So to clarify a few things with the X-Sabre 3: it's top is glass so the internal wireless antenna will work and not have unsightly antennas on the back. Also, this is not the model if you want a bunch of features--this device is simply built for performance with very few frills other than the newest connection method i2s. You can find the headphone amplifier, HDMI ARC, Analog in, other niceties in their different lines. It doesn't even have a way to connect external drives as there's no USB C port! Even the tiny display is likely so there's minimal interference from any of that circuitry. This model is built to stream hi-res audio services like Qobuz 24/192 at top quality. Period.
If you're like me and you're confused about MA's wide array of products...with the help of their technical support we came up with a little "Matrix of Matrix products" that may help you out. This will show you what each current model has and has not implemented to best decide what's best for your needs. Note that the XS3 is the oldest model in the line and the mini 4 Pro is the newest, but that's certainly not the whole picture.
Element series:
I2:
Yes: Std 4-ch Bal HP, Enh CPU, Enh Clock, i2s, 9038Q2M chip, digital vol
No: ARC, Analog in, isolation design, trigger
M2:
Yes: Std 4-ch Bal HP, Enh CPU, Enh Clock, ARC, i2s, 9028Pro chip, digital vol, isolation design, trigger
No: Analog in
X2:
Yes: Enh CPU, Enh 8-ch Bal. HP, Enh Clock, ARC, i2s, Analog in, Sabre 9038Pro chip, array of relay vol, +10dB gain, isolation design, trigger
No:
X2 Pure:
Yes: New toroidal transformer, Dual 9039PRO chip, Enh analog stage, (Other main specs are same as X2)
No: Headphone amp,
-----------------------
Mini-I 4 Pro (Newest):
Yes: Super Enh CPU, Std 4-ch Bal HP, ARC, Analog in, Std Clock, New 9039Q2M chip
No: i2s, LPS
Mini-I 4:
No: HP jack, WI-FI, remote
-----------------------
X-Sabre3 (Best-sounding unit of all MA?)
Yes: Enh CPU, Enh Clock, i2s, 9038Pro Chip, trigger, isolated power/digital/analog, CNC aluminum case
No: ARC, HP Jack, USB local drives, Analog in
X-Sabre is all about the SQ vs the features
----------------------
4-ch Bal HP means 4 independent amplification unit for left and right channel
8-ch Bal HP means 8 independent amplification unit for left and right channel