Toole worked at Harman for around 16 years. What he managed to write down is what he studied at one company a.k.a Harman? Let's see how many other giants are out there (just to name a few).....Marantz, Sony, Yamaha, Pioneer, Denon, Luxman, Focal, B&W, Elac, etc, etc, etc, etc...Their collective R&D budgets and resources would tower over whatever Harman gave to Toole. But, somehow, Toole's word is the ultimate bible around here?? Yeah, i've read his book cover to cover and he is just one guy.