The TB titanium is a great driver, but it does require a notch filter to tame the ringing at 10khz. TB seems to have two quality levels, the lower incorporating a stamped frame and the better quality having a cast frame. The titanium and the bamboo cone models both have the cast frame and are priced accordingly. However, having used both the TB titanium and the CSS FR-125 I believe I would spend the extra $30 and use the CSS. It requires no filter of any kind and sounds wonderful.