![]() However, there was no significant difference between professional sound engineers and sound engineering students ( χ 2 (1.29, p=0.26 n.s.). A chi-square test revealed a significant difference between the results’ distribution amongst the four initial groups of listeners’ expertise: musicians, professional sound engineers, sound engineer students and research scientist ( χ 2 (3)=53.69, p<0.001), indicating a highly significant effect of expertise on preference. Finally, a chi- square test confirmed a significant difference between the results’ distribution for Electric and Acoustic clips ( χ 2 (17.22, p<0.001), so we present the results for Electric and Acoustic clips separately. ![]() Similarly, there was no significant difference between the results’ distribution for contemporary, orchestra and opera excerpts ( χ 2 (2)=4.55, p=0.103 n.s.) so we combined them under Acoustic clips. for pop and metal rock excerpts ( χ (1)=0.06, p=0.81 n.s.) so we combined them under Electric clips. The last part of the questionnaire concerned demographic information, musical training, studio experience and listening habits. Furthermore, we asked if they were familiar with the musical genre of the clip. Participants were also invited to explain, comment or add other useful sound criteria. These criteria were derived from Sutherland’s collected on expert listeners who were asked after the listening test to answer an open question about the sound criteria they used to discriminate the files in CD quality over mp3. For each excerpt, they were provided with a list of seven sound criteria: High frequency artifacts, Reverberation artifacts, Dynamic range, Stereo image, General distortion, Background noise and Transient artifacts. In the second part, we investigated which sound criteria the listeners used to make their decision. ![]() We analyzed these open questions using the constant comparison technique. The first part included two open (free response) questions asking how difficult they found the test and how they describe the differences between two different versions on an excerpt. After the listening test, the participants were asked to fill out a three-part questionnaire. and monitor controller Grace m906 (Grace Design, Boulder, CO, USA), a Classé CA-5200 stereo amplifier (Classé Audio, Lachine, QC, Canada) and B&W 902D loudspeakers (Bowers & Wilkin, Worthing, West Sussex, England).
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