I enjoyed the Bud Fried comments above. I had the original Fried H which had satellites for each channel and a center subwoofer with twin transmission lines. Fried later came out with the M which used the same satellites placed on top of a separate subwoofer for each channel. The M had better integration of drivers. I later built O subwoofers which were similar to the M but used a 10" woofer, and I placed the H satellites on top of the subwoofer. My brother continues to use that system to this day. Despite the passing of over 30 years, they still sound really good.
As far as I can tell, these designs by Bud Fried were really the origin of the Watt/Puppy concept.