Question 1

Can i control personals in ear monitor with our iphones with the mixer built in wifi without having the mixer connect the internet? (like mackie dl16)

Accepted Answer

Yes. I have this mixer and am very happy with it. I think the built in wifi is great for setup, and non-venue use (reharsals etc). The network established by the built in wifi is a local network, so no internet involved. There are 2 different apps to control xr18. X Air (for ios or android) will allow full control of the  mixer from all connected phones/tablets. There's also X Air Q  app that only allows control of inputs and levels to the aux busses, not changing the main mix. Performers get this app to  do "more me" in their monitors without the ability to "accidentally" mute another performer.

Now, if you're going to use this where there are other wifi, people with phones. dang near any public place, please buy a cheap wifi router. I bought a $10 Belkin at Ollie's closeout store and it's been fabulous. A good,, current model one will work even better.  Many advantages: Stronger signal, ability to put router and antennas up high, use 5g instead of 2.4mhz (faster, fewer idiots with phones trying to connect to your mixer, etc), and you can keep a laptop wired to one of the other ports on the router for control that cannot fail due to wireless problems.

In fact, go to your app store and get the Behringer apps. They have an "offline" simulation mode so you can try em out without  having the mixer yet. And a boatload of youtube vids to teach you how to use it all.

Question 2

Does the mixer have single-channel stereo inputs for keyboards and guitar processers?

Accepted Answer

The mixer is very flexible,  it's all about how you program it. Each input is a mono input. Each input can send to one or both sides of a stereo "main" mix. 
It also has several monitor mix outputs. Each is independent of the main mix. You could configure into a surround sound system, each input can go to an independent different output.
I found some tutorials on Youtube that were very helpful.

Question 3

Will system be able to work if iPad is not present?  For a church. At times the sound system simply needs to be turned on by the priest.

Accepted Answer

The XR will work without using an iPad, Adroid device, or computer, it will remain in the last configuration it was set, however, there won't be any control at all, therefore, the volumens, EQ and any other setting cannot me controlled.

Question 4

Does the mixer support phantom power?

Accepted Answer

yes it does

ASIN	B00UD3IWB8
Audio Input	USB
Best Sellers Rank	#13,360 in Musical Instruments ( See Top 100 in Musical Instruments ) #18 in Stage Powered Mixers
Brand Name	Behringer
Connectivity Technology	USB
Customer Reviews	4.7 4.7 out of 5 stars (681)
Frequency	2.4 GHz
Global Trade Identification Number	00748252151049
Item Weight	3.2 Kilograms
Manufacturer	Music Tribe
Manufacturer Part Number	XR18
Model Number	X AIR XR18
Number of Channels	18
Output Connector Type	XLR, TRS
Power Source	Corded Electric
UPC	748252151049
Unit Count	1.0 Count
Warranty Description	-.

XR18 Mesa de mezclas digital, Klark Teknik, X AIR

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