hi, i bought a pair of 6x9 DB series (i haven't try them because my car is not build is in the paint shop) and now i need 2 pair more 6.5 one DB or MOMO? coaxial and one DB component system but some friend told me not to get Polk because they have problems with the highs when you turn up the volume and i don't want that, is that true? i love speaker with good highs at any volume level. i have 300.4 JL amp for all that wright now next I'm going to get a 2 channel just for the 6x9, I like to crank it way up every now