It'd be great to have IEMing all solved out in the box.
So how about this, maybe have
- a mic input (that passes phantom power thru, the mic signal inctact)
- a stereo input just for backing tracks or whatever
- an IEM (block?) that can be part of the output config on any preset.
- a built-in wireless transmitter inside the AXE, that outputs whatever mix you made.
- a Fractal quality receiver , where you can hook up your preferred earbuds.
well one can dream.
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So, specifically WRT the wireless part...
All wireless audio solutions are either unreliable, region-locked, low-quality, or expensive (and even the cheap ones are a couple hundred). Want one that's affordable? It'll either be on an unlicensed band and subject to Wifi interference & such, only work in certain cities, or sound... not wonderful. Want one that sounds great all the time and works anywhere (or at least anywhere within one country)? Those start at probably $1.5k. Anyway, I'm guessing Fractal doesn't want to have five versions of the AxeFX IV (one for each of the downsides, plus another for people who just don't want to pay for it at all).
WRT to wanting your AxeFX to essentially contain a built-in private monitor mixer, that might be achievable today, in the AxeFX III, depending on your needs. You could use input 1 for your guitar, input 2 for an external stereo FX loop return, 3 for your mic input (this is where you'll need an external mic preamp), and 4 for a stereo send from the monitor console containing the rest of the band. WRT outputs, 1 could be the stereo external FX loop send, output 2 could be the post-FX loop stereo outputs, output 3 could be an alternate output for like if you use a Leslie or want to send a different signal to the monitor console than to FOH, which leaves output 4 to be the stereo feed to your IEMs.
There are several affordable stand-alone preamps on the market and some of them even have both TRS and XLR outputs which would allow you to send the signal both into your AxeFX and to the PA. If you need a splitter, you could get something like a Radial ProMS2 or Whirlwind SP1X2 or SP1X3, send the direct output (which passes through phantom power) to the PA, and the isolated output to your preamp (and then into your AxeFX). Those splitters I mentioned all cost around $100-$120, and preamps start at probably $50 (and can go up pretty much as high as you want).
Personally, I could go either way on having a preamp & iso split built into the AxeFX. In addition to the use case Agvs is interested in, a built-in preamp could also be used to get a mic'd acoustic guitar into your AxeFX (for reverb and such... or fuzz, I guess, if that's your thing). OTOH, either scenario is probably niche enough that most people wouldn't want to pay much for the extra hardware that's required, and I have no clue what Fractal's cost would be.