You're not supposed to open the site and enter the redirect target URL into your audio player, but the original URL.
HTML5 Audio will follow redirects on it's own.
This is a very minimal HTML5 Audio page proven to work with my SAM Cloud AAC+ (HEAACv1 128kbps, 44.1 kHz, Stereo) stream in Firefox.
<source src="https://samcloud.spacial.com/api/listen?sid=42879&rid=155385&f=aac,any&br=128000,any&m=sc" type="audio/aacp">
Your browser does not support the audio element.