Is there such thing as the best rear loaded design for full range driver? I had a FE 166 on a folded transmission line or TQWT(?). I love the mid and the highs but miss the low and tight bass. Has the FE reach already its limit or are there better rear loaded design boxes for this purpose? If I will make another speaker should I decide first this time on box before choosing the sizes of the driver? I listen mostly to jass, pop, classical and a few of rock music. Please enlighten me on this matter as I don't want to be disapointed again.