Here’s the list of Android devices which report support for the Android Professional Audio standard (by reporting that they have the android.hardware.audio.pro hardware feature). List compiled 3rd March 2017, total devices: 46. I have not verified that these devices actually conform to the Android Professional Audio standard so please run your own tests.
You can obtain this list from Google Play by creating a test app with the following line in the AndroidManifest.xml:
<uses-feature android:required="true" android:name="android.hardware.audio.pro" />
Then upload the app to the Google Play Developer Console and view the list of supported devices.
BLACKBERRY
DTEK60 by BlackBerry– argon
Pixel XL– marlin
Pixel– sailfish
Nexus 9 LTE– flounder_lte
Nexus 6P– angler
Nexus 5X– bullhead
Nexus 9– flounder
GOOGLE CROS
Asus Chromebook Flip C100PA– minnie_cheets
Acer Chromebook R11 (C738T)– cyan_cheets
Chromebook Plus– kevin_cheets
Google Chromebook Pixel (2015)– samus_cheets
NVIDIA
SHIELD Tablet– shieldtablet
SHARP
SH-M04– SH-M04
AQUOS EVER SH-02J– SH-02J
AQUOS L SHV37– FSP_u
Disney Mobile on docomo DM-01J– DM-01J
AQUOS U SHV37– FSP
SONY
Xperia X Performance– F8132
Xperia X– F5122
Xperia Z5– E6603
Xperia XZ– SOV34
Xperia Z4 Tablet– SGP712
Xperia X Performance– SOV33
Xperia X Performance– F8131
Xperia X Compact– SO-02J
Xperia XZ– F8331
Xperia Z5 Compact– E5803
Xperia Z5– E6653
Xperia Z3+ – E6553
Xperia Z5 Premium– E6853
Xperia Z3+ Dual – E6533
Xperia Z4 Tablet– SGP771
Xperia XZ– 601SO
Xperia Z5 dual– E6633
Xperia Z5 dual– E6683
Xperia XZ– F8332
Xperia Z5 Premium Dual– E6833
Xperia X Compact– F5321
Xperia X Performance– SO-04H
Xperia X Performance– 502SO
Xperia XZ– SO-01J
Xperia X– F5121
Xperia Z5 Premium Dual– E6883
Xperia Z5 Compact– E5823
TCT MOBILE LIMITED (ALCATEL)
TCL 950– idol4s_cn
VERTU
Constellation X– tron