Would the phone's output be strong enough for wired IEMs, or do they need headphone amplifiers?

I think that they could, if the IEM was an earbud type.

The product information section above mentions the use of lithium ion battery. what is it used for? what model battery is it?

Holds system settings between sessions. Also brings up last session mix when you boot up and if you don’t need to adjust mixer levels you can perform immediately. No idea what battery it uses.

What is the depth of the Ui24R, meaning how deep would a rack bag or case need to be?

Rack mountable (19") and at least 6inches deep

Can i delay one or two of the aux outputs? also, does anyone know if this is a step up in sound quality from the ui16?

The UI24R has a delay function on the AUX outputs that can be set to whatever you want, which is why the UI24 is a quantum leap from the UI16

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Ui24R Rack-Mountable Laptop or Tablet-Controlled, 24 input Digital Audio Mixer with onboard Signal Processing. Blue and Gray

Product ID: 135633052

Details

Brand
Soundcraft
Connectivity Technology
USB XLR
Item Weight
2.1 kg
Number of Channels
24
Product Dimensions
22"D x 24"W x

📶Dual-band Wi-Fi + Ethernet control

🎚️Studer preamps & dbx processing

🎛️24-channel digital mixer

$3412.24

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Description

🎧 Elevate your sound game with pro-level control and clarity — don’t just mix, master the moment!

VERSATILE CONNECTIVITY - Supports USB, XLR, and instrument inputs for all your audio sources and recording needs.
PRO GRADE SOUND QUALITY - Experience pristine audio with legendary Studer preamps and iconic Lexicon effects built-in.
RACK MOUNTABLE ROAD WARRIOR - Compact, durable design fits perfectly into any professional rack setup for ultimate portability.
SEAMLESS MULTI DEVICE CONTROL - Manage your mix wirelessly from up to 10 devices simultaneously, anywhere in the venue.
AUTOMATIC FEEDBACK SUPPRESSION - dbx AFS2 tech keeps your monitors crystal clear and feedback-free during live shows.

The Soundcraft Ui24R is a 24-input digital audio mixer featuring wireless control via dual-band Wi-Fi and Ethernet, renowned Studer preamps, and professional onboard signal processing including Lexicon effects and dbx compression. Designed for live and studio use, its rack-mountable form factor and multi-device control make it a versatile, road-ready solution trusted by audio professionals.

Specifications

ASIN	B079L75NBL
Audio Input	Microphone, Instrument
Best Sellers Rank	#9,204 in Musical Instruments ( See Top 100 in Musical Instruments ) #41 in DJ Mixers
Brand Name	Soundcraft
Connectivity Technology	USB, XLR
Customer Reviews	4.2 4.2 out of 5 stars (293)
Frequency	20 KHz
Global Trade Identification Number	00688705002675
Item Dimensions D x W x H	22"D x 24"W x 10"H
Item Type Name	Digital Multitrack Recorder
Item Weight	2.1 kg
Manufacturer	Soundcraft
Manufacturer Part Number	Ui24R
Model Number	Ui24R
Number of Channels	24
Number of Items	1
Output Connector Type	XLR
Power Source	Corded Electric
UPC	615435503851 668705002660 688705002668 613815593140 642892803040 632317248006 632317249935 688705002675
Unit Count	1 Count
Voltage	100 volts
Warranty Description	This product is sold by an authorized soundcraft north american dealer and includes the official soundcraft manufacturer’s warranty. The warranty is valid only for products purchased from authorized sellers within the united states. Full details are available on the soundcraft website.

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$3412.24

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

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