measuring music playback quality

[Marc Schoenwiesner <marcs@xxxxxxxxxxxxxxxxx>]

Dear all,

I am trying to get an overview of different methods that have been  
used to measure the perceived quality of a music recording with the  
goal to evaluate different loudspeakers, playback systems, earplugs,  
etc.
I have seen a number of papers that compare two or more setups by  
asking listeners which recording they prefer. I have not come across a  
measure of absolute quality rather than quality comparisons, for  
instance by asking the (expert) listener to rate the quality of a  
single system. Is anyone aware of such an experiment? (I am  
particularly interested in absence of spectral colouring and  
distortions, but any example will do.)

Best,
Marc

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