The Vofo is a tapered quarter wave tube(TQWT), sometimes referred to as a Voigt Pipe. The design stems from the original work and patent of Paul Voigt in 1934. In his designs Voigt showed that the lower frequencies of a loudspeaker unit could be augmented by adopting a tube whose length was related to the wavelength of the frequencies in question and which presented the optimum load to the unit. In practice the recalcitrant and tricky lower frequencies could be coaxed into responding more prominently or efficiently and bringing them closer to the response of the higher frequencies. The net result of this is a more even response over the entire frequency range.
Constructed entirely using the best 18mm Baltic Birch plywood these cabinets are designed to hopefully minimise any vibration or resonance. Being a quarter wavelength pipe there is nearly 2 metres of tube and radius waveguide to process the wave from the back of the speaker unit, and this needs firm control to prevent unwanted vibration. This firm control is achieved by adopting a solid build, utilising all traditional rabbett and housing joints. The combination of high quality full range driver, narrow baffle, rounded edges and solid build give this loudspeaker the ability to image with amazing clarity.