i just asked this very question on PSW (where they really know this stuff), and so far Link Removed is the answer i've gotten:
my question:
slightly OT, but since we're talking about bar-band IEMs, i have a question:
i've been nursing a beat-up psm400 system for a few years now, and it's getting to be a bit long in the tooth.
digital wireless is the hot new thing (the line 6 relay guitar stuff is getting good grades as far as i can tell, with no companding and thus a more transparent sound), and between that and scary government bandwidth allocation issues, i'm hesitant to just buy a nicer "regular" IEM system. is there going to be a moderately priced (<$1k) digital solution in the near future?
the answer, from someone who apparently provides this stuff for a living:
Digital may be the "hot new thing", but that doesn't necessarily make it a better solution for a particular application. In fact, there are very few digital wireless mics in use in the professional environment. (The notable exception in this country being Zaxcom employed in the TV/film industry, though they by no means have the majority market share, and a rare, specialized application in Broadway/professional theater. Sony has decent presence in ENG applications in Asia and Europe.)
The added latency and inferior propagation characteristics compared to like analog units mean digital IEMs will likely not be devloped and accepted for quite sometime, certainly not sub $1k offerings.
Further, when there finally is a new spectrum re-allocation and/or additional shared services introduced, harmful interference is harmful interference; digital will suffer just as much as analog, likely more so given comparable RF power levels. The only difference is the digital units would go completely silent while analog can get noisey before muted by squelching.
Henry Cohen
Production Radio Rentals