Topic: Apple Music iOS. RME Bit Tests fail
Hello RME user group, this is my very first post.
I've been using an ADI-2 in my desktop system for over a year - it is a fine product. Thank you!
Like many, I was excited to learn about the introduction of Apple Music's high-res and lossless streaming. So I though tI'd see if the RME bit test files pass when played through Apple Music app on MacOS 12.3.1 and iOS 15.4.1. I can't believe I'm the only one who has thought of this, so feel free to let me know if this has been covered before. I posted this in a couple of other forums but haven't received much feedback.
Here are the results:
On MacOS, the RME WAV test files all pass - as long as correct sample rate is switched in the Apple MIDI app before the test files are played with the Music App. Music must be restarted after each sample rate switch however.
The results are quite different on iOS. I turned off the Apple Music sync function and copied the RME WAV test files over to my iPhone (one has to turn off the sync music function in the MacOS Music app to copy personal files over. I verified the files are the exact same size in the Storage app in iOS. High res streaming was turned On and all DSP functions and sound check were turned off for this test. the RME as connected to my iPhone by USB via an Apple CCK.
I first played the files through the handy Onkyo HF player and all the 16 and 24 bit tests passed! (The 32bit files pass as 24 bit as expected). Good start!
I then played the same files through the Music App on iOS and here are the results:
16/48 - Failed
24/48 - Returned “Bit Test 16 Bit passed”
32/48 - Returned “Bit Test 16/24 Bit passed” flashed between 16/24
16/96 - Failed
24/96 - Returned “Bit Test 16 Bit passed”
32/96 - Returned “Bit Test 16/24 Bit passed” flashed between 16/24
16/192 - Failed
24/192 - Returned “Bit Test 16 Bit passed”
32/192 - Returned “Bit Test 16/24 Bit passed” flashed between 16/24
16/44 - Failed
16/24 - Returned “Bit Test 16 Bit passed”
16/32 - Returned “Bit Test 16/24 Bit passed” flashed between 16/24
So I'm left scratching my head... The Onkyo HF player on iOS reads, plays and passes all the RME tests. The iOS Music app fails to pass all the 16 bit tests, while the 24 bit tests passed as 16 bit! Same files. Very different results.