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you have to remember that the IEM's are not dynamic drivers.
There are quite a few dual dynamic driver IEMs out there, although more than that I don't think I've seen before.
BAs + Dynamic isn't all that rare either.
There ARE in fact some headphones with multiple drivers per side... let's say that in recent days there's only a few cases of them still happening as far as I know:
-Gaming headphones (the surround sound type specially; probably not audiophile approved)
-Dedicated subwoofer type of diaphragm added for extra bass (can't say the result is good; some people might disagree)
In other cases, there are some vintage headphones that have multiple drivers per side. Some of them will require more than one set of plugs to run them... which may be a problem with today's equipment, or just needlessly expensive to make work.
Then there was the Beats Solo HD that used something similar as I recall. Not entirely sure if that's still being done.
Surely there are a few odd/special ones here and there within modern headphones but it's not a widespread practice.
What you should know though is that IEMs and headphones don't play the same ball game. I'm not really an expert at it either so my explanation may not be completely correct... but just a bit of info for your own reading pleasure.
IEMs with multiple drivers sometimes have dedicated canals for each driver or each driver group, in order not to congest and mix too much the sound coming out of different drivers before it gets to your ears. All this happens inside the IEM, and is doable because the drivers are small.
When it comes to full sized headphones, your drivers are much larger as well so employing the same canal technique may be problematic in size and form, but also might make things sounds more unnatural
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