People can't tell the difference because our ears ONLY hear analog. This is not about analog (3.5mm) vs. digital (lightning) such that the latter is automatically better because it's digital. Our ears can NOT hear digital. So what happens here is the digital music file just moves a little bit further down the pipe (into one of these dongles) where it is converted to analog there (maybe 3 inches away from where it used to be converted to analog
inside iPhones before the "7"). That short distance doesn't offer any classic "maintain an all-digital signal for as far as you can" benefit.
On a hardware basis, for us to
hear a difference, it will be about the DAC and amplifier quality inside the dongle. If that's better than the one Apple chooses inside the iPhone, some ears might be able to hear a slight difference in audio quality. But that would mean 2 things:
- it will almost certainly come at a price premium. The cheap dongles are probably not going to have high quality DACs & Amps. And since this is almost a single use adapter, are people going to be quick to pay up $79, $149, $349 for such an adapter vs. the $12.95 or $19.95 Chinese knockoffs that will quickly hit stores. Will the masses even be audio savvy enough to think about why the adapter that is priced 5X or 10X more is actually better than the one they can pickup at Revco or CVS like a flash drive for maybe $12. If people buy the cheap adapters, I don't expect any ears to hear any better quality.
- The faithful would be put in a tough position of having to rationalize Apple's decision here (always genius of course) while admitting the tech Apple still has INSIDE the phone is inferior to third party (same) tech built into these dongles. In short, this would be admitting Apple's iPhone DAC < (say) Samsungs DAC (in a Samsung-made adapter). That's going to be some fun spin to watch as it's slung. I can already imagine arguments being made that the one in the iPhone is a better DAC but the audio via the Samsung adapter is better because Apple has it flowing through Lightning. In other words, Apple is better and Apple is better... and Samsung is still crooked, copycats
The common confusion about this change is that this is going to yield BETTER sounding audio. That's not automatic. If all it takes for better sounding audio is connecting via Lightning or Bluetooth, both options are ALREADY available but neither seems to be winning the masses over. Why not (if they sound a lot better)? Some of the closet marketers here have already started arguing that we're all too stupid to embrace "the future" unless Apple forces us there by taking away ubiquity ("antiquated") so that we have to embrace proprietary. Cue Henry Ford "faster horses" quotes.
Another way for ears to hear better-sounding audio would be to update the AAC standard again so that we are actually getting higher quality music files. As I watch this rollout approach and as other rumors imply larger base storage, I'm increasingly thinking how Apple sells some acceptance of this change is through that combination. In other words, upgrade the quality of the music file itself and roll them out with this change. That will get people and the press talking about better sounding music, implying that switching to Lightning yielded this audio upgrade. But, of course, higher quality music files would sound better through 3.5mm too.
And the last way for our ears to hear better-sounding audio would be if- as some are speculating- Apple goes wireless here but rolls out a new wireless standard that overcomes the many issues with Bluetooth wireless "as is." Of course, that would be thoroughly proprietary and thus probably not connect with anything other than Apple hardware but if "the future" really is wireless and that "the future" is to be thrust upon us dummies this Fall (because we're too stupid to embrace it's superiority without forcing it upon us) a new wireless audio standard seems mandatory.
So saddle up boys and ride your "faster horses" on over to the Apple store this Fall to hear "the future." Don't bring the headphones that already & readily work with both your iDevices and Macs (and everything else you encounter). While there you can buy your new headphones that only work with iDevices and/or pay up for duplicate technology in a "tail" that will still have to exist inside the iPhone too so that it can be used as a phone.