I'm jumping into my first DIY speaker project just because I've always wanted a full range loudspeaker. Seems that the Voigt Pipe & ML TQWT designs are similar enough that I jumped straight into building one. I originally planned to use Martin King's bass extension tube from Parts Express (or Madisound), but reading his updates on that design it seems the bass performance was lacking. However, the Voigt Pipe folks who make theirs into a horn bottom (rectangular cutout with angled wood at bottom) seem to note remarkable bass (for the design!). Anybody that has built these both care to enlighten me? Please, no reference to formulas on Martin's site - just colored opinions please. :)
I'm leaning towards a horn end design and using the Fostex FE166E.