Test tracks for low-bitrate codec subjective tests, your suggestions please

[Multicore]

I'm interested in the difference between HE-AAC-v2 and Opus at 32 kbps. Test tracks might be a bit different from those we use to test loudspeakers.

I need to obtain 44.1 kHz uncompressed PCM since that's the input rate in the application.

 

[staticV3]

Over on Hydrogen audio you can find extensive blind tests of lossy Codecs at various bitrates:

Page Redirection

The lossless source tracks used for these tests can be downloaded there as well (Scroll down to "Sample tracks"): https://hydrogenaud.io/index.php/topic,121850.0.html