Recently a member posted a link to an article to headphones.com titled evaluating-sinad-why-its-not-important. This thread was shut down by the mods (I didn't do it but I approved) because these types of threads end up as the usual shit slinging. In the end, no one will change their mind, and there will be little talk about science or where the reality sits. There are a lot of good reasons why SINAD doesn't matter (it matters a little, but not much, and once past a certain point, it really has little correlation to sound quality). The headphones.com author cited masking and audibility thresholds. This is one of them which I have already cited, but in a much simpler way. In retrospect, I do think it's wise to keep repeating SINAD does matter. Perhaps every month I should post one reason why it doesn't matter? Well, for this month, I will make one simple argument: SINAD does not matter because people cannot hear it. By this, I specifically mean that Amir at Audio Science Review cannot hear bad SINAD. Take for instance ASR's glowing review of the JBL LSR305: https://www.audiosciencereview.com/...mkii-and-control-1-pro-monitors-review.10811/ Subjective Listening The JBL 305P Mark ii is a delightful little speaker. It gives a smooth, very realistic sound impression, beating many "hi-fi" ... Review Conclusions It is hard to believe such great performance can be had for so little money in the form of JBL 305P Mark ii. We get it because of research and measurements like I have been showing that resulted in the XXX. So I can definitely recommend the 305P Mark ii. Get a pair so that you can get calibrated on what good sound is like, and correlation between that and the measurements I am showing. Well, all this looks all good and dandy. The LSR305 mark ii does measure decently in frequency response, nevermind that Amir seem to ignore the dip the lower mids to middle mids (the monitor is slightly bright). However, this is the SINAD performance of the cheap plate amp inside the JBL LSR305 mark ii. Here I have used the same criteria that Amir uses in measuring amplifiers. 5W into 4-ohms. Here is the result: JBL 3* plate amp 1kHz 5W into 4-ohms The effective SINAD of this amp worse than 35db. Not only that, the distortion is full of very high odd harmonics. Why did Amir not hear this distortion? So what is this "correlation of this SINAD to sound quality" that Amir speaks of (using Amir's same measurement criteria)? THERE IS NONE: Audio Science Review is basically full of shit. SINAD does mean something, but if means far less than most people think it does. P.S. I've owned several LSR3* series throughout the years and still have a pair. I love them. They are great for what they do for how little they cost.