There's an old saying that the way to boil a frog is to put it into a pot of cold water, put the pot on the stove, and light the burner: As the water begins to heat up, the story goes, the frog will first enjoy the pleasing warmth; and then, as the warming increases, he will relax, and possibly even fall asleep, as any of us might do in a nice hot bath. As the heating process continues beyond that point, the frog apparently gets used to, and stays in, water at temperatures that might - if he were exposed to them without prior buildup - otherwise cause him to immediately leap out and flee for his life. No such thing happens, however, and finally, we are told that the frog, still in the water, is so debilitated by the increasing heat that he lacks the strength (and perhaps even the will) to save himself, and passes on to whatever better world might await him.
Personally, I have never had the desire to own or to do whatever one does with a boiled frog, so I can give neither any personal verification nor any endorsement to this frog-boiling technique. For those so inclined, however, I DO think that this might be the perfect opportunity to do some of that double-blind testing a number of our readers so eagerly tout. They might even find the frog legs helpful in their leap (Gaaah!) to conclusions.
No, please, let me assure you that, even though beginning this article as I did allowed me to slip in that last horrible pun, the pun was not my sole purpose in bringing up the frog-boiling thing: In fact, I think that "How to Boil a Frog" is a perfect illustration - although in reverse - for what we and our hobby are being exposed to all the time.
The first really great leap (see, there it is again) in the popularity of HiFi and stereo followed the introduction of the stereo LP record and the very quickly developing near-ubiquity of stereophonic sound in the movies. Whether those events were coincidental, or one keyed the other (and if so, which one did what), I really have no idea. The fact, though, is that once the public indicated its interest in better - or at least showier sound -- the entertainment industry and major consumer products manufacturers saw their opportunity to capitalize on it and, for at least a while, stereo sound enjoyed the same popular success that had made "3D" a "buzz-word" just a few years earlier.
And just as "3D Dry-cleaners", "3D drive-in restaurants", "3D donut shops", and any number of other "3D-themed" businesses popped-up to take advantage of the popularity of 3D movies (Bwana Devil, for example, and House of Wax -- the first 3D movie with full stereophonic sound) and, in so doing blurred and cheapened the public's idea of what "3D" was all about, so, also, did the popularization of HiFi and stereo change what was presented to the public to take advantage of their interest.
The first big commercial development following HiFi's initial bloom was the appearance-over-time of what we now know as "mid-fi".
In the very beginning, HiFi was not even an industry, but a largely do-it-yourself movement of technically-oriented enthusiasts producing better sound for their own enjoyment. How long that early phase may have lasted is uncertain, but some believe it to have been twenty years or even more. By the end of the '50s, though, most of the great "classic" HiFi brands (Fisher, H.H. Scott, McIntosh, Harman-Kardon, Bozak, Altec, JBL (originally James B. Lansing Sound, Inc.), Marantz, and, in England, Quad, Tannoy, Wharfedale, etc.) had been established and had developed a solid enthusiast following. With HiFi's (and later, Stereo's) growing interest and popularity, other brands started coming-in from Asia - usually, interestingly enough, of solid high-performance gear like Luxman, Denon, Yamaha, and others.
Those were attracted to the U.S. by its nicely-established little market for high performance audio gear and their success here served to attract others who sought to expand that market and to compete in it more with price or features than with quality.
Thus the birth of "Mid-Fi" - products claiming to be HiFi, only at more affordable prices (and with more knobs and dials), but that were, in fact, little more than just jumped-up (another pun?) appliances, going after a market of innocents aspiring to HiFi stereo sound but having neither the money to buy what they wanted nor the perception and experience to recognize that they were getting something less than that.