You can measure the player's contribution to transducer distortions the same way--the Y-split method. It measures the signal exactly as driven through the headphones, with its load affecting the output's accuracy. Use e.g. REW to make a sweep measurement and check both the frequency response and the distortion. Compare, to when the earphones are disconnected. It will be an overestimate of the amount of distortion, unless your line in is really REALLY good, but the comparison with / without earphones connected gives you the rough picture.I see. I have answered to the first your sentence, rather than to the last one. I'm not sure FR (in any form - acoustics one or as output impedance influence on on-load voltage) will describe hearing impressions correctly at the LF area as far as we have transducer distortions rise here. At any case for now after hours of listening I have not found any signs of R3II to have insufficiently low output impedance.
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