Google Nexus devices use Android OS 6+, which is a big problem
Android operating system devices, other than Google Nexus devices, will not be using the latest version of Android. That is the policy of Google; only their signature devices receive the latest Android OS updates. What this means is if you have only Nexus devices (phones or tablets,) you will not be able to use them with your S12EQ, because they are running Android OS 6.0 or 6.1. If I hadn't happened to have a much older non-Google Android phone, running OS 5.0, I would not have been able to run EQ (or even adjust the volume) on my otherwise very impressive ELAC subwoofer. I have brought this issue to the attention of ELAC's Vice President, as well as the developer of the ELAC Sub Control Android app, but have had no response. This Android app was created almost one year ago, and needs to be updated. You can read my comments on the Google Play Store app page for the ELAC Sub Control written over three months ago ... without a response.
By the way, I have had my two ELAC F5s, one C5, and the S12 EQ for over four months now and am very impressed with their overall full high quality sound and smooth integration of the sub. Whether listening to stereo music or 7.1 home theater, I remain very impressed with these speakers and would highly recommend them, as long as you have a device running Android OS 5, not 6. We watched the Blu-ray of the movie San Andreas recently: VERY IMPRESSIVE! You felt the earthquake was happening in your home.