I doubt there are any components in Bose headphones that are in an RCA table radio. Do you mean the drivers? These are obviously purpose-built for headphones, as they're much to small to be speakers in a radio! What other "components" are in headphones? There are no crossover components, as there is a single driver with each ear, as with the vast majority of headphones. I don't know what you imagine the inside of other manufacturer's headphones to look like. Do you take THEM apart? "Internal acoustics" as you put it actually have virtually nothing to do with what components look like! And to my knowledge, as with most headphones, there are no "electronics" (resistors, capacitors, crossover networks, transistors, tubes(?), transformers, etc.) in Bose headphones! Strictly speaking, transducers are not "electronics". "Electronics" are components like amplifiers, tuners, cd players, tape decks, etc.
As for frequency response graphs, you are aware that there is no agreed-upon standard for how to measure it, let alone what constitutes proper response in a headphone. Speakers are quite different, as constructive comparisons CAN be made, as room "acoustics" remain constant from model to model under comparison. But with headphones, each set of ears interfaces with the damn things differently. Outer ears and canals vary widely in shape and size, thus in how they change the response of a headphone.
Around-ear headphones are affected by the shape/size of the outer-ears and head. On-Ear headphones are less affected, because they sit on the ear, and fire sound down the ear canal. In-ear monitors less so still, as they sit IN the ear canal, thus bypassing completely the outer-ears and ear canals.
Then there's the matter of microphones and artificial "heads" for measuring frequency response in headphones. There is no direct way to measure frequency response in a headphone (or speaker), as a microphone must be employed. None of THEM are perfect (although measurement microphones can be quite flat in response). Since it's not practical to shove a microphone down the ear canal of a live person, and it would change the sound if you were able to, microphones must be placed in some kind of "dummy head". And THESE both vary, and change the sound as well. Thus, any frequency response graph with headphones would be useful ONLY if other graphs used for comparison were made ON THE SAME DUMMY HEAD, with the same microphones. Add to this the complication that varying sizes and shapes of headphone earcups insure that even if you used the same dummy head and microphone for each comparison, you STILL wouldn't be getting uniform measurements, as driver distance and orientation varies widely from model to model.
When considering the above, it's not at all unreasonable to leave out the measurements, and suggest LISTENING TO MUSIC to decide about sound quality.
So what does it look like behind the drivers of my headphones? I DON'T FREAKING CARE! And as for the plug (not jack) on the left earpiece, far from being likely to fail, insures that the most unreliable thing in headphone, THE FREAKING CORD, can be replaced with a standard type available at any Radio Shack or Wal-Mart. I've been through too many headphones to remember during 35+ years of radio and recording. I've NEVER blown a driver in one(!) NEVER had internal wiring to fail(!) Not once. But virtually every one that has failed did so because the connection in the cord...between the earcups and plug...failed. So eliminating THAT variable virtually guarantees the Bose OE 'phones WILL LAST LONGER THAN OTHER MODELS!
Far from the shoddy workmanship you describe, the fit and finish of my Bose headphones is first class. The adjustment steps for the headband snap smartly into place in a way that they haven't on numerous far more expensive 'phones I've owned. All pieces fit tightly and securely, so there are no rattles, as on some expensive headphones I've owned. Two different cord lengths were included, as was a neat little beautifully made storage/carrying case. As for what the backs of the drivers look like, and whether the solder-joints LOOK GOOD, I don't freaking care! Quality of solder-joints is something audiophiles, with amps manufactured in lots of dozens (or fewer), sometimes in people's garages (or factories on about that scale) certainly don't want to visit! Most products of American (or British) electronics manufacturers wouldn't pass the same fit and finish and soldering standards as Japanese or German manufacturers. And as long as the electrical connections are solid, IT DOESN'T MATTER!
Perhaps it's because I'm legally blind, but I TRULY DON'T CARE HOW THINGS LOOK! I care HOW THEY SOUND!
Dude, name a single component (including part number, source, etc.) found in Bose headphones that's also in your RCA table radio. Come on, I dare you. Don't tell me it "looks like" parts from your radio. NAME THE SPECIFIC PART THAT'S THE SAME. I won't hold my breath!
As for Bose 'phones beign "euphonic", that simply means they sound pleasant, or that their colorations are pleasing. Since all heaphones deviate from neutrality, the best any of us can do is choose 'phones with imperfections we can at worst tolerate, or at best find pleasing. The stronger argument is that ALL headphones that you or I like are to us "euphonic" (wouldn't "Euphonic" be a great brand name? Perhaps not!)
The most amusing thing you've written? "I find their business paractices deplorable (unless you're into making money)." Uh...I'm guessing you've never owned a business. Who isn't "into making money"? It's fundamental to any business, if they want to remain IN BUSINESS! The primary goal of a business MUST BE to make money, otherwise it won't be able to do anything else worthwhile, because it will cease to exist!
I've never owned Bose speakers. I find the idea of direct/reflecting speakers quite offensive...introducing random reflections from room acoustics into reproduced sound, which already contain the acoustics of the recording venue. Then there's the matter of image specificity...the holy grail for some audiophones. Direct/reflecting speakers simply destroy the stereo image the engineer and producer wanted us to hear. However, on casual listening I've found Bose speakers which AREN'T "direct/reflecting" to sound rather pleasant. I've never done serious comparisons, as I've never considered buying them. I've owned speakers through the years from Advent (remember them), Avid (the old company from the 70s), Genesis, DCM (the original "Time Window"), Boston Acoustics, Phase Tech, Allison Acoustics, Polk, Mordaunt-Short, and most recently Energy (I love my C-3s, which sound great, with real bass extension in my small room). I don't expect I'll ever buy Bose speakers. But I don't think I'll ever buy Sony or Onkyo speakers either. Most electronics manufacturers don't make the best speakers. There are a few exceptions, but very few. But when Bose does something right, as they did when they found fhe flaws in the FMX noise reduction system for FM radio in the late 80s, when they pioneered active noise-cancelling technology for headphones (not that I'd buy noise-cancelling headphones!), or when they make 'phones which actually sound very nice (as is the case, to my ears, with the Bose OE), the deserve praise...or at least respect.