head Unit: Kenwood DDX419
Components: Image Dynamics CXS62 v.2 powered by an Audioque 200.2
Subwoofers: (2) Sundown SA 12" powered by a Audioque 1200D
"Don't know something because someone told you, know because you did the research, and you understand WHY something is true or false, otherwise you're just doing yourself a disservice."