Popular Post mitchco Posted May 18, 2019 Popular Post Share Posted May 18, 2019 Toole and Olive spent a great deal of R&D effort over years that included controlled subjective listening tests. I wrote a summary of that here, which Sean Olive peer reviewed before it was published: https://audiophilestyle.com/ca/reviews/nad-viso-hp50-with-roomfeel-headphone-review-r720/#science My preference is for a flat, but tilted target response from 20 Hz to -10 dB @ 20 kHz as measured in-room at the listening position. According to Harman’s research, this objectively measured flat, but tilted frequency response, (i.e. spectral balance), is subjectively perceived by our ears as a flat or neutral or accurate response. The deets are in the link above. Another good read is Toole's open access AES paper on The Measurement and Calibration of Sound Reproducing Systems: http://www.aes.org/e-lib/browse.cfm?elib=17839 Check out Fig. 14. Subjectively preferred steady-state room curve targets in a typical domestic listening room and the "trained listeners" preference. Depending on the speakers directivity and how damp/reflective ones room is, there maybe some fine tuning of how much more or less tilt is required by a couple of dB. This is easily accomplished by moving up or down the -10 dB @ 20 kHz point in the target response and then give it a listen and compare. I have tried many targets over the years, including the ones @semente linked above from the ASR forum. The straight line, but tilted target response sounds the most neutral to my ears. I think Toole and Olive's R&D in this area is the most credible, and really the only body of work I know of that uses subjective listening tests to correlate their objective measurements. They have repeated these tests over and over again, with different speakers and listening subjects and end up with virtually the same results each time. The first link above points to the body of work at the end of the article section in presentations, which points to over a dozen AES papers on the subject area. Good luck and have fun! semente and jaaptina 1 1 Accurate Sound Link to comment
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