> So should codecs and amps inside of mobile devices. Those things belong with the transducer, so they can be tuned to the characteristics of the transducer.
Amplifiers/DACs are not simple devices that can be crammed into a pair of headphones without significant compromises in audio quality. The DAC in an iPhone is acceptable for most uses but an amplifier requires a fairly large quantity of discretes and a large power source to drive many headphones. Here are some pictures of the inside of a minimalist audiophile headphone amplifier (Objective2), and with the DAC daughterboard added:
Furthermore, if the DAC/amp are internal to the headphones then the headphones themselves become significantly more expensive. For high-end usage most users will want to use their DAC/amp with multiple pairs of headphones, it's cost-ineffective to have a $200 DAC/amp unit built in to every single pair of headphones. Consumer gear is also cheaper, but you're still talking about the difference between a pair of headphones costing $30 and costing $50.
Also, there's not really any consensus on what "proper tuning" actually means with headphones. Some people like an absolutely flat "reference/analytical" sound, but this is only a small subset of high-end users, and consumer gear is not tuned anywhere near a flat response curve. And it's a highly perception-based area where different individuals hear totally different aspects of headphones, with a high degree of placebo effect.
The long-term fix for audiophile users is probably going to be to move to external DAC/amp units rather than integrating the DAC/amp into the headphones. This means yet another thing you have to carry around and keep charged (my Fiio X5ii lasts maybe 6-8h on a charge). I'm not currently aware of any that use Lightning, but if there's a market they will eventually exist. Consumer users probably won't care about the negative impacts on quality too much, but rather about how Lightning headsets are now going to be quite a bit more expensive.
Headphones have a lot more room for electronics and than do phones. Even a small volume-control module in line in an in-ear headphones would have a lot more room than is currently used by the audio circuitry in a phone.
> The long-term fix for audiophile users is probably going to be to move to external DAC/amp units
That's the current solution for audiophiles, and digital music connections, wired or wireless, will support this better.
Amplifiers/DACs are not simple devices that can be crammed into a pair of headphones without significant compromises in audio quality. The DAC in an iPhone is acceptable for most uses but an amplifier requires a fairly large quantity of discretes and a large power source to drive many headphones. Here are some pictures of the inside of a minimalist audiophile headphone amplifier (Objective2), and with the DAC daughterboard added:
http://teribil-audio.com/wp-content/uploads/2012/07/D300-766...
http://4.bp.blogspot.com/-9lKWLE_sO84/UDUDtC2ApHI/AAAAAAAABB...
Furthermore, if the DAC/amp are internal to the headphones then the headphones themselves become significantly more expensive. For high-end usage most users will want to use their DAC/amp with multiple pairs of headphones, it's cost-ineffective to have a $200 DAC/amp unit built in to every single pair of headphones. Consumer gear is also cheaper, but you're still talking about the difference between a pair of headphones costing $30 and costing $50.
Also, there's not really any consensus on what "proper tuning" actually means with headphones. Some people like an absolutely flat "reference/analytical" sound, but this is only a small subset of high-end users, and consumer gear is not tuned anywhere near a flat response curve. And it's a highly perception-based area where different individuals hear totally different aspects of headphones, with a high degree of placebo effect.
The long-term fix for audiophile users is probably going to be to move to external DAC/amp units rather than integrating the DAC/amp into the headphones. This means yet another thing you have to carry around and keep charged (my Fiio X5ii lasts maybe 6-8h on a charge). I'm not currently aware of any that use Lightning, but if there's a market they will eventually exist. Consumer users probably won't care about the negative impacts on quality too much, but rather about how Lightning headsets are now going to be quite a bit more expensive.