Figure 4.

MUSHRA testing interface. Participants ranked eight audio stimuli on a sound quality rating scale from 0 to 100, comparing each to a labeled reference audio clip (top left as “Play Reference”). Each block of eight stimuli was derived from one of 10 songs and included the following, all of which were blind to participants: LowUp, LowDown, MediumUp, MediumDown, HighUp, HighDown, reference, anchor. Audio clips and song blocks were randomized for each participant. Participants were required to rank at least one clip at “0” before proceeding to the next page. Abbreviation: MUSHRA, Multiple Stimuli with Hidden Reference and Anchor.