Dayton Audio Max-X 10" Subwoofer in a 1.5 cuft Ported Enclosure Josef Anton Hofmann was a physicist, audio expert and entrepreneur. In addition to earning Ph.D. in physics from Harvard and working on the Manhattan Project he was a co-founder or partner in no less then three groundbreaking audio companies; KLH (the H stood for Hofmann), Advent, and Acoustic Research. These companies, which today are all shells of their former selves, were the giants in hi-fidelity home audio back in their heyday. Acoustic Research, for example, was the first company to produce an acoustic suspension (i.e. sealed) loudspeaker. Interestingly enough a simple sealed speaker enclosure was not invented until the 1950's by Edgar Villchur, the founder and president of Acoustic Research, while the vented enclosure was patented by a scientist Bell Labs in the 1930's. Kicker Comp R 12 in a 2.5 cuft Ported Enclosure We would not have the field of acoustics, much less the market for hi-e