@dz13: One thing Danny is criticized for IS resigning some of the loudspeakers sent him. His critics ask: what makes him (or us) think he knows more about designing than the engineers at, say, Klipsch?
Well, in his videos on various Klipsch models, Danny demonstrates exactly what he found to be "wrong" with them. He found the Klipsch crossovers caused the two drivers to be out of phase at the crossover frequency, causing a deep hole in the frequency response there. And when Klipsch introduced the Mk.2 versions of those same models, what had they changed? The crossovers, and in exactly the same way Danny had! So yes, Danny apparently DOES know more than the Klipsch designers. ;-)
On some speakers he finds no serious problems, and merely upgrades the garbage parts used in most loudspeaker crossovers (regardless of price): replacing electrolytic caps with film ones, carbon resistors with film, the terrible binding posts found on most speakers (which contain ferrous parts!) with his own Tube Connectors, etc.
He also addresses the ringing he sees in his spectral decay measurements (waterfall plots) he takes via compensation parts in the crossovers he designs, ringing left unaddressed by the loudspeaker’s designer (whether for financial or other reasons).
With some loudspeakers he finds the problems to be too serious to correct (often because of the drivers themselves), with others not economically justifiable. All of this is what he talks about in his many videos, a free source of valuable information whether you decide to modify your speakers or not. The info also makes you a more informed consumer, more aware of what to look (and listen) for in a loudspeaker you are considering buying.
