Shuffling is supposedly "RANDOM" but it's all dependent on your music. You need a nice selection of files in every place to get the best randomness. Like some music files in root with a few artist folders, in each artist folder some music files and some album folders and then some music files in those folders. I find when I make a playlist like that I get the best results.
Yes, we know. Read over the last few pages, people are running into difficulties and then apparently fall off the face of the earth for a few days and then completely ignore what they were doing. I don't have the proper sound card to be able to get good results out of anything, so I am refraining from participating in doing such calculations. Apparently one of the problems is the mono test signal....needs to be stereo. I think that's as far as people got to getting it to work.
Geez, it's not that hard.
- generate "Test Signal" WAV file
- calibrate volume and gain by playing a sine wave at 0 dBFS
- play "Test Signal" WAV file and record the output
- load the recording in RMAA
- repeat as above, but with headphones attached via a splitter cable
- play and record a 1 kHz sine wave at 0 dBFS, note the RMS value (RMS1) of the recording ('sox file.wav -n stat -rms' => "Scaled by rms:")
- same as above, but with headphones of a known impedance attached via a splitter cable, note the RMS value (RMS2) of the recording
- output impedance = (headphone impedance * (RMS1 - RMS2)) / RMS2
- adjust for the input impedance of the recording device: output impedance = 1 / (1 / output impedance - 1 / input impedance)