i'm a JBL fan, due to gila-gila stereo...i purchased
CS series Sub - good as price vs affordability & made in USA
GTO607C - no good coz speaker cone too hard. looks & feel very cheap. made in tong san or china. tweeter is cheap. JBL dont sound like this ...i prefer previous JBL USA series where the speaker cone is paper.
GTO6506C (something like that) - i got the 5" version. install in Kancil with cheepo amp. performance is value for money.
bottom line, look for JBL USA series, if you wanna J.B.L !
( no offense for those JBL users) !