Are the diamond audio tdx 10" d4, a good speaker?And is it true that you have to run them ported or they sound like crap? The place i was gonna buy my sub from said they would hook me up with a tdx 10 for $450.00 with tax included and a 3 year warranty... I am looking to put a nice system in a car that i am buying, dont know what car yet probably just a 2 door car. Probably more or less gonna have to be a cheap car like a cavalier.. I am more into my audio not what my car is.. so i am trying to find the best cheapest car to put something in i can enjoy.. But i want some high db levels.. not too high but high enough to make you feel your ears move!!! I already have a mtx thunder 1501d amp. Will that be sufficent.