Only good for very course audio correction not fine tuning
I have a 5.1 surround sound system. Even before receiving this dic it was working pretty well, probably 80% in terms of listening experience. Once you get beyond my surround sound speakers are connected, this disc merely provides "white noise" and frequency sweeps. There is very little to actually help the user know if there system is truly optimized. For example, it would be great if there were audible text overlaid over each frequency point to says something like 20Hz .... 100Hz .... 1kHz ... so that you could know frequency response of your setup and help with phase.. I found that trying to "fine tune" my system setup with disc has been extremely difficult. It's too bad because I was really looking forward to trying it. So ultimately I made no changes to my audio as a result of this disc.
Verified purchase: YesCondition: Pre-owned